The following discussion and analysis should be read in conjunction with our
historical Consolidated Financial Statements and related notes included
elsewhere in this Form 10-Q and the Annual Report on Form 10-K filed with the
Securities and Exchange Commission for the year ended December 31, 2019 (the
"Form 10-K"). This discussion contains "forward-looking statements" regarding
our business and industry within the meaning of the Private Securities
Litigation Reform Act of 1995. These statements are based on our current plans
and expectations and involve risks and uncertainties that could cause our actual
future activities and results of operations to be materially different from
those set forth in the forward-looking statements. Important factors that could
cause actual results to differ include risks set forth in "Item 1A. Risk
Factors" included in our Form 10-K. We undertake no obligation to revise or
publicly release the results of any revision to these forward-looking
statements, except as required by law. Given these risks and uncertainties,
readers are cautioned not to place undue reliance on such forward-looking
statements. The terms "Comfort Systems," "we," "us," or the "Company," refer to
Comfort Systems USA, Inc. or Comfort Systems USA, Inc. and its consolidated
subsidiaries, as appropriate in the context.



Introduction and Overview





We are a national provider of comprehensive mechanical and electrical
installation, renovation, maintenance, repair and replacement services within
the mechanical and electrical services industries. We operate primarily in the
commercial, industrial and institutional markets and perform most of our
services within office buildings, retail centers, apartment complexes,
manufacturing plants, and healthcare, education and government facilities. We
operate our business in two business segments: mechanical and electrical.



Nature and Economics of Our Business





In our mechanical business segment, customers hire us to ensure HVAC systems
deliver specified or generally expected heating, cooling, conditioning and
circulation of air in a facility. This entails installing core system equipment
such as packaged heating and air conditioning units, or in the case of larger
facilities, separate core components such as chillers, boilers, air handlers,
and cooling towers. We also typically install connecting and distribution
elements such as piping and ducting.



In our electrical business segment, our principal business activity is electrical construction and engineering in the commercial and industrial field. We also perform electrical logistics services, electrical service work, and electrical construction and engineering services.





In both our mechanical and electrical business segments, our responsibilities
usually require conforming the systems to pre-established engineering drawings
and equipment and performance specifications, which we frequently participate in
establishing. Our project management responsibilities include staging equipment
and materials to project sites, deploying labor to perform the work, and
coordinating with other service providers on the project, including any
subcontractors we might use to deliver our portion of the work.



Approximately 87.2% of our revenue is earned on a project basis for installation
services in newly constructed facilities or for replacement of systems in
existing facilities. When competing for project business, we usually estimate
the costs we will incur on a project, and then propose a bid to the customer
that includes a contract price and other performance and payment terms. Our bid
price and terms are intended to cover our estimated costs on the project and
provide a profit margin to us commensurate with the value of the installed
system to the customer, the risk that project costs or duration will vary from
estimate, the schedule on which we will be paid, the opportunities for other
work that we might forego by committing capacity to this project, and other
costs that we incur to support our operations but which are not specific to the
project. Typically, customers will seek pricing from competitors for a given
project. While the criteria on which customers select a service provider vary
widely and include factors such as quality, technical expertise, on-time
performance, post-project support and service, and company history and financial
strength, we believe that price for value is the most influential factor for
most customers in choosing a mechanical or electrical installation and service
provider.



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After a customer accepts our bid, we generally enter into a contract with the
customer that specifies what we will deliver on the project, what our related
responsibilities are, and how much and when we will be paid. Our overall price
for the project is typically set at a fixed amount in the contract, although
changes in project specifications or work conditions that result in unexpected
additional work are usually subject to additional payment from the customer via
what are commonly known as change orders. Project contracts typically provide
for periodic billings to the customer as we meet progress milestones or incur
cost on the project. Project contracts in our industry also frequently allow for
a small portion of progress billings or contract price to be withheld by the
customer until after we have completed the work. Amounts withheld under this
practice are known as retention or retainage.



Labor and overhead costs account for the majority of our cost of service.
Accordingly, labor management and utilization have the most impact on our
project performance. Given the fixed price nature of much of our project work,
if our initial estimate of project costs is wrong or we incur cost overruns that
cannot be recovered in change orders, we can experience reduced profits or even
significant losses on fixed price project work. We also perform some project
work on a cost-plus or a time and materials basis, under which we are paid our
costs incurred plus an agreed-upon profit margin, and such projects are
sometimes subject to a guaranteed maximum cost. These margins are frequently
less than fixed-price contract margins because there is less risk of
unrecoverable cost overruns in cost-plus or time and materials work.



As of September 30, 2020, we had 6,022 projects in process. Our average project
takes six to nine months to complete, with an average contract price of
approximately $835,000. Our projects generally require working capital funding
of equipment and labor costs. Customer payments on periodic billings generally
do not recover these costs until late in the job. Our average project duration,
together with typical retention terms as discussed above, generally allow us to
complete the realization of revenue and earnings in cash within one year. We
have what we consider to be a well-diversified distribution of revenue across
end-use sectors that we believe reduces our exposure to negative developments in
any given sector. Because of the integral nature of our services to most
buildings, we have the legal right in almost all cases to attach liens to
buildings or related funding sources when we have not been fully paid for
installing systems, except with respect to some government buildings. The
service work that we do, which is discussed further below, usually does not

give
rise to lien rights.



We also perform larger projects. Taken together, projects with contract prices
of $1 million or more totaled $4.4 billion of aggregate contract value as of
September 30, 2020, or approximately 87% of a total contract value for all
projects in progress, totaling $5.0 billion. It is unusual for us to work on a
project that exceeds two years in length.

A stratification of projects in progress as of September 30, 2020, by contract
price, is as follows:




                                           Aggregate
                                           Contract
                              No. of      Price Value
Contract Price of Project    Projects     (millions)
Under $1 million                5,214    $       662.6
$1 million - $5 million           595          1,326.1
$5 million - $10 million          102            740.3
$10 million - $15 million          58            710.1
Greater than $15 million           53          1,588.0
Total                           6,022    $     5,027.1
In addition to project work, approximately 12.8% of our revenue represents
maintenance and repair service on already installed HVAC, electrical, and
controls systems. This kind of work usually takes from a few hours to a few days
to perform. Prices to the customer are based on the equipment and materials used
in the service as well as technician labor time. We usually bill the customer
for service work when it is complete, typically with payment terms of up to
thirty days. We also provide maintenance and repair service under ongoing
contracts. Under these contracts, we are paid regular monthly or quarterly
amounts and provide specified service based on customer requirements. These
agreements typically are for one or more years and frequently contain thirty- to
sixty-day cancellation notice periods.



A relatively small portion of our revenue comes from national and regional account customers. These customers typically have multiple sites and contract with us to perform maintenance and repair service. These contracts may also



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provide for us to perform new or replacement systems installation. We operate a
national call center to dispatch technicians to sites requiring service. We
perform the majority of this work with our own employees, with the balance being
subcontracted to third parties that meet our performance qualifications.



Profile and Management of Our Operations





We manage our 36 operating units based on a variety of factors. Financial
measures we emphasize include profitability and use of capital as indicated by
cash flow and by other measures of working capital principally involving project
cost, billings and receivables. We also monitor selling, general, administrative
and indirect project support expense, backlog, workforce size and mix, growth in
revenue and profits, variation of actual project cost from original estimate,
and overall financial performance in comparison to budget and updated forecasts.
Operational factors we emphasize include project selection, estimating, pricing,
management and execution practices, labor utilization, safety, training, and the
make-up of both existing backlog as well as new business being pursued, in terms
of project size, technical application, facility type, end-use customers and
industries and location of the work.



Most of our operations compete on a local or regional basis. Attracting and
retaining effective operating unit managers is an important factor in our
business, particularly in view of the relative uniqueness of each market and
operation, the importance of relationships with customers and other market
participants, such as architects and consulting engineers, and the high degree
of competition and low barriers to entry in most of our markets. Accordingly, we
devote considerable attention to operating unit management quality, stability,
and contingency planning, including related considerations of compensation and
non-competition protection where applicable.



Economic and Industry Factors


As a mechanical and electrical services provider, we operate in the broader
nonresidential construction services industry and are affected by trends in this
sector. While we do not have operations in all major cities of the United
States, we believe our national presence is sufficiently large that we
experience trends in demand for and pricing of our services that are consistent
with trends in the national nonresidential construction sector. As a result, we
monitor the views of major construction sector forecasters along with
macroeconomic factors they believe drive the sector, including trends in gross
domestic product, interest rates, business investment, employment, demographics
and the fiscal condition of federal, state and local governments.



Spending decisions for building construction, renovation and system replacement
are generally made on a project basis, usually with some degree of discretion as
to when and if projects proceed. With larger amounts of capital, time, and
discretion involved, spending decisions are affected to a significant degree by
uncertainty, particularly concerns about economic and financial conditions and
trends. We have experienced periods of time when economic weakness caused a
significant slowdown in decisions to proceed with installation and replacement
project work.


Operating Environment and Management Emphasis





Nonresidential building construction and renovation activity, as reported by the
federal government, declined steeply over the four-year period from 2009 to
2012, and 2013 and 2014 activity levels were relatively stable at the low levels
of the preceding years. During the five-year period from 2015 to 2019, there was
an increase in overall activity levels.



We have a credit facility in place with terms we believe are favorable that does
not expire until January 2025. As of September 30, 2020, we had $332.9 million
of credit available to borrow under our credit facility. We have strong surety
relationships to support our bonding needs, and we believe our relationships
with the surety markets are strong and benefit from our operating history and
financial position. We have generated positive free cash flow in each of the
last twenty-one calendar years and will continue our emphasis in this area. We
believe that the relative size and strength of our Balance Sheet and surety
relationships, as compared to most companies in our industry, represent
competitive advantages for us.



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As discussed at greater length in "Results of Operations" below, we expect price
competition to continue as our customers and local and regional competitors
compete for customers. We will continue to invest in our service business, to
pursue the more active sectors in our markets, and to emphasize our regional and
national account business.



Cyclicality and Seasonality



Historically, the construction industry has been highly cyclical. As a result,
our volume of business, particularly in new construction projects and
renovation, may be adversely affected by declines in new installation and
replacement projects in various geographic regions of the United States during
periods of economic weakness.



The mechanical and electrical contracting industries are subject to seasonal
variations. The demand for new installation and replacement is generally lower
during the winter months (the first quarter of the year) due to reduced
construction activity during inclement weather and less use of air conditioning
during the colder months. Demand for our services is generally higher in the
second and third calendar quarters due to increased construction activity and
increased use of air conditioning during the warmer months. Accordingly, we
expect our revenue and operating results generally will be lower in the first
calendar quarter.


Results of Operations (dollars in thousands):






                      Three Months Ended September 30,              Nine 

Months Ended September 30,


                         2020                  2019                   2020                    2019
Revenue           $ 714,099    100.0 %  $ 706,918    100.0 %  $ 2,157,698    100.0 %  $ 1,895,693    100.0 %
Cost of
services            566,903     79.4 %    564,216     79.8 %    1,747,714     81.0 %    1,526,310     80.5 %

Gross profit        147,196     20.6 %    142,702     20.2 %      409,984     19.0 %      369,383     19.5 %
Selling,
general and
administrative
expenses             90,888     12.7 %     90,006     12.7 %      268,857     12.5 %      253,417     13.4 %
Gain on sale
of assets             (377)    (0.1) %      (708)    (0.1) %      (1,243)    (0.1) %      (1,119)    (0.1) %
Operating
income               56,685      7.9 %     53,404      7.6 %      142,370      6.6 %      117,085      6.2 %
Interest
income                    7        -           82        -             99        -            174        -
Interest
expense             (1,733)    (0.2) %    (2,779)    (0.4) %      (6,904)    (0.3) %      (6,891)    (0.4) %

Changes in the
fair value of
contingent
earn-out
obligations           3,423      0.5 %    (2,004)    (0.3) %        1,824      0.1 %      (3,924)    (0.2) %
Other income
(expense)              (15)        -            3        -             10        -            167        -
Income before
income taxes         58,367      8.2 %     48,706      6.9 %      137,399      6.4 %      106,611      5.6 %
Provision for
income taxes          8,279                12,473                  30,100                  26,339

Net income $ 50,088 7.0 % $ 36,233 5.1 % $ 107,299

   5.0 %  $    80,272      4.2 %




We had 35 operating locations as of December 31, 2019. In the second quarter of
2020, we completed the acquisition of TAS, which reports as a separate operating
location. As of September 30, 2020, we had 36 operating locations. Acquisitions
are included in our results of operations from the respective acquisition date.
The same-store comparison from 2020 to 2019, as described below, excludes three
months of results for Walker, which was acquired April 1, 2019, eight months of
results for our electrical contractor in North Carolina, which was acquired
February 1, 2020 and reports together with our existing North Carolina operation
and six months of results for TAS, which was acquired on April 1, 2020. An
operating location is included in the same-store comparison on the first day it
has comparable prior year operating data, except for immaterial acquisitions
that were absorbed and integrated, or "tucked-in," with existing operations.
While the electrical contractor in North Carolina is tucked-in with our existing
North Carolina operation, due to the size of the acquired operations, we have
elected to exclude their results from our same-store comparison.

                                       26

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Revenue-Revenue for the third quarter of 2020 increased $7.2 million, or 1.0%,
to $714.1 million compared to the same period in 2019. The increase included a
6.8% increase related to the North Carolina electrical contractor and TAS
acquisitions and a 5.8% decrease in revenue related to same-store activity.



The following table presents our operating segment revenue (in thousands, except
percentages):




                            Three Months Ended September 30,
                              2020                    2019
Revenue:
Mechanical Services    $ 621,140     87.0 %    $ 590,016     83.5 %
Electrical Services       92,959     13.0 %      116,902     16.5 %
Total                  $ 714,099    100.0 %    $ 706,918    100.0 %




Revenue for our mechanical services segment increased $31.1 million, or 5.3%, to
$621.1 million for the third quarter of 2020 compared to the same period in
2019. The increase included the acquisition of TAS in April 2020 ($28.6 million)
as well as an increase in activity in the education sector at one of our
Virginia operations ($14.2 million). This increase was offset by a decrease in
activity in the education sector at our North Carolina operation ($7.0 million)
and in the healthcare sector at one of our Texas operations ($6.1 million).



Revenue for our electrical services segment decreased $23.9 million to $93.0
million for the third quarter of 2020 compared to the same period in 2019. The
decrease related to the impact of Coronavirus Disease 2019 ("COVID-19") as well
as expected decreases driven by a higher volume of large jobs in the prior
period at our Walker operation ($42.3 million). The decrease was partially
offset by the acquisition of the electrical contractor in North Carolina ($19.6
million).



Revenue for the first nine months of 2020 increased $262.0 million, or 13.8%, to
$2.16 billion compared to the same period in 2019. The increase included a 13.5%
increase related to the TAS, North Carolina electrical contractor and Walker
acquisitions and a 0.3% increase in revenue related to same-store activity.



The following table presents our operating segment revenue (in thousands, except
percentages):




                              Nine Months Ended September 30,
                               2020                      2019
Revenue:
Mechanical Services    $ 1,809,304     83.9 %    $ 1,677,632     88.5 %
Electrical Services        348,394     16.1 %        218,061     11.5 %
Total                  $ 2,157,698    100.0 %    $ 1,895,693    100.0 %




Revenue for our mechanical services segment increased $131.7 million, or 7.8%,
to $1.81 billion for the first nine months of 2020 compared to the same period
in 2019. Of this increase, $84.3 million was attributable to the TAS
acquisition. The same-store revenue increase included an increase in activity in
the industrial sector at our North Carolina operation ($16.5 million), in the
education sector at our Arizona operation ($13.6 million) and at one of our
Virginia operations ($13.3 million), and in the government sector at one of our
Tennessee operations ($12.9 million). This increase was offset by the sale of
the majority of the assets and ongoing business of our California operation in
the third quarter of 2019 ($13.8 million).



Revenue for our electrical services segment increased $130.3 million to $348.4
million for the first nine months of 2020 compared to the same period in 2019.
The increase related to the acquisition of Walker in April 2019 as well as the
acquisition of the electrical contractor in North Carolina in February 2020.



Backlog reflects revenue still to be recognized under contracted or committed
installation and replacement project work. Project work generally lasts less
than one year. Service agreement revenue and service work and short duration
projects, which are generally billed as performed, do not flow through backlog.
Accordingly, backlog represents only a portion of our revenue for any given
future period, and it represents revenue that is likely to be reflected in

our

                                       27

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operating results over the next six to twelve months. As a result, we believe
the predictive value of backlog information is limited to indications of general
revenue direction over the near term, and should not be interpreted as
indicative of ongoing revenue performance over several quarters.



The following table presents our operating segment backlog (in thousands, except
percentages):




                           September 30,              December 31,               September 30,
                               2020                       2019                       2019
Backlog:
Mechanical Services    $ 1,226,146      85.8 %    $ 1,348,651      84.2 %    $ 1,312,396      81.6 %
Electrical Services        202,441      14.2 %        253,135      15.8 %  

     296,601      18.4 %
Total                  $ 1,428,587     100.0 %    $ 1,601,786     100.0 %    $ 1,608,997     100.0 %






Backlog as of September 30, 2020 was $1.43 billion, a 6.7% decrease from June
30, 2020 backlog of $1.53 billion, and an 11.2% decrease from September 30, 2019
backlog of $1.61 billion. The sequential backlog decrease was broad-based, and
was primarily as a result of completion of project work at two of our Virginia
operations ($27.2 million), one of our Florida operations ($15.9 million), our
Colorado operation ($10.0 million) and our Wisconsin operation ($8.2 million).
Additionally, we had increased project bookings at one of our Texas operations
($6.8 million). The year-over-year backlog decrease included a same-store
decrease of $271.1 million, or 16.8% partially offset by the TAS acquisition
($40.1 million) and the acquisition of the electrical contractor in North
Carolina ($50.6 million). Same-store year-over-year backlog decreased primarily
due to completion of project work at Walker ($141.7 million), our North Carolina
operation ($37.5 million), one of our Texas operations ($28.8 million) and our
Arizona operation ($21.7 million). Additionally, we had increased project
bookings at one of our Indiana operations ($22.4 million).



Gross Profit-Gross profit increased $4.5 million, or 3.1%, to $147.2 million for
the third quarter of 2020 as compared to the same period in 2019. The increase
included a 2.1% increase related to the TAS and North Carolina electrical
contractor acquisitions and a 1.0% increase in same-store activity. The
same-store increase in gross profit was primarily due to improvements in project
execution at one of our Indiana operations ($5.3 million) and one of our
Tennessee operations ($2.9 million), partially offset by a decrease at our
Arkansas operation ($2.5 million) compared to the prior year. Additionally, we
had increased volumes at one of our Virginia operations ($4.2 million), offset
by a decrease in volumes at Walker ($7.4 million). As a percentage of revenue,
gross profit for the third quarter increased from 20.2% in 2019 to 20.6% in 2020
primarily due to a broad-based improvement in project execution, as discussed
above.



Gross profit increased $40.6 million, or 11.0%, to $410.0 million for the first
nine months of 2020 as compared to the same period in 2019. The increase
included a 4.9% increase related to the TAS, North Carolina electrical
contractor and Walker acquisitions and a 6.1% increase in same-store activity.
The same-store increase in gross profit was primarily due to improvements in
project execution at our North Carolina operation ($14.9 million) and one of our
Indiana operations ($7.0 million), partially offset by a decrease at one of our
Florida operations ($7.0 million) compared to the prior year. Additionally, we
had increased volumes at one of our Virginia operations ($3.2 million). As a
percentage of revenue, gross profit for the nine-month period decreased from
19.5% in 2019 to 19.0% in 2020 primarily due to the factors discussed above and
lower margins on the Walker acquisition, which was acquired in April 2019.
Additionally, preventative and protective actions taken on projects, such as the
social distancing and other procedure adjustments caused by COVID-19, negatively
impacted margins starting in March 2020.



Selling, General and Administrative Expenses ("SG&A")-SG&A increased
$0.9 million, or 1.0%, to $90.9 million for the third quarter of 2020 as
compared to 2019. On a same-store basis, excluding amortization expense, SG&A
decreased $3.8 million, or 4.5%. This decrease is primarily due to the reduction
in same-store revenue for the period, as well as reductions in travel-related
expenses ($1.2 million) as a result of COVID-19 and lower bad debt expense of
$0.6 million in the third quarter of 2020. These decreases were partially offset
by increases in tax consulting fees in the third quarter of 2020 which totaled
$2.8 million, as compared to $0.9 million in the same period in 2019.
Amortization expense increased $0.8 million during the period, primarily as a
result of the TAS and North Carolina electrical contractor acquisitions. As a
percentage of revenue, SG&A for the third quarter remained steady at 12.7%

in
both 2019 and 2020.

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SG&A increased $15.4 million, or 6.1%, to $268.9 million for the first nine
months of 2020 as compared to 2019. On a same-store basis, excluding
amortization expense, SG&A decreased $3.3 million, or 1.4%. This decrease is
primarily due to the sale of the majority of the assets and ongoing business of
our California operation in the third quarter of 2019 ($5.0 million) as well as
due to a reduction in travel-related expenses as a result of COVID-19 ($2.8
million). These decreases were partially offset by an increase in bad debt
expense of $2.3 million, mainly driven by concerns about collectability of
certain receivables due to the business interruptions caused by COVID-19,
specifically with respect to receivables with retail, restaurants and
entertainment companies. Furthermore, tax consulting fees increased from $1.3
million in the first nine months of 2019 to $2.8 million in the same period in
2020. Amortization expense increased $3.0 million during the period, primarily
as a result of the Walker, TAS and North Carolina electrical contractor
acquisitions. As a percentage of revenue, SG&A for the nine-month period
decreased from 13.4% in 2019 to 12.5% in 2020 due to the factors discussed above
and due to the acquisition of Walker, which has lower SG&A as a percentage

of
revenue.



We have included same-store SG&A, excluding amortization, because we believe it
is an effective measure of comparative results of operations. However,
same-store SG&A, excluding amortization, is not considered under generally
accepted accounting principles to be a primary measure of an entity's financial
results, and accordingly, should not be considered an alternative to SG&A as
shown in our consolidated statements of operations.




                                         Three Months Ended         Nine Months Ended
                                           September 30,              September 30,
                                         2020         2019          2020          2019

                                           (in thousands)             (in thousands)
SG&A                                   $  90,888    $  90,006    $  268,857    $  253,417

Less: SG&A from companies acquired       (3,813)            -      (15,730)

            -
Less: Amortization expense               (6,889)      (6,065)      (19,596)      (16,575)
Same-store SG&A, excluding
amortization expense                   $  80,186    $  83,941    $  233,531    $  236,842




Interest Expense-Interest expense decreased $1.0 million, or 37.6%, to
$1.7 million for the third quarter of 2020 as compared to the same period in
2019. The decrease in interest expense is due to a reduction in our average
interest rate on our outstanding borrowings in the third quarter of 2020
compared to the prior year. Interest expense remained steady at $6.9 million for
the first nine months of both 2020 and 2019. Increases in borrowings on the
senior credit facility and notes to former owners for our recent acquisitions,
including TAS, were offset by a reduction in our average interest rate on
outstanding borrowings for the first nine months of 2020 as compared to 2019.



Changes in the Fair Value of Contingent Earn-out Obligations-The contingent
earn-out obligations are measured at fair value each reporting period, and
changes in estimates of fair value are recognized in earnings. Income from
changes in the fair value of contingent earn-out obligations for the third
quarter of 2020 increased $5.4 million as compared to the same period in 2019.
Income from changes in the fair value of contingent earn-out obligations for the
first nine months of 2020 increased $5.7 million as compared to the same period
in 2019. The increases were caused by higher expenses in the prior year as a
result of increasing our obligation for the BCH acquisition as earnings exceeded
forecast in the prior year as well as a reduction in our obligation for Walker
in the current year caused by project delays, the impact of COVID-19 and lower
than forecasted earnings in the current quarter.

Provision for Income Taxes-Our provision for income taxes for the nine months
ended September 30, 2020 was $30.1 million with an effective tax rate of 21.9%
as compared to a provision for income taxes of $26.3 million with an effective
tax rate of 24.7% for the same period in 2019. The effective tax rate for 2020
was higher than the 21% federal statutory rate primarily due to net state income
taxes (4.8%) and nondeductible expenses, including nondeductible expenses
related to TAS (2.2%), partially offset by a decrease in unrecognized tax
benefits as a result of settlement with the Internal Revenue Service (the "IRS")
upon completion of its examination of our amended federal returns for 2014 and
2015 (6.0%). The effective tax rate for 2019 was higher than the 21% federal
statutory rate primarily due to net state income taxes (4.4%) and nondeductible
expenses (1.7%) partially offset by benefits from the filing, and expected
filing, of amended returns to claim the energy efficient commercial buildings
deduction (the "179D deduction") allocated to us (1.9%) and deductions for
stock-based compensation (0.4%).



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We currently estimate our effective tax rate for the full year 2020 will be
between 22% and 25%, which includes the tax benefits from the IRS settlement of
2014 and 2015 tax years. Starting in 2021, we expect our effective tax rate will
be between 25% and 30%, as we cannot reasonably estimate the tax benefits from
the credit for increasing research activities (the "R&D tax credit") or 179D
deduction at this time.



Outlook



Industry conditions improved during the four-year period from 2016 to 2019, and
at the beginning of 2020 we expected this strong activity to continue during the
current year. However, starting at the end of the first quarter of this year, we
experienced negative impacts to our business due to the business disruption
caused by COVID-19. In March 2020, the World Health Organization categorized
COVID-19 as a pandemic, and the United States declared the COVID-19 outbreak a
national emergency.



Our service business experienced the first and most pronounced negative impacts,
largely because of building closures or decisions by customers to limit building
access. As of the end of the third quarter, the majority of our service
operations had returned to levels that are at or near normal functioning. Our
construction activities have generally been classified as essential services in
the substantial majority of our markets, although we have had certain jobs
temporarily or partially close due to government action, decisions by owners, or
upon positive tests for COVID-19 of workers at various sites. We have
experienced delays in the award of new construction work in certain instances,
and we have also experienced limited instances of delayed starts. Additionally,
we have had some delays or cancellations of work in less than 5% of our backlog.
Across our operations we have implemented safety precautions and other COVID-19
related guidelines that have added cost or inefficiency as we work to create a
safe environment for our team members and our communities. The Company
considered the ongoing impact of COVID-19 on the assumptions and estimates used
to determine our results and asset valuations as of September 30, 2020 and
determined that there were no material or systematic adverse impacts on the
Company's third quarter except for diminished revenue, operational inefficiency,
and adjustments in bad debt expense due to the potential for nonpayment by
customers in industries more directly impacted by COVID-19.



At this time, it is impossible to quantify the impact of COVID-19 in the
upcoming quarters because we do not know how the pandemic and related
governmental decisions will unfold, nor how the pandemic may impact decisions of
our customers. The impact of COVID-19 creates more uncertainty than usual in our
business outlook, and we currently expect that in some markets we will
experience additional delays in the award or commencement of a portion of our
projects that is likely to impact activity levels in the coming quarters and
particularly during the first half of 2021. Nevertheless, assuming COVID-19 does
not materially worsen, we expect that that we will continue to achieve
substantial positive earnings and cash flow in the fourth quarter of 2020 and in
2021, and we continue to prepare for a wide range of economic circumstances.



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Liquidity and Capital Resources (in thousands):






                                                            Nine Months Ended
                                                              September 30,
                                                           2020           2019

Cash provided by (used in):
Operating activities                                    $   216,400    $    99,715
Investing activities                                      (130,514)      (216,053)
Financing activities                                       (66,134)        111,081

Net increase (decrease) in cash and cash equivalents    $    19,752    $   (5,257)
Free cash flow:
Cash provided by operating activities                   $   216,400    $   

99,715


Purchases of property and equipment                        (19,459)       

(22,641)


Proceeds from sales of property and equipment                 1,890        

 1,447
Free cash flow                                          $   198,831    $    78,521




Cash Flow



Our business does not require significant amounts of investment in long-term
fixed assets. The substantial majority of the capital used in our business is
working capital that funds our costs of labor and installed equipment deployed
in project work until our customer pays us. Customary terms in our industry
allow customers to withhold a small portion of the contract price until after we
have completed the work, typically for six months. Amounts withheld under this
practice are known as retention or retainage. Our average project duration,
together with typical retention terms, generally allow us to complete the
realization of revenue and earnings in cash within one year.



Cash Provided by Operating Activities-Cash flow from operations is primarily
influenced by demand for our services and operating margins but can also be
influenced by working capital needs associated with the various types of
services that we provide. In particular, working capital needs may increase when
we commence large volumes of work under circumstances where project costs,
primarily associated with labor, equipment and subcontractors, are required to
be paid before the receivables resulting from the work performed are billed and
collected. Working capital needs are generally higher during the late winter and
spring months as we prepare and plan for the increased project demand when
favorable weather conditions exist in the summer and fall months. Conversely,
working capital assets are typically converted to cash during the late summer
and fall months as project completion is underway. These seasonal trends are
sometimes offset by changes in the timing of major projects, which can be
impacted by the weather, project delays or accelerations and other economic
factors that may affect customer spending.



Cash provided by operating activities was $216.4 million during the first nine
months of 2020 compared with $99.7 million during the same period in 2019. This
increase was primarily driven by a $65.0 million change in receivables, net
driven by strong collections in the current year, an $18.0 million change in
other long-term liabilities, a $14.0 million change in prepaid expenses and
other current assets and an $8.9 million change in billings in excess of costs,
which was driven by timing of payments and project billings. Operating cash
flows in the current year benefited by approximately $20.9 million from the
deferral of payroll taxes allowed by the Coronavirus Aid, Relief, and Economic
Security Act ("CARES Act") that normally would have been paid by September

30,
2020.



Cash Used in Investing Activities-During the first nine months of 2020, cash
used in investing activities was $130.5 million compared to $216.1 million
during the same period in 2019. The $85.6 million decrease in cash used
primarily relates to cash paid (net of cash acquired) for acquisitions in 2020
compared to the same period in 2019.



Cash Provided by (Used in) Financing Activities-Cash used in financing
activities was $66.1 million for the first nine months of 2020 compared to cash
provided by financing activities of $111.1 million during the same period in
2019. The $177.2 million decrease in cash provided by financing activities is
primarily due to a decrease in net proceeds from the debt compared to the prior
year, which was driven by stronger operating cash flows in the current year that
allowed us to pay down more debt.



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Free Cash Flow-We define free cash flow as cash provided by operating
activities, less customary capital expenditures, plus the proceeds from asset
sales. We believe free cash flow, by encompassing both profit margins and the
use of working capital over our approximately one year working capital cycle, is
an effective measure of operating effectiveness and efficiency. We have included
free cash flow information here for this reason, and because we are often asked
about it by third parties evaluating us. However, free cash flow is not
considered under generally accepted accounting principles to be a primary
measure of an entity's financial results, and accordingly free cash flow should
not be considered an alternative to operating income, net income, or amounts
shown in our consolidated statements of cash flows as determined under generally
accepted accounting principles. Free cash flow may be defined differently by
other companies.



Share Repurchase Program



On March 29, 2007, our Board of Directors (the "Board") approved a stock
repurchase program to acquire up to 1.0 million shares of our outstanding common
stock. Subsequently, the Board has from time to time increased the number of
shares that may be acquired under the program and approved extensions of the
program. On November 19, 2019, the Board approved an extension to the program by
increasing the shares authorized for repurchase by 0.8 million shares. Since the
inception of the repurchase program, the Board has approved 9.5 million shares
to be repurchased. As of September 30, 2020, we have repurchased a cumulative
total of 9.1 million shares at an average price of $18.89 per share under the
repurchase program.



The share repurchases will be made from time to time at our discretion in the
open market or privately negotiated transactions as permitted by securities laws
and other legal requirements, and subject to market conditions and other
factors. In an exercise of such discretion, we suspended share repurchases from
March 27, 2020 to May 26, 2020 in response to the uncertainty surrounding the
current COVID-19 pandemic, as more fully described in "Item 1A. Risk Factors"
herein. The Board may modify, suspend, extend or terminate the program at any
time. During the nine months ended September 30, 2020, we repurchased
0.4 million shares for approximately $18.8 million at an average price of $41.90
per share.



Debt


Revolving Credit Facility and Term Loan





We have a $600.0 million senior credit facility (the "Facility") provided by a
syndicate of banks. The Facility is composed of a revolving credit line in the
amount of $450.0 million and a $150.0 million term loan, and the Facility
provides for a $150.0 million accordion or increase option for the revolving
portion of the Facility. The Facility also includes a sublimit of up to $160.0
million issuable in the form of letters of credit. The Facility expires in
January 2025 and is secured by a first lien on substantially all of our personal
property except for assets related to projects subject to surety bonds and
assets held by certain unrestricted subsidiaries and our wholly owned captive
insurance company and a second lien on our assets related to projects subject to
surety bonds. In 2019, we incurred approximately $1.4 million in financing and
professional costs in connection with an amendment to the Facility, which are
being amortized over the remaining term of the Facility. Of this amount, $0.4
million is attributable to the term loan and is being amortized using the
effective interest method. The remaining $1.0 million is attributable to the
revolving credit line, which combined with the previous unamortized costs of
$1.3 million, is being amortized over the remaining term of the Facility on a
straight-line basis as a non-cash charge to interest expense. For the term loan,
we are required to make quarterly payments increasing over time from 1.25% to
3.75% of the original aggregate principal amount of the term loan, with the
balance due in January 2025. As of September 30, 2020, we had $61.5 million of
outstanding borrowings on the revolving credit facility, $55.6 million in
letters of credit outstanding and $332.9 million of credit available.



There are two interest rate options for borrowings under the Facility, the Base
Rate Loan option and the Eurodollar Rate Loan option. These rates are floating
rates determined by the broad financial markets, meaning they can and do move up
and down from time to time. Additional margins are then added to these two
rates.



Certain of our vendors require letters of credit to ensure reimbursement for
amounts they are disbursing on our behalf, such as to beneficiaries under our
self-funded insurance programs. We have also occasionally used letters of credit
to guarantee performance under our contracts and to ensure payment to our
subcontractors and vendors under

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those contracts. Our lenders issue such letters of credit through the Facility
for a fee. We have never had a claim made against a letter of credit that
resulted in payments by a lender or by us and believe such claims are unlikely
in the foreseeable future. The letter of credit fees range from 1.25% to 2.00%
per annum, based on the ratio of Consolidated Total Indebtedness to "Credit
Facility Adjusted EBITDA," which shall mean Consolidated EBITDA as such term is
defined in the credit agreement.



Commitment fees are payable on the portion of the revolving loan capacity not in
use for borrowings or letters of credit at any given time. These fees range from
0.20% to 0.35% per annum, based on the ratio of Consolidated Total Indebtedness
to Credit Facility Adjusted EBITDA.



The Facility contains financial covenants defining various financial measures
and the levels of these measures with which we must comply. Covenant compliance
is assessed as of each quarter end.



The Facility's principal financial covenants include:





Total Leverage Ratio-The Facility requires that the ratio of our Consolidated
Total Indebtedness to our Credit Facility Adjusted EBITDA not exceed 3.00 to
1.00 as of the end of each fiscal quarter. The total leverage ratio as of
September 30, 2020 was 0.8.



Fixed Charge Coverage Ratio-The Facility requires that the ratio of (a) Credit
Facility Adjusted EBITDA, less non-financed capital expenditures, provision for
income taxes, dividends, and amounts used to repurchase stock when the Company's
Total Leverage Ratio exceeds 2.00 to 1.00, to (b) the sum of interest expense
and scheduled principal payments of indebtedness be at least 1.50 to 1.00.
Credit Facility Adjusted EBITDA, capital expenditures, provision for income
taxes, dividends, stock repurchase payments, interest expense, and scheduled
principal payments are defined under the Facility for purposes of this covenant,
to be amounts for the four quarters ending as of any given quarterly covenant
compliance measurement date. The fixed charge coverage ratio as of September 30,
2020 was 6.6.



Other Restrictions-The Facility permits acquisitions of up to $5.0 million per
transaction, provided that the aggregate purchase price of such an acquisition
and of acquisitions in the same fiscal year does not exceed $10.0 million.
However, these limitations only apply when the Company's Total Leverage Ratio is
greater than 2.50 to 1.00.



While the Facility's financial covenants do not specifically govern capacity
under the Facility, if our debt level under the Facility at a quarter-end
covenant compliance measurement date were to cause us to violate the Facility's
leverage ratio covenant, our borrowing capacity under the Facility and the
favorable terms that we currently have could be negatively impacted by the
lenders.



We were in compliance with all of our financial covenants as of September 30, 2020.





Notes to Former Owners



As part of the consideration used to acquire four companies, we have outstanding
notes to the former owners. These notes had an outstanding balance of $26.1
million as of September 30, 2020. In conjunction with the acquisition of TAS in
the second quarter of 2020, we issued a promissory note to former owners with an
outstanding balance of $8.0 million as of September 30, 2020 that bears
interest, payable quarterly, at a stated interest rate of 3.5%. The principal is
due in April 2022. In conjunction with the acquisition of the electrical
contractor in North Carolina in the first quarter of 2020, we issued a
promissory note to former owners with an outstanding balance of $8.0 million as
of September 30, 2020 that bears interest, payable quarterly, at a stated
interest rate of 3.0%. The principal is due in equal installments in February
2023 and February 2024. In conjunction with the Walker acquisition in the second
quarter of 2019, we issued a promissory note to former owners with an
outstanding balance of $10.0 million as of September 30, 2020 that bears
interest, payable quarterly, at a stated interest rate of 4.0%. The principal is
due in April 2023. In conjunction with one immaterial acquisition in 2019, we
issued a note to former owners with an outstanding balance of $0.1 million as of
September 30, 2020 that bears interest, payable quarterly, at a stated interest
rate of 3.0%. The principal is due in January 2021.



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Outlook



We have generated positive net free cash flow for the last twenty-one calendar
years, much of which occurred during challenging economic and industry
conditions. We also continue to have significant borrowing capacity under our
credit facility, and we maintain what we feel are reasonable cash balances. We
believe these factors will provide us with sufficient liquidity to fund our
operations for the foreseeable future.



Off-Balance Sheet Arrangements and Other Commitments





Certain of our vendors require letters of credit to ensure reimbursement for
amounts they are disbursing on our behalf, such as to beneficiaries under our
self-funded insurance programs. We have also occasionally used letters of credit
to guarantee performance under our contracts and to ensure payment to our
subcontractors and vendors under those contracts. The letters of credit we
provide are actually issued by our lenders through the Facility as described
above. A letter of credit commits the lenders to pay specified amounts to the
holder of the letter of credit if the holder demonstrates that we have failed to
perform specified actions. If this were to occur, we would be required to
reimburse the lenders. Depending on the circumstances of such a reimbursement,
we may also have to record a charge to earnings for the reimbursement. Absent a
claim, there is no payment or reserving of funds by us in connection with a
letter of credit. However, because a claim on a letter of credit would require
immediate reimbursement by us to our lenders, letters of credit are treated as a
use of the Facility's capacity just the same as actual borrowings. Claims
against letters of credit are rare in our industry. To date, we have not had a
claim made against a letter of credit that resulted in payments by a lender or
by us. We believe that it is unlikely that we will have to fund claims under a
letter of credit in the foreseeable future.



Many customers, particularly in connection with new construction, require us to
post performance and payment bonds issued by a financial institution known as a
surety. If we fail to perform under the terms of a contract or to pay
subcontractors and vendors who provided goods or services under a contract, the
customer may demand that the surety make payments or provide services under the
bond. We must reimburse the sureties for any expenses or outlays they incur. To
date, we are not aware of any losses to our sureties in connection with bonds
the sureties have posted on our behalf, and we do not expect such losses to be
incurred in the foreseeable future.



Under standard terms in the surety market, sureties issue bonds on a
project-by-project basis, and can decline to issue bonds at any time.
Historically, approximately 15% to 25% of our business has required bonds. While
we currently have strong surety relationships to support our bonding needs,
future market conditions or changes in our sureties' assessment of our operating
and financial risk could cause our sureties to decline to issue bonds for our
work. If that were to occur, our alternatives include doing more business that
does not require bonds, posting other forms of collateral for project
performance, such as letters of credit or cash, and seeking bonding capacity
from other sureties. We would likely also encounter concerns from customers,
suppliers and other market participants as to our creditworthiness. While we
believe our general operating and financial characteristics would enable us to
ultimately respond effectively to an interruption in the availability of bonding
capacity, such an interruption would likely cause our revenue and profits to
decline in the near term.



Contractual Obligations



As of September 30, 2020, we have $55.6 million in letter of credit commitments,
of which $14.8 million will expire in 2020 and $40.8 million will expire in
2021. The substantial majority of these letters of credit are posted with
insurers who disburse funds on our behalf in connection with our workers'
compensation, auto liability and general liability insurance program. These
letters of credit provide additional security to the insurers that sufficient
financial resources will be available to fund claims on our behalf, many of
which develop over long periods of time, should we ever encounter financial
duress. Posting of letters of credit for this purpose is a common practice for
entities that manage their self-insurance programs through third-party insurers
as we do. While many of these letter of credit commitments expire in the next
twelve months, we expect nearly all of them, particularly those supporting our
insurance programs, will be renewed annually.





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