Comfort USA : 2021 Proxy Card

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COMFORT SYSTEMS USA, INC.

ANNUAL MEETING OF STOCKHOLDERS

Solicited by the Board of Directors of Comfort Systems USA, Inc.

The undersigned hereby appoints Brian E. Lane and Laura F. Howell, and each of them individually, as proxies with full power of substitution, to vote, as designated on the reverse, all shares of Common Stock of Comfort Systems USA, Inc. that the undersigned is entitled to vote at the Annual Meeting of Stockholders thereof to be held on May 18, 2021, or at any adjournment or postponement thereof.

ALL SHARES WILL BE VOTED AS DIRECTED HEREIN. IF NO SUCH DIRECTION IS GIVEN, THIS PROXY WILL BE VOTED IN ACCORDANCE WITH THE BOARD OF DIRECTORS' RECOMMENDATIONS.

(Continued and to be signed on the reverse side)

1.1

14475

PLEASE COMPLETE, SIGN AND PROMPTLY MAIL IN THE ENCLOSED ENVELOPE.

ANNUAL MEETING OF STOCKHOLDERS OF

COMFORT SYSTEMS USA, INC.

May 18, 2021

GO GREEN

e-Consent makes it easy to go paperless. With e-Consent, you can quickly access your proxy material, statements and other eligible documents online, while reducing costs, clutter and paper waste. Enroll today via www.astfinancial.com to enjoy online access.

NOTICE OF INTERNET AVAILABILITY OF PROXY MATERIAL:

The notice of meeting, proxy statement and proxy card are available at http://proxy2021.comfortsystemsusa.com

Please sign, date and mail

your proxy card in the

envelope provided as soon

as possible.

Please detach along perforated line and mail in the envelope provided.
21030300000000000000	4	051821

		THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR ALL NOMINEES" ON PROPOSAL 1, A VOTE "FOR" PROPOSAL 2 AND A VOTE "FOR" PROPOSAL 3.
		PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE x
	1. ELECTION OF TEN DIRECTORS FOR TERMS EXPIRING AT THE	2. RATIFICATION OF APPOINTMENT OF DELOITTE & TOUCHE	FOR AGAINST ABSTAIN
	2022 ANNUAL MEETING;
				LLP AS INDEPENDENT REGISTERED PUBLIC ACCOUNT-
		FOR ALL NOMINEES	NOMINEES:	ING FIRM FOR 2021.
		O Darcy G. Anderson
			O Herman E. Bulls
		WITHHOLD AUTHORITY	O Alan P. Krusi	3. ADVISORY VOTE TO APPROVE THE COMPENSATION
		FOR ALL NOMINEES	O Brian E. Lane	OF THE NAMED EXECUTIVE OFFICERS.
			O Pablo G. Mercado
		FOR ALL EXCEPT	O Franklin Myers
		(See instructions below)	O William J. Sandbrook	You hereby revoke all previous proxies given. You may revoke this proxy at any
			O Constance E. Skidmore	time prior to a vote thereon. Receipt of the accompanying proxy statement and
			O Vance W. Tang	the Annual Report of Comfort Systems USA, Inc., which includes the Annual
			O Cindy L. Wallis-Lage	Report on Form 10-K for the fiscal year ended December 31, 2020, is hereby
				acknowledged.

INSTRUCTIONS:To withhold authority to vote for any individual nominee(s) mark "FOR ALL EXCEPT" and fill in the circle next to each nominee you wish to withhold, as shown here:

To change the address on your account please check the box at right and indicate your new address in the address space above. Please note that changes to the registered name(s) on the account may not be submitted via this method.

Signature of Stockholder

Date:

Signature of Stockholder

Date:

Note:

Please sign exactly as your name or names appear on this proxy. When shares are held jointly, each

holder should sign. When

signing as executor, administrator, attorney, trustee or

guardian,

please give full

title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person.

PLEASE COMPLETE, SIGN AND PROMPTLY MAIL IN THE ENCLOSED ENVELOPE.

ANNUAL MEETING OF STOCKHOLDERS OF

COMFORT SYSTEMS USA, INC.

May 18, 2021

INTERNET- Access "www.voteproxy.com

PROXY VOTING INSTRUCTIONS

" and follow the on-screen

instructions or scan the QR code with your smartphone. Have your

proxy card available when you access the web page.

TELEPHONE- Call toll-free

1-800-PROXIES (1-800-776-9437) in

the United States or 1-718-921-8500 from foreign countries from any

touch-tone telephone and follow the instructions. Have your proxy

card available when you call.

Vote online/phone until 11:59 PM EST the day before the meeting.

COMPANY NUMBER

MAIL- Sign, date and mail your proxy card in the envelope

provided as soon as possible.

IN PERSON- You may vote your shares in person by attending

ACCOUNT NUMBER

the Annual Meeting.

GO GREEN- e-Consent makes it easy to go paperless. With

e-Consent, you can quickly access your proxy material, statements

and other eligible documents online, while reducing costs, clutter

and paper waste. Enroll today via www.astfinancial.com to enjoy

online access.

NOTICE OF INTERNET AVAILABILITY OF PROXY MATERIAL:

The notice of meeting, proxy statement and proxy card

are available at http://proxy2021.comfortsystemsusa.com

Please detach along perforated line and mail in the envelope provided IFyou are not voting via telephone or the Internet.

21030300000000000000

4

051821

		THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR ALL NOMINEES" ON PROPOSAL 1, A VOTE "FOR" PROPOSAL 2 AND A VOTE "FOR" PROPOSAL 3.
		PLEASE SIGN, DATE AND RETURN PROMPTLY IN THE ENCLOSED ENVELOPE. PLEASE MARK YOUR VOTE IN BLUE OR BLACK INK AS SHOWN HERE x
	1. ELECTION OF TEN DIRECTORS FOR TERMS EXPIRING AT THE	2. RATIFICATION OF APPOINTMENT OF DELOITTE & TOUCHE	FOR AGAINST ABSTAIN
	2022 ANNUAL MEETING;
				LLP AS INDEPENDENT REGISTERED PUBLIC ACCOUNT-
		FOR ALL NOMINEES	NOMINEES:	ING FIRM FOR 2021.
		O Darcy G. Anderson
			O Herman E. Bulls
		WITHHOLD AUTHORITY	O Alan P. Krusi	3. ADVISORY VOTE TO APPROVE THE COMPENSATION
		FOR ALL NOMINEES	O Brian E. Lane	OF THE NAMED EXECUTIVE OFFICERS.
			O Pablo G. Mercado
		FOR ALL EXCEPT	O Franklin Myers
		(See instructions below)	O William J. Sandbrook	You hereby revoke all previous proxies given. You may revoke this proxy at any
			O Constance E. Skidmore	time prior to a vote thereon. Receipt of the accompanying proxy statement and
			O Vance W. Tang	the Annual Report of Comfort Systems USA, Inc., which includes the Annual
			O Cindy L. Wallis-Lage	Report on Form 10-K for the fiscal year ended December 31, 2020, is hereby
				acknowledged.

INSTRUCTIONS:To withhold authority to vote for any individual nominee(s) mark "FOR ALL EXCEPT" and fill in the circle next to each nominee you wish to withhold, as shown here:

To change the address on your account please check the box at right and indicate your new address in the address space above. Please note that changes to the registered name(s) on the account may not be submitted via this method.

Signature of Stockholder		Date:		Signature of Stockholder		Date:
	Note:	Please sign	exactly as your name or names appear on this proxy. When shares are held jointly, each holder should sign. When signing as executor, administrator, attorney, trustee or guardian, please give
		full title as such. If the signer is a corporation, please sign full corporate name by duly authorized officer, giving full title as such. If signer is a partnership, please sign in partnership name by authorized person.