Limited Power of Attorney for Section 16 Reporting Obligations

The undersigned hereby makes, constitutes, and appoints Laura F.
Howell and Rachel J. Reagor, each acting individually, as the
undersigned's true and lawful attorney-in-fact, with full power
and authority as hereinafter described on behalf of and in the
name, place, and stead of the undersigned to:

     1)prepare, execute, acknowledge, deliver, and file Forms 3,
4, and 5 (including any amendments thereto) with respect to the
securities of Comfort Systems USA, Inc., a Delaware corporation
(the "Company"), with the United States Securities and Exchange
Commission, any national securities exchanges, and the Company,
as considered necessary or advisable under Section 16(a) of the
Securities Exchange Act of 1934 and the rules and regulations
promulgated thereunder, as amended from time to time (the
"Exchange Act");

     2)seek or obtain, as the undersigned's representative and on
the undersigned's behalf, information on transactions in the
Company's securities from any third party, including brokers,
employee benefit plan administrators, and trustees, and the
undersigned hereby authorizes any such person to release any such
information to the attorney-in-fact and approves and ratifies any
such release of information; and
     3)perform any and all other acts that, in the discretion of
such attorney-in-fact, are necessary or desirable for and on
behalf of the undersigned in connection with the foregoing.

The undersigned acknowledges that:

     1)this Power of Attorney authorizes, but does not require,
such attorney-in-fact to act in his or her discretion on
information provided to such attorney-in-fact without independent
verification of such information;

     2)any documents prepared and/or executed by such attorney-
in-fact on behalf of the undersigned pursuant to this Power of
Attorney will be in such form and will contain such information
and disclosure as such attorney-in-fact, in his or her
discretion, deems necessary or desirable;

     3)neither the Company nor such attorney-in-fact assumes (i)
any liability for the undersigned's responsibility to comply with
the requirement of the Exchange Act, (ii) any liability of the
undersigned for any failure to comply with such requirements, or
(iii) any obligation or liability of the undersigned for profit
disgorgement under Section 16(b) of the Exchange Act; and

     4)this Power of Attorney does not relieve the undersigned
from responsibility for compliance with the undersigned's
obligations under the Exchange Act, including without limitation
the reporting requirements under Section 16 of the Exchange Act.
The undersigned hereby gives and grants the foregoing attorney-
in-fact full power and authority to do and perform all and every
act and thing whatsoever requisite, necessary, or appropriate to
be done in and about the foregoing matters as fully to all
intents and purposes as the undersigned might or could do if
present, hereby ratifying all that such attorney-in-fact of, for,
or on behalf of the undersigned, shall lawfully do or cause to be
done by virtue of this Limited Power of Attorney.

This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4,
and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier
revoked by the undersigned in a signed writing delivered to the
foregoing attorney-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed in Harris County, Texas as of this 6th
date of March, 2019.

/s/ Brian E. Lane_______________________
Brian E. Lane