COMFORT SYSTEMS USA INC — Director's Dealing 2021

May 6, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COMFORT SYSTEMS USA INC (FIX)
CIK: 0001035983
Period of Report: 2021-05-04

Reporting Person: Lane Brian E. (Director, President/Chief Executive Off.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-04	Common Stock	M	25988	$36.25	Acquired	290183	Direct
2021-05-05	Common Stock	S	25988	$84.9052	Disposed	264195	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-04	Option to Buy	$36.25	M	25988	Disposed	2027-03-08	Common Stock (25988)	Direct

Footnotes

F1: Represents the average price of shares sold; full information regarding the number of shares sold and specific prices will be made available upon request to the Company's Office of the General Counsel.

F2: Stock options were granted on 03/08/2017, vested equally over a three-year period, and were fully vested on 04/01/2020.