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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1035983	Comfort Systems Usa Inc	FIX	Electrical Work (1731)	760526487

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1319782	Julie Shaeff	C/O Comfort Systems Usa, Inc. 675 Bering Dr. Suite 400 Houston TX 77057	Chief Accounting Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2017-10-30	1,001	$13.15	35,472	No	4	M	Direct
Common Stock	Acquisiton	2017-10-30	1,800	$11.00	37,272	No	4	M	Direct
Common Stock	Acquisiton	2017-10-30	1,800	$12.46	39,072	No	4	M	Direct
Common Stock	Acquisiton	2017-10-30	1,600	$13.87	40,672	No	4	M	Direct
Common Stock	Acquisiton	2017-10-30	2,000	$13.86	42,672	No	4	M	Direct
Common Stock	Acquisiton	2017-10-30	2,000	$16.15	44,672	No	4	M	Direct
Common Stock	Acquisiton	2017-10-30	1,500	$19.67	46,172	No	4	M	Direct
Common Stock	Disposition	2017-10-30	11,701	$42.54	34,471	No	4	S	Direct
Common Stock	Disposition	2017-10-31	944	$42.96	33,527	No	4	S	Direct
Common Stock	Disposition	2017-10-31	3,260	$42.95	30,267	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option to Buy	Disposition	2017-10-30	1,001	$0.00	1,001	$13.15
Common Stock	Option to Buy	Disposition	2017-10-30	1,800	$0.00	1,800	$11.00
Common Stock	Option to Buy	Disposition	2017-10-30	1,800	$0.00	1,800	$12.46
Common Stock	Option to Buy	Disposition	2017-10-30	1,600	$0.00	1,600	$13.87
Common Stock	Option to Buy	Disposition	2017-10-30	2,000	$0.00	2,000	$13.86
Common Stock	Common Stock	Disposition	2017-10-30	2,000	$0.00	2,000	$16.15
Common Stock	Common Stock	Disposition	2017-10-30	1,500	$0.00	1,500	$19.67

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2011-04-01	2018-03-26	No	4	M	Direct
1,008	2012-04-01	2019-03-26	No	4	M	Direct
1,799	2013-04-01	2020-03-25	No	4	M	Direct
1,666	2014-04-01	2021-03-24	No	4	M	Direct
4,674	2016-04-01	2023-03-20	No	4	M	Direct
5,567	2017-04-01	2024-03-19	No	4	M	Direct
3,519	2017-04-01	2025-03-25	No	4	M	Direct

Footnotes

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.
Stock options were granted on 3/26/2008, vested equally over a three-year period, and were fully vested on 4/1/2011.
Stock options were granted on 3/26/2009, vested equally over a three-year period, and were fully vested on 4/1/2012.
Stock options were granted on 3/25/2010, vested equally over a three-year period, and were fully vested on 4/1/2013.
Stock options were granted on 3/24/2011, vested equally over a three-year period, and were fully vested on 4/1/2014.
Stock options were granted on 3/20/2013, vested equally over a three-year period, and were fully vested on 4/1/2016.
Stock options were granted on 3/19/2014, vested equally over a three-year period, and were fully vested on 4/1/2017.
Stock options were granted on 3/25/2015, will vest equally over a three-year period, were vested as to two-thirds of the total number of options granted on 4/1/2017, and will be fully vested on 4/1/2018.