X0306 4 2015-03-25 0 0001035983 COMFORT SYSTEMS USA INC FIX 0001319782 Shaeff Julie C/O COMFORT SYSTEMS USA, INC. 675 BERING DR. SUITE 400 HOUSTON TX 77057 0 1 0 0 Chief Accounting Officer Common Stock 2015-03-25 4 A 0 2917 0 A 46058 D Common Stock 2015-04-01 4 A 0 5426 0 A 51484 D Common Stock 2015-04-02 4 F 0 425 21.04 D 51059 D Common Stock 2015-04-02 4 F 0 343 21.04 D 50716 D Common Stock 2015-04-02 4 F 0 305 21.04 D 50411 D Common Stock 2015-04-02 4 F 0 1435 21.04 D 48976 D Employee Stock Option (Right to Buy) 19.67 2015-03-25 4 A 0 7530 0 A 2016-04-01 2025-03-25 Common Stock 7530 7530 D Each restricted stock unit granted on March 25, 2015 represents a right to receive one share of common stock and will vest in equal installments over a three-year vesting schedule. Reflects dollar-denominated performance restricted stock units granted on March 26, 2012 that vested on April 1, 2015. These units vested as a result of the Company's 2012-2014 relative Total Shareholder Return and 2012-2014 Company average EPS-the applicable performance metrics. Forfeited shares are related to dollar-denominated performance restricted stock units and restricted stock units that vested on April 1,2015 and were priced based on the average of the high and low stock price on April 1, 2015. Forfeitures were processed on April 2, 2015. Reflects forfeited shares related to the third and final vesting of restricted stock units granted on March 26, 2012. Price is based on the average of the high and low stock price on April 1, 2015. Reflects forfeited shares related to the second vesting of restricted stock units granted on March 20, 2013. Reflects forfeited shares related to the first vesting of restricted stock units granted on March 19, 2014. Reflects forfeited shares related to the vesting of dollar-denominated performance restricted stock units granted on March 26, 2012. Stock options vest in equal installments over a three-year vesting schedule. Stock options will expire at the earlier of ten years from the date of grant or three months following termination of employment. /s/ Trent T. McKenna, by power of attorney 2015-04-02