Comfort Systems Increases Stock Repurchase Program

Comfort Systems USA, Inc. a leading provider of commercial, industrial and institutional heating, ventilation and air conditioning (“HVAC”) services, today announced that its Board of Directors has approved an amendment to the company’s stock repurchase program to increase the shares authorized and remaining as available to purchase back up to 1,000,000 shares by authorizing the company to acquire up to 964,316 additional shares of its outstanding common stock. The company’s existing stock repurchase program had previously authorized the repurchase of up to 2,888,343 shares of the company’s outstanding common stock.

Through November 13, 2008, the Company had repurchased 2,852,659 shares of the company’s common stock at an aggregate price of $33,950,636. This extension of the stock repurchase program will “top off” the plan and permit the Company to repurchase up to an additional one million shares of its currently outstanding common stock beyond what had already been purchased as of November 13, 2008.

The share repurchases will be made from time to time at the Company’s discretion in the open market or privately negotiated transactions as permitted by securities laws and other legal requirements, and subject to market conditions and other factors. The Company expects that the share repurchases will be financed with available cash. The Company’s Board of Directors may modify, suspend, extend or terminate the program at any time.

Comfort Systems USA® is a premier provider of business solutions addressing workplace comfort, with 74 locations in 59 cities around the nation. For more information, visit the Company’s website at www.comfortsystemsusa.com.