Comfort Systems' Brewster Earle Appointed as Chair of ABC National Green Building Committee

Comfort Systems USA, Inc. (NYSE:FIX), a leading provider of commercial, industrial and institutional heating, ventilation and air conditioning (“HVAC”) services, today announced that W. Brewster Earle, President of Comfort Systems USA Energy Services, has been appointed the first chairman of the Associated Builders and Contractors (ABC) newly formed National Green Building Committee. William D. Fairchild, National Chairman of ABC, officially appointed Brewster to the position of Chairman, National Green Building Committee on July 16, 2008.

“Brewster will be a great asset for this new committee and will play a key role with other members to help meet the challenges ahead,” said Fairchild. “We look forward to his leadership to ensure that ABC remains in the forefront and our members continue to thrive in the green building industry.”

Brewster stated: “I am pleased and honored to be appointed Chair of this important committee. Green building is one of our industry’s most far-reaching and important topics. Since I joined Comfort Systems USA Energy Services in 2003 we have worked to ensure that Comfort Systems remains at the forefront of green building, and I will work harder than ever to serve ABC’s members in this complementary position.”

Bill Murdy, Comfort Systems USA’s Chairman and CEO, said, “We are happy to support Brewster in this endeavor. In a typical building, the HVAC system is the largest user of energy, commonly accounting for half of the energy usage of large facilities. In order to address the energy and green building concerns that are so important to our customers and stakeholders, we have invested heavily over the past few years to develop a service offering and capability that can deliver credible results. Our support for Brewster is a logical extension of our commitment to having unmatched green building expertise and credentials.”

Brewster started with Comfort Systems USA Energy Services in 2003 as Director of Business Development, and in addition to his current position as President with Energy Services, he was recently appointed to the position of Senior Corporate Vice President Energy Services, responsible for corporate strategy and marketing for energy services. Brewster’s primary expertise is in financial and economic modeling, and on a national basis Brewster leads Comfort Systems USA’s energy project development, green building training, and green awareness efforts. Comfort Systems USA employs an increasing number of accredited green building professionals, including individuals at a majority of its locations across the country. Brewster and his team, based in Hartford, Connecticut, also provide support and resources to energy efficiency and green building initiatives at Comfort Systems USA’s many local operations. Comfort Systems USA is a U.S. Green Building Council Member and an EPA Energy Star® Partner.

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 atwww.comfortsystemsusa.com.

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are based on the current plans and expectations of Comfort Systems USA, Inc. and involve risks and uncertainties that could cause actual future activities and results of operations to be materially different from those set forth in the forward-looking statements. Important factors that could cause actual results to differ include, among others, national or regional weakness in non-residential construction activity, difficulty in obtaining or increased costs associated with bonding, shortages of labor and specialty building materials, the use of incorrect estimates for bidding a fixed price contract, undertaking contractual commitments that exceed our labor resources, retention of key management, the Company’s backlog failing to translate into actual revenue or profits, errors in the Company’s percentage of completion method of accounting, the result of competition in the Company’s markets, seasonal fluctuations in the demand for HVAC systems, the imposition of past and future liability from environmental, safety, and health regulations including the inherent risk associated with self-insurance, adverse litigation results and other risks detailed in the Company’s reports filed with the Securities and Exchange Commission. Important factors that could cause actual results to differ are discussed under “Item 1A. Company Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2007. These forward-looking statements speak only as of the date of this release.Comfort Systems USA, Inc. expressly disclaims any obligation or undertaking to release publicly any updates or revisions to any forward-looking statement contained herein to reflect any change in Comfort Systems USA, Inc.’s expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based.