Comfort Systems USA, Inc. engages in the provision of mechanocal and electrical contracting services. It operates through Mechanical Services, Electrical Services, and Corporate segments. The Mechanical Services segment includes heating, ventilation, and air conditioning systems, plumbing, piping, and controls, as well as off-site construction, monitoring, and fire protection. the Electrical services segment handles installation and servicing of electrical systems. The company was founded by Alfred J. Giardinelli, Jr. on December 12, 1996 and is headquartered in Houston, TX.