Comfort Systems USA, Inc. provides installation, maintenance, repair, and replacement services for the heating, ventilation, and air conditioning (HVAC) systems in the mechanical services industry in the United States. The company engages in the design, engineering, integration, installation, and start-up of HVAC, building automation controls, and related systems; and maintenance, repair, replacement, reconfiguration, and monitoring of HVAC systems and industrial process piping. It also provides specialized applications, such as building automation control systems, fire protection, process cooling, electronic monitoring, and process piping, as well as electrical and plumbing services. The company offers its services for office buildings, retail centers, apartment complexes, and manufacturing plants, as well as healthcare, education, and government facilities. It serves building owners and developers, general contractors, architects, consulting engineers, and property managers in the commercial, industrial and institutional HVAC markets. Comfort Systems USA, Inc. was founded in 1917 and is headquartered in Houston, Texas.