Comfort Systems USA, Inc. (Comfort Systems) provides heating, ventilation and air conditioning (HVAC) installation, maintenance, repair and replacement services within the mechanical services industry. As of December 31, 2010, the Company had 39 operating units in 70 cities and 84 locations throughout the United States. The Company operates in the commercial, industrial and institutional HVAC markets and perform its services within office buildings, retail centers, apartment complexes, manufacturing plants, and healthcare, education and government facilities. The Company provides specialized applications, such as building automation control systems, fire protection, process cooling, electronic monitoring and process piping. During the year ended December 31, 2010, approximately 99% of its consolidated revenues were derived from commercial, industrial and institutional customers and multi-family residential projects. On July 28, 2010, it acquired ColonialWebb Contractors Company.