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Comfort Systems USA, Inc. provides comprehensive mechanical and electrical contracting services, including design, installation, maintenance and retrofit of heating, ventilation, air‑conditioning (HVAC), plumbing, piping, controls, fire‑protection and electrical systems, as well as off‑site modular construction and building‑automation solutions. The company operates in the specialty‑contractor segment of the construction industry, serving commercial, industrial and institutional customers such as data centers, hospitals, schools, manufacturing plants and government facilities. With a decentralized network of more than 40 operating units and locations in virtually all U.S. states, Comfort Systems is one of the largest mechanical‑and‑electrical contractors in the country and a component of the S&P 500, noted for its focus on energy‑efficient retrofits and nationwide customer relationships.