Comfort Systems USA, Inc.

Comfort Systems USA, Inc. provides mechanical and electrical contracting services across the United States. Established in 1997, the company operates through 50 units with 190 locations in 142 cities. Its mechanical segment focuses on heating, ventilation, and air conditioning (HVAC), plumbing, piping, controls, off-site construction, monitoring, and fire protection. The electrical segment handles the installation and servicing of electrical systems. The company builds, installs, maintains, repairs, and replaces mechanical, electrical, and plumbing (MEP) systems primarily for commercial, industrial, and institutional markets. Services are performed in facilities such as manufacturing, healthcare, education, office, technology, retail, and government. In 2025, substantially all consolidated revenue came from commercial, industrial, institutional customers, and multi-family residential projects. Approximately 63.2% of 2025 revenue was from installation services in new facilities, while 36.8% came from renovation, expansion, maintenance, repair, and replacement services in existing buildings. For 2025, 73.3% of revenue was from Mechanical Services and 26.7% from Electrical Services. The company operates within the U.S. commercial, industrial, and institutional mechanical and electrical contracting market, which it estimates generates approximately $700 billion in annual revenue.