Comfort Systems USA installs and services heating, ventilation, air conditioning and electrical systems for commercial, industrial and institutional buildings, working as a mechanical and electrical contractor rather than a manufacturer of equipment. The company has grown substantially through acquiring smaller regional mechanical contractors, building a national footprint across a historically fragmented, locally-run industry. Its work spans both new construction installation and ongoing service and maintenance contracts, giving it a mix of project-based revenue and steadier recurring service income. Comfort Systems has benefited significantly from the data center construction boom, since data centers require extensive specialized mechanical and electrical work to manage the substantial cooling and power needs of the servers housed inside them.