Comfort Systems USA

Comfort Systems USA is a national mechanical and electrical contractor headquartered in Houston and traded on the NYSE under the ticker FIX. Formed in 1997, the company operates through a network of local subsidiaries that install and service HVAC, plumbing, electrical, and controls systems, with a growing share of work built off site in its own prefabrication shops. Its business has ridden the data-center and advanced-manufacturing boom hard: the firm posted record second-quarter 2026 revenue above $3 billion and a backlog near $14 billion. That mix of mechanical, electrical, and modular capability has made it one of the larger specialty contractors serving the sectors driving construction demand.