The world of air conditioning installation rests at least partially on the shoulders of Atlas Comfort Systems USA. The company, a subsidiary of Comfort Systems USA, is a mechanical contractor specializing in the design and installation of heating, ventilation, and air conditioning (HVAC) and plumbing systems for residential multi-family and commercial high-rise buildings throughout the US. It has about $100 million of projects under contract on everything from apartments to hotels. Founded in 1947, Atlas Comfort Systems USA operates from offices in Texas and Virginia. California and Florida are also key markets the company serves.