Comfort Systems USA, Inc. revenue for the last year amounted to 5.21 B USD, the most of which — 3.95 B USD — came from its highest performing source at the moment, Mechanical Services, the year earlier bringing 3.18 B USD. The greatest contribution to the revenue figure was made by United States — last year it brought Comfort Systems USA, Inc. 5.21 B USD, and the year before that — 4.14 B USD.