Houston — Comfort Systems USA Inc., a provider of commercial, industrial and institutional HVAC services, announced in late February that it has agreed to acquire Riddleberger Brothers Inc., a full service commercial HVAC company based in Mt. Crawford, Va.

Riddleberger had 2007 revenues of approximately $65 million, and if Riddleberger had been part of Comfort Systems in 2007, the firm believes it would have contributed earnings before interest, taxes, depreciation and amortization of at least $7 million.