A recognized leader in the HVAC industry, Dualco, Inc. has been in business for over 50 years. Since 1960, founder Ralph Monaco has insured that Dualco, Inc. has always offered high quality products serviced and installed by qualified, friendly professionals.

With offices in Sterling, VA, Dualco, Inc. is able to service most of Virginia as well as Maryland. Dualco, Inc. holds a Virginia Class A Contractors License and a State License for Maryland. Dualco's fleet of service vehicles are radio dispatched and available for emergency service.

Our skilled experts know their business. Rely on them and our company reputation to give you fast, dependable, fair service. When you have an HVAC issue, you want to talk to a live person. Our staff will personally work with you to resolve your issue the first time you call.

Dualco, Inc. is unique among most HVAC contractors in that we also maintain our own in-house sheet metal shop. Fabrication of custom ductwork and fittings allows us to completely tailor any installation to exactly what our customer's need. This commitment to excellence is found in all aspects of Dualco, Inc.