- EPS Family of Companies - manufacturers' representatives for commercial HVAC equipment in the Washington-Baltimore Metropolitan region.
- H&B Products - manufacturers' representative in the HVAC industry.
- Mt. Vernon Heating & Air Conditioning - providing residential and commercial services.
- Service Specialties, Inc. - residential and commercial HVAC service and sales.
- Harvey Hottel, Inc. - commercial and residential HVAC contractors.
- NAC Group - specializes in treating water and air used in HVAC systems in commercial buildings.
- Metropolitan Duct & Flue, Inc. - cleaning ducts and kitchen hood systems in the DC metro area.
- Shapiro & Duncan, Inc. - provides complete mechanical system and HVAC enginering.
- Glenmont Air Conditioning and Heating
- Atlas, L.C. - specializing in existing home instalations and custom systems. Also offers the Heat Pump Maximizer.
- Brennans Heating and Air Conditioning
- Garneski Air Conditioning & Heating - repair, maintenance and installation of heat pumps, gas and oil furnaces, air conditioners and indoor air quality products.
- Air Conditioning Contractors of America
- Precision Equipment Sales - wholesale parts and equipment..
- Richards Heating & Air Conditioning Co. - specializing in residential service and replacement work.
- A Advantage - residential and industrial heating and air conditioning service and equipment. Serving Northern Virginia and surrounding areas.
- Pressure-Tech - designing/building multi-fuel fired boilers for home and business.
- TMS, Inc. - providing sales, service and installation to residential and commercial clients.
- Belair Engineering - heating and cooling services.
- Adapt, Inc. - supplier and manufacturer of portable air conditioning and spot cooling supplies and equipment.
- Continental Services - specialists in geothermal energy and radiant heating installations, both commercial and residential.
- Desbuild Incorporated - general construction, HVAC, roofing, and design build.
- V-TECH, inc. - specializes in home automation and electronics, electric and gas utility projects, HVAC systems technologies, consumer appliances, telco & cable industry developments.
- HVACDATA - offers a program that provides facilities administrators an overview of system operation.
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