St. Marys and Calvert County Maryland HVAC Services   ♦   We Make Your Air Flow!

Lusby St Leonard Solomons Island Calvert MD HVAC Heating and Air Contractor

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Great Mills Heating Air

Great Mills Heating and Air Conditioning, Inc. is a Southern MD, locally owned, HVAC contractor serving Calvert County. We specialize in the repair, installation and servicing of Carrier home, residential, commercial, heat pumps, gas furnaces, propane furnaces, oil furnaces, water heaters, humidifiers and radiant heating. 

We also repair any make or model of heating and cooling comfort control system, heat pump or furnace.

Great Mills is your Calvert County heat pump repair, heat pump maintenance and heat pump replacement contractor in existing homes and commercial comfort control systems in the following areas: Lusby, St Leonard, Solomons Island, Dowell, Prince Frederick and Calvert County, Maryland.

Ask us about Geothermal Heating and Cooling Systems

Great Mills Heating and Air also installs WaterFurnace geothermal systems for homes who manufactures and sells more than anyone else in the business.

Calvert County MD Heat Pumps, Heating & Cooling System Installation Services & System Types

  • Lusby Heat Pumps Installations
  • St Leonard Heat Pump Service & Repair
  • Solomons Island Air Conditioning Installations
  • Calvert Geothermal Heating and Cooling Systems
  • Dowell Air Conditioning System Service & Repair
  • Calvert County Propane Furnace Installations
  • Prince Frederick Propane Furnace Service & Repair
  • St Leonard Radiant Heating Installations
  • Solomons Radiant Heating Service & Repair
  • Dowell Oil Tank Installations
  • Prince Frederick HVAC services

  • Calvert County Oil Tank Service & Repair
  • Lusby Oil Furnaces Installations
  • St Leonard Furnace Service & Repair
  • Solomons Gas Furnaces Installations
  • Prince Frederick Gas Furnace Service & Repair
  • Calvert County Heating & Cooling Zoning
  • Lusby Heating & Cooling System Service Agreements
  • Prince Frederick Heating & Cooling System Service & Repair
  • St Leonard Heating & Cooling Air Duct Cleaning
  • Solomons Direct Heating & Cooling System Replacement
  • Lusby Heating & Cooling System Service & Repair
Carrier comfort So MD
Carrier heat pump infinity

For a FREE estimate or service appointment click here

Phone: 301-994-0522 Emergency Service after 5pm: 240-925-2230