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

HVAC Residential Service: Serving Prince Frederick South in Calvert County and All of St Marys County in Southern MD


Heat Pumps, Heating & Cooling System Installation Services & System Types


  • Propane Furnace Installations
  • Propane Furnace Service & Repair
  • Radiant Heating Installations
  • Radiant Heating Service & Repair
  • Heat Pumps Installations
  • Heat Pump Service & Repair
  • Air Conditioning Installations
  • Air Conditioning System Service & Repair
  • Heating & Cooling Zoning
  • Heating & Cooling System Service Agreements


  • Heating & Cooling System Service & Repair
  • Heating & Cooling Air Duct Cleaning
  • Direct Heating & Cooling System Replacement
  • Heating & Cooling System Service & Repair
  • Oil Tank Installations
  • Oil Tank Service & Repair
  • Oil Furnaces Installations
  • Oil Furnace Service & Repair
  • Gas Furnaces Installations
  • Gas Furnace Service & Repair
Carrier comfort So MD Carrier heat pump infinity

We service or repair the following heating and air conditioning manufacturers. In addition, we can replace the following heating and air conditioning manufacturers with Carrier.


Airquest, Airtemp, Amana, American-Standard, Armstrong, Bard, Bryant, Carrier, Coleman, Comfortmaker, Crane, Daikin Us, Ducane, Fasco, Fraser-Johnston, Fedders, Friedrich, General Electric, Green, Colonial, International Oil Burner, Intertherm, Iron Fireman, ITT, Janitrol, Johnson Air-Ease, Lennox, Luxaire, Magic Chef, Mayflower, Mcquay, Miller, Climatrol, Payne, Peerless, Rheem, Ruud, Square D, Tappan, Trane, Westinghouse, Whirlpool, Williamson, York.


Financing Options


Great Mills Heating and Air offers various financing options:


Call the office for other options 301-994-0522.


Call Us or Email Us


for Info on SMECO Rebates and Carrier Spring Rebates On complete HVAC system installations!




Southern Calvert heating Air
Carrier Dealer So MD
Puron refrigerant MD
North American Tech
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