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Great Mills Heating and Air Conditioning, Inc. is a Southern MD, locally owned, HVAC contractor specializing 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. Since 1972, we have been installing and servicing Carrier heating and cooling equipment, and improving indoor air quality in the St. Mary's County and Southern Calvert County, Southern Maryland areas.