Comprehensive HVAC Services in MD & PA

Master-Certified Heating & Cooling Expertise

Cornerstone Heating & Air Conditioning, Inc. offers complete indoor climate management tailored to the Mid-Atlantic weather extremes. Possessing Maryland Master License MD-6477, our master mechanics specialize in standard central air conditioning and gas heating, as well as specialized steam heating, oil furnaces, and ductless heat pumps. We bring precision diagnostic machinery, upfront pricing, and 24/7 service availability to every home we serve.

Technician holding red and blue manifold gauges while servicing an HVAC unit indoors

Indoor & Outdoor Lighting Installation

Install indoor and outdoor lighting solutions that improve visibility, security, and ambiance for your property.

Brick house at dusk with lit windows, landscaped front yard, and two people at the front door.

Comprehensive Heating, Cooling & Air Quality Services

Cornerstone Heating & Air Conditioning, Inc. provides complete climate control solutions engineered for durability, safety, and energy efficiency. Holding Maryland Master License MD-6477, our master mechanics service standard central air and gas systems alongside specialized geothermal ground loops, steam heating, and fuel oil burners. Count on us for upfront pricing, 24/7 emergency response, and skilled installations.

Technician repairing an outdoor air conditioner unit with tools on a building wall

HVAC System Sales & Installation

Comprehensive system sizing, sales, and code-compliant installations.

Outdoor air conditioning unit beside a brick house, mounted on black pads with visible pipes and vents

Geothermal Heating & Cooling

Eco-friendly ground-source heat pump loop installation and repairs.

Rooftop HVAC units with fans and connected ductwork beside a low parapet wall.

Heat Pumps (Air & Ground Source)

Dual-mode heating and cooling systems for year-round savings.

Gloved technician wiring an open HVAC unit with tools in a metal cabinet

Gas & Oil Furnaces

Complete diagnostic repair, tune-ups, and sales for gas and fuel oil units.

Technician inspecting gauges and hoses inside an aircraft cockpit area

Seasonal Maintenance

Precision spring and fall preventative tune-ups to extend system lifespan.

Snow-covered modern office complex with glass towers and curved facades beside a road

Light Commercial HVAC up to 15 Tons

Rooftop package and split system services for small businesses.

Utility room with water heater, boiler, pipes, and wall-mounted equipment in a clean basement.

Steam & Hot Water Boilers

Certified repair and installation for hydronic boiler systems.

Hand adjusting a white wall-mounted touchscreen thermostat showing 15.9° and 19.5° indoors

Indoor Air Quality Assessments

Testing air purity, whole-home filtration, and humidity control.

Empty room with a tall white window, radiator below, and an open wooden door on the left.

Steam Heating

Specialized care for historic steam boilers, air vents, and iron radiators.

White radiator in a bright modern living room with sofa, coffee table, and large window.

Oil Heat Specialist

Dedicated oil burner nozzle tuning, fuel line checks, and filter replacements.