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.

Two white HVAC units stacked in a basement beside brick walls and shiny ductwork.

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 oil heating systems. Count on us for upfront pricing, 24/7 emergency response, and skilled installations.

Outdoor air conditioning unit beside a house wall and window, sitting on a concrete pad.

HVAC System Sales & Installation

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

Brick house exterior with windows and a white HVAC unit beside the wall

Geothermal Heating & Cooling

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

Brick rooftop with HVAC units and chimneys in front of a brick building

Heat Pumps (Air & Ground Source)

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

Industrial boiler room with gray boiler, pipes, valves, and gauges against a stone wall.

Gas & Oil Furnaces

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

Person cleaning a large speaker cabinet in a dim workshop with tools and ducting nearby

Seasonal Maintenance

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

Roof with propane tank, coiled cables, and electrical equipment beside a brick wall.

Light Commercial HVAC up to 15 Tons

Rooftop package and split system services for small businesses.

Water heater and expansion tank in a utility room with exposed pipes and shelving.

Steam & Hot Water Boilers

Certified repair and installation for hydronic boiler systems.

Living room with gray sofa, round wicker coffee table, wall-mounted TV, and front door by wood floor

Indoor Air Quality Assessments

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

Dirty HVAC vent and two dusty air filters on a beige wall

Steam Heating

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

Blue metal safe or vault door in a dim basement with rough stone walls and concrete floor.

Oil Heat Specialist

Dedicated oil heating system maintenance, including nozzle tuning, fuel line checks, and filter replacements.