AC Installation Cost in Maryland

Across Maryland, homeowners pay $4,800 to $10,900 for new AC installation. Climate, labor rates and housing age all move the price. In Maryland's cities, the median home dates to about 1976.

AC Installation Prices in Maryland Cities

City	Estimate	Heating / cooling degree days
Baltimore	$3,900 to $8,800	3,858 / 1,748
Columbia	$5,300 to $12,000	4,313 / 1,469
Germantown	$4,700 to $10,600	4,977 / 990
Frederick	$4,600 to $10,300	4,275 / 1,397
Waldorf	$4,700 to $10,600	4,588 / 1,029

From 2020 through 2025, NOAA recorded 224 winter storm and ice events, 165 heat events, 60 extreme cold events and 205 hail reports in Maryland. Those are the days when emergency HVAC calls pile up.

When It Makes Sense

The AC is 12 to 15 years old or more
It still runs on R-22 refrigerant
It has had more than one refrigerant leak
The house can't reach the thermostat setting on hot afternoons
Summer electric bills keep going up

What Moves the Price

Tonnage, based on house size and local climate
SEER2 rating and whether the compressor is single-stage or variable-speed
Whether the coil and line set also need replacing
Electrical work such as a new disconnect, breaker or wiring
The pad, permit and refrigerant (R-410A or the newer R-454B)

Common Questions

What size AC do I need?

It depends on square footage, insulation, windows and climate. The rough rule is a ton for every 450 to 650 sq ft, but only a Manual J calculation gives you a real number.

How long does a new AC last?

With yearly maintenance, 12 to 17 years. Salt air and extreme heat shorten that.

Other HVAC Prices in Maryland

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