AC Installation Cost in Idaho

Across Idaho, homeowners pay $4,100 to $9,200 for new AC installation. Climate, labor rates and housing age all move the price. In Idaho's cities, the median home dates to about 1991.

AC Installation Prices in Idaho Cities

City	Estimate	Heating / cooling degree days
Boise City	$4,400 to $10,000	5,320 / 1,045
Meridian	$4,700 to $10,600	5,320 / 1,045
Nampa	$3,900 to $8,900	5,549 / 825
Caldwell	$3,900 to $8,700	5,549 / 825
Idaho Falls	$3,700 to $8,300	7,144 / 443

From 2020 through 2025, NOAA recorded 954 winter storm and ice events, 38 heat events, 55 extreme cold events and 122 hail reports in Idaho. 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 Idaho

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