HVAC System Replacement Cost in Maine

Full HVAC system replacement in Maine costs $10,100 to $22,000 in 2026, though city-to-city prices vary quite a bit. Heating drives most HVAC spending in Maine: its larger communities average 7,284 heating and 394 cooling degree days a year.

HVAC System Replacement Prices in Maine Cities

City	Estimate	Heating / cooling degree days
Portland	$10,900 to $23,800	6,795 / 446
Lewiston	$9,200 to $20,100	7,270 / 485
Bangor	$9,300 to $20,200	7,626 / 379
South Portland	$11,000 to $23,900	6,795 / 446
Auburn	$9,800 to $21,300	7,270 / 485

From 2020 through 2025, NOAA recorded 728 winter storm and ice events, 133 heat events, 53 extreme cold events and 104 hail reports in Maine. Those are the days when emergency HVAC calls pile up.

When Replacement Makes Sense

Both the heating and cooling equipment are 15 years old or more
Both units keep needing repairs
Some rooms are uncomfortable, and the energy bills are high
An old R-22 AC paired with an aging furnace

What Moves the Price

Furnace plus AC, or heat pump plus air handler
Efficiency ratings: SEER2, AFUE and HSPF2
Equipment sized to the house and climate
Duct repair or replacement
Thermostat and zoning upgrades
Permits and electrical work

Common Questions

How often should an HVAC system be replaced?

Most systems get replaced every 15 to 20 years. AC units and heat pumps usually wear out before gas furnaces do.

Can I replace only the AC and keep my furnace?

Yes, as long as the indoor coil and blower work with the new AC. A mismatched system loses efficiency and can void the warranty.

Other HVAC Prices in Maine

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