HVAC System Replacement Cost in New Hampshire

Full HVAC system replacement in New Hampshire costs $10,800 to $23,500 in 2026, though city-to-city prices vary quite a bit. Heating drives most HVAC spending in New Hampshire: its larger communities average 6,949 heating and 525 cooling degree days a year.

HVAC System Replacement Prices in New Hampshire Cities

City	Estimate	Heating / cooling degree days
Manchester	$10,400 to $22,700	6,906 / 537
Nashua	$11,000 to $23,900	6,592 / 704
Concord	$10,600 to $23,100	6,980 / 528
Dover	$11,300 to $24,500	6,919 / 410
Rochester	$10,100 to $21,900	6,789 / 506

From 2020 through 2025, NOAA recorded 300 winter storm and ice events, 7 heat events, 15 extreme cold events and 213 hail reports in New Hampshire. 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 New Hampshire

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