New Hampshire HVAC Guide

HVAC Service in New Hampshire

Licensed HVAC contractors across every county in New Hampshire.

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A two-story red brick house with a white covered porch, gabled roof, and two upper windows, set behind a mown lawn with a straight concrete walkway, trimmed hedges, and large green trees on both sides.

What New Hampshire homes are up against.

1,7801,780 severe weather events were recorded in New Hampshire between 2015 and 2024.
648,472New Hampshire holds 648,472 housing units (2020-2024 ACS 5-year).
1979Half the homes in New Hampshire were built in 1979 or earlier (2020-2024 ACS 5-year).
251Hillsborough County carries the heaviest storm record in New Hampshire, with 251 events between 2015 and 2024.

NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31. · U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates

Exterior wall of a building with gray horizontal vinyl siding and a metal downspout, snow piled at its base and on the roof edge, with bare tree branches and falling snowflakes against a pale sky.

A homeowner deciding whether a strange smell or a noisy start is worth a call is really asking how much wear the furnace has already taken on. Homes in New Hampshire run heat about nine months a year, from September through May. That leaves little time for the burner and heat exchanger to sit idle and recover between cycles. A part that is slipping toward failure keeps getting asked to fire again before it can be caught, which is why a small fault this time of year tends to show up as a full breakdown rather than a warning sign.

NOAA National Centers for Environmental Information, nClimDiv county and statewide normals, 1991-2020.
A gray electrical panel with its door open showing rows of circuit breakers, mounted on a stone wall with a conduit running to the ceiling joists and a rake leaning at right.

Before any new furnace or heat pump goes in, a contractor has to open up what is already there. Duct runs need to be measured for size and checked for leaks or crushed sections, and the electrical panel needs to be checked for the right capacity and a working disconnect nearby. Half the homes in New Hampshire were built in 1979 or earlier (2020-2024 ACS 5-year). That figure is exactly why a contractor walks through and opens panels before quoting anything. Two houses on the same street can need completely different work, one a straightforward swap, the other new ductwork or an upgraded circuit, and there is no way to know which without a look inside.

U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates

Does where you live in New Hampshire put extra stress on your HVAC system?

Severe weather events by county — New Hampshire
Hillsborough County251
Cheshire County247
Grafton County242
Carroll County214
Rockingham County200
Coos County184
Merrimack County138
Sullivan County111
Strafford County97
Belknap County96

2015–2024 · Source: NOAA National Centers for Environmental Information, Storm Events Database.

FIND YOUR COUNTY'S RANK

A county with a heavier storm record puts more demand on the equipment sitting outside your house. Wind, hail and ice all load stress onto a condenser that has to keep running through it, and a unit sized or placed without that in mind will wear faster. Have a contractor check where the outdoor unit sits, how well it is anchored, and the condition of the unit itself.

New Hampshire has no state license for HVAC contractors.

Source: New Hampshire General Court

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Furnace vs Boiler

Heat pump vs Furnace