AC Installation in Lebanon, NH
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Lebanon doesn't ask much of an air conditioner
Summer afternoons here average just 76°F. That's mild enough that most homes in Grafton County get by without cooling running for months at a stretch. A new system here isn't fighting the kind of heat that wears down a compressor season after season.
What it does need to handle is the weather that shows up fast. This area has logged 133 damaging wind events and 30 hail storms over the past ten years, with hail up to 1.5 inches. Whatever gets installed outside your home should be able to take a hit and keep running. And if you're putting in new central air, it has to meet the federal minimum of 13.4 SEER2, the efficiency floor for any system built since 2023.
- 76°F
- the average summer afternoon it cools against
- 30 hail events
- in ten years, and hail bends the fins on outdoor coils
- 13.4 SEER2
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Going above the federal minimum saves little here, about $10 a year.
Estimates for a typical Grafton County home, from EIA household energy data, New Hampshire fuel prices and NOAA climate normals. Your home will differ.
New Hampshire has no state license for HVAC contractors.
There is no state board behind a contractor's name here, and no state test they had to pass to work on your air conditioner. New Hampshire leaves this trade unlicensed, so nothing at the state level checks who they've worked for before or whether they know the job.
The protection here comes from Grafton County's own building office instead. An air conditioner install in most cities and counties needs a permit and a final inspection once the work is done, and that inspection is what confirms the job was done right.
Source: New Hampshire General Court
- What size air conditioner does my house need?
- The right size depends on your square footage, your ceiling height, how much shade and window area your house has, and how well it's insulated. There's no shortcut number that works for every home. A contractor figures this out with a load calculation, not a chart, because a unit that's too big will cycle on and off too fast and one that's too small will run constantly without keeping up. Given that summer afternoons here average only 76°F, your home may need less cooling capacity than the same size house in a hotter climate, but that still has to be worked out room by room.
- Should I replace the whole system or just the outdoor unit?
- If your indoor coil and outdoor unit were installed together and matched for each other, replacing only the outdoor unit can throw that match off and hurt both efficiency and how long the system lasts. New outdoor units also have to meet the 13.4 SEER2 minimum that took effect in 2023, and pairing new equipment with an old indoor coil doesn't always meet that rating in practice. A contractor can check whether your existing coil will work with a new outdoor unit or whether the whole system needs to come out together.
- Do HVAC contractors in Lebanon need a state license to work on my home?
- No. New Hampshire has no state license or registration for HVAC contractors, so there's no state credential to ask for. What you'll still need is a permit from the local building office for an air conditioner installation, along with an inspection once the work is done. Ask any contractor you're considering how long they've been doing this work and for references, since the state isn't screening them for you.