AC Installation in Manchester, NH
A new air conditioner in Manchester will run from July through August every year. Tell us about the house, and a licensed contractor who covers Hillsborough County will get in touch.
Tell us about the job
It takes about a minute.
Two months of real heat, then months of standing idle
Manchester only asks for cooling in July and August, with afternoons averaging 79°F. That is a short season, but it still needs to work on the first hot day and every day after, then sit unused the rest of the year.
Any new central air conditioner installed here has to meet the federal minimum of 13.4 SEER2. Hail and wind show up in this county too, records show 30 hail events and 147 damaging wind events over the past ten years, so the outdoor unit needs to hold up to more than just heat.
- 2 months
- July through August, your air conditioner is on duty
- 79°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
A higher-efficiency unit would save about $30 a year to run in Hillsborough County compared with a new unit at the federal minimum.
Estimates for a typical Hillsborough 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 license and no state registration behind that contractor's name. No exam, no bond, no record kept in Concord. That does not mean there is no check on the work, only that the check does not come from the state.
In most cities and counties, an air conditioner installation needs a permit from the local building office and an inspection once the work is done. That is what stands in for a license here. It is not a credential on the contractor, it is a check on the job itself.
Source: New Hampshire General Court
- What size air conditioner does my house need?
- It depends on your square footage, your ceiling height, how much shade your house gets, and how well it's insulated, so there's no single number that fits every home. A contractor works this out with a load calculation, not a chart based on house size alone. Getting it right matters here too. Your summers only run July through August, but with afternoons averaging 79°F, a unit that's too big will cool the air fast and shut off before it pulls the moisture out, leaving rooms feeling clammy. Too small and it will run constantly on the hottest afternoons and still struggle to keep up.
- Should I replace the whole system or just the outdoor unit?
- If your indoor coil and outdoor unit aren't matched, replacing just the outdoor unit can hurt efficiency and shorten the life of both. Manufacturers rate their equipment as a matched pair, and mixing an old coil with a new condenser often means the system never runs the way either piece was designed to. Age matters too. New central air conditioners built since 2023 have to meet a 13.4 SEER2 minimum, so if your indoor coil is old, a contractor may tell you it won't pair well with a new outdoor unit at that efficiency level. A contractor can look at both pieces and tell you whether they're still a workable match.
- Do HVAC contractors in Manchester 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 check before hiring. What you should check instead is the local permit. Installing an air conditioner typically needs a permit from your local building office and an inspection once the work is done, so ask whoever you hire whether they'll pull that permit as part of the job.