AC Installation in Mountain Home, ID
A new air conditioner in Mountain Home will run from July through August every year. Tell us about the house, and a licensed contractor who covers Elmore County will get in touch.
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Two months of real heat, then it stops
Mountain Home only asks a new air conditioner to work hard for July and August. Summer afternoons average 83°F, which is warm enough that a unit sized wrong will run long and still leave the house uncomfortable, but the season is short enough that the equipment gets a break the rest of the year.
Hail and wind both show up here. Ten years of records show 4 hail events, one with stones up to 1.75 inches, and 36 damaging wind events. An outdoor condenser sits exposed to both, so where it goes and how it is protected matters as much as the unit itself. Any new central air conditioner installed today has to meet 13.4 SEER2, the federal efficiency minimum that took effect in 2023.
- 2 months
- July through August, your air conditioner is on duty
- 83°F
- the average summer afternoon it cools against
- 4 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 Elmore County home, from EIA household energy data, Idaho fuel prices and NOAA climate normals. Your home will differ.
Idaho requires HVAC contractors to hold a state license.
Idaho licenses HVAC contractors through the state's HVAC Board. That license is tied to the contractor, not to each job, so it covers the business doing the work rather than the specific installation going in at your house. It means the contractor was tested and is on record with the state.
For this job, that license is what stands behind the work. Most cities and counties in Idaho also require a permit for an air conditioner installation, along with an inspection once it's done, and that inspection is what confirms the unit was installed the way it's supposed to be.
Sources: Idaho Legislature · Idaho Division of Occupational and Professional Licenses
- What size air conditioner does my house need?
- The right size comes from a load calculation, not the square footage alone. A contractor measures your windows, insulation, ceiling height, and how much shade your house gets, then works out how much heat your home actually gains on a hot afternoon. An oversized unit cools the air fast but shuts off before it pulls the moisture out, so the house feels damp. Too small, and it runs constantly without catching up. With summer highs around 83°F here, a properly sized unit should keep up without either problem.
- Should I replace the whole system or just the outdoor unit?
- If your indoor coil and outdoor unit were installed together and are close in age, replacing just the outdoor unit usually isn't a good idea. The coil and condenser are matched to work at a specific capacity and efficiency, and pairing a new condenser with an old coil can mean the system never runs the way it's rated to, and may not be covered by the manufacturer's warranty. A contractor can check the age and condition of the coil, the refrigerant type, and whether the ductwork still matches what a new system needs before telling you which way makes sense for your house.
- Do HVAC contractors in Mountain Home need a state license to work on my home?
- Yes. Idaho requires HVAC contractors to hold a state license, issued through the state's HVAC Board, and that covers installing an air conditioner. Most cities and counties also require a permit for the installation and an inspection once the work is finished, so check with the local building office before work starts. Asking to see the license number up front is a fair question to ask any contractor bidding the job.