AC Installation in Hardin, MT
A new air conditioner in Hardin will run from July through August every year. Tell us about the house, and a licensed contractor who covers Big Horn County will get in touch.
Tell us about the job
It takes about a minute.
Two months of real heat is still enough to wear out the wrong unit
Hardin only asks for cooling in July and August, with afternoons averaging 82°F. That is a short season, but it is a demanding one, and a new system still needs to be sized and installed right for those two months to go smoothly.
Any new central air conditioner installed now has to meet 13.4 SEER2, the federal minimum since 2023. Big Horn County has also seen 55 hail events and 91 damaging wind events over the past ten years, with hail up to 2.5 inches. The outdoor unit sits outside through all of that, so where it goes and how it is installed matters as much as the equipment itself.
- 2 months
- July through August, your air conditioner is on duty
- 82°F
- the average summer afternoon it cools against
- 55 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 $20 a year.
Estimates for a typical Big Horn County home, from EIA household energy data, Montana fuel prices and NOAA climate normals. Your home will differ.
Montana requires HVAC contractors to hold a state license.
The license is tied to the contractor, not to the specific job. It stands behind every installation they do, not just this one. Montana sets one exception worth knowing. Work under $2,500 does not require a licensed contractor. A full air conditioner installation usually runs past that amount, which puts this job under the license requirement.
Because Montana licenses the contractor, that license is what backs the work on this installation. Most cities and counties also require a permit for an air conditioner installation and an inspection once the work is done. The local building office checks the finished work, separate from the state license itself.
Source: Montana Legislature
- What size air conditioner does my house need?
- It depends on your home's square footage, how much sun hits your walls and windows, your insulation, and your layout, not just a rule of thumb. A unit that's too big cools the air fast but shuts off before it pulls the humidity down, so rooms feel damp. One that's too small runs constantly and still can't keep up on the hottest afternoons. A contractor will do a load calculation on your actual house before recommending a size.
- Should I replace the whole system or just the outdoor unit?
- If your indoor coil and outdoor unit are matched and both in good shape, replacing just the outdoor unit can work. If the system is old, the two often aren't compatible once one side is new, and mismatched equipment can lose efficiency or wear out sooner. A contractor can check the age and condition of the indoor coil, the ductwork, and the refrigerant type before telling you whether a partial swap makes sense for your house.
- Do HVAC contractors in Hardin need a state license to work on my home?
- Yes. Montana requires HVAC contractors to hold a state license through the Department of Labor and Industry. Installing an air conditioner isn't the kind of small job that falls under the state's exemption for minor work, so it needs a licensed contractor. You'll also likely need a permit from the local building office, with an inspection once the work is done.