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A compressor that never runs still degrades. Homes in Teton County, MT have essentially no cooling season — no month of the year is warm enough to call for it. Refrigerant migrates into the oil during a long cold standoff, and when a unit finally starts after months of dormancy, that first cycle is hard on bearings and seals. A contractor diagnosing a failed compressor here checks for signs of slugging and oil contamination before anything else, because those are the failure modes a cold, idle machine produces. The condenser fan contactor also corrodes when it sits unused through a cold season, and a bad contactor is often what the homeowner mistakes for a dead compressor.
Half the homes in Teton County, Montana were built in 1962 or earlier (2020-2024 ACS 5-year). A house that old was likely heated and cooled by something long since retired, and the central AC system sitting in it today was added later, often more than once over. When a contractor opens a unit for repair, the question that determines the job's scope is whether the parts that system takes are still being made. Discontinued compressors, obsolete control boards, and refrigerant lines sized for an older spec turn a straightforward repair into a sourcing problem before any labor begins.
The Parts of a Central AC a Contractor Checks First
The outdoor condenser unit sits outside the house, usually on a concrete pad along an exterior wall, and it carries the compressor and condenser coil. These are the pieces a contractor looks at early, because a failed compressor or a fouled coil will stop the whole system cold. Inside, the air handler or furnace-mounted evaporator coil lives in the basement, utility closet, or attic and pulls heat out of the air moving across it.
The refrigerant lines run between those two units, and the expansion valve controls how refrigerant moves through the evaporator coil. The thermostat on the wall is also on a contractor's checklist, since a wiring fault or a failed sensor there can mimic the symptoms of a much larger problem.
The drawing shows the general layout of a central AC system, and a licensed contractor determines which components and conditions apply to this particular house.
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206 severe weather events were recorded in Teton County, Montana between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Teton County, Montana were built in 1962 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesTeton County, Montana holds 2,945 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 75.5% of the occupied homes in Teton County, Montana (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Covering Central AC Repair in Teton County, Montana10 sourced rules and standards
What happens when a contractor comes out
Split-system central air conditioners rated below 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners rated at or above 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.
Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.
Federal efficiency standards for split-system central air conditioners and heat pumps are set on each certified combination of outdoor unit and indoor coil rather than on the outdoor unit alone.
Residential and light commercial air conditioning and heat pump systems assembled in the field, including mini-splits and unitary systems, may not be installed on or after January 1, 2025 using a refrigerant with a global warming potential above 700.
A field-assembled system whose specified components were all manufactured or imported before January 1, 2025 carries no installation compliance date under the refrigerant restrictions and may still be installed.
Licensing and Legal Requirements in Teton County, Montana
Montana’s contractor licence does not reach a casual, minor or inconsequential job whose total price for labour, materials and everything else is less than $2,500 — and the exemption is lost if the work is only part of a larger operation, or if a job is divided up to get under the figure.
Montana requires a current construction contractor licence from the Department of Labor and Industry: an individual or business may not engage in business as a construction contractor without one.
Severe Weather Events in Teton County
Weather puts direct mechanical stress on cooling equipment, and the load it creates is specific to where the equipment runs. That stress shows up in repair demand, which is why local weather history is part of the picture for Central AC service in Teton County.
206 severe weather events, 2016–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.