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A compressor that never runs is not a compressor at rest. Homes in Franklin County, ID have essentially no cooling season — no month of the year is warm enough to call for it. Contactors corrode when they go untouched for years, refrigerant can migrate through a system that never pressurizes, and capacitors lose their charge-holding ability on the shelf. When a homeowner does switch the unit on during an unusual stretch of heat, those faults surface all at once. A contractor sizing and installing a new system here has to account for that pattern, because equipment rated for an active cooling load behaves differently when it sits cold through the whole calendar.
Ductwork installed for the original heating and cooling setup in a house often has trunk sizes, flex runs, and register placements that made sense for what was there then, not for what a contractor is putting in now. Half the homes in Franklin County, Idaho were built in 1975 or earlier (2020-2024 ACS 5-year). That gap between the original build and current equipment is where installation decisions get made: whether existing ducts can carry the airflow a new system needs, and whether the electrical service will support the load without a panel upgrade. A contractor who skips that assessment before quoting central AC is pricing the equipment and guessing at the rest.
What Goes Into a Central AC Installation
The outdoor condenser unit sits outside the house, usually on a concrete pad at ground level, and holds the compressor and condenser coil. Inside, the air handler or furnace-mounted evaporator coil occupies a closet, utility room, or attic space and is the indoor half of the system a contractor pairs with the outdoor unit.
The refrigerant line set runs between the two units, connecting the outdoor and indoor coils through a small opening in the wall or floor. A thermostat mounts on an interior wall and gives the homeowner control over when the system runs.
The drawing beside this text shows the general layout of a central AC system, and a licensed contractor determines exactly how each piece fits into your home.
Find a contractor in Franklin CountyFranklin County, Idaho, by the numbers
80 severe weather events were recorded in Franklin County, Idaho 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 Franklin County, Idaho were built in 1975 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFranklin County, Idaho holds 5,212 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.1% of the occupied homes in Franklin County, Idaho (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Franklin County, Idaho9 sourced rules and standards
What the Installation Actually Looks Like
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 Franklin County, Idaho
Idaho requires a state certificate of competency for heating, ventilation and air conditioning work: it is unlawful to engage in the business, trade or practice without passing the examination and holding the certificate.
Severe Weather History in Franklin County
Weather patterns shape how hard a cooling system has to work and how long it lasts. What the climate does in Franklin County is a local fact, and it belongs in any honest conversation about sizing and installing central AC here.
80 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.