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The compressor in a central AC unit here earns its failures in a short, hard push each year. Homes in Franklin County, MO run cooling about three months a year, from June through August. That compact season means the parts doing the real work, the compressor, the contactor, the condenser fan motor, cycle hard then sit cold for the better part of the year. Long idle periods let small faults hide: a capacitor that is weak, a contactor with pitted contacts, a refrigerant charge that is slightly off. A contractor diagnosing a repair in this county checks those standby failure points first, because the first hot week of June is when they announce themselves.
Ductwork in a house this old was sized and routed for whatever system was running when the house was new. That system is long gone, and what replaced it was adapted to what was already there. Half the homes in Franklin County, Missouri were built in 1984 or earlier (2020-2024 ACS 5-year). When a contractor opens a unit in stock like this, the question is often whether the failed component is still being made, and if not, what the available substitute actually fits. That answer determines the repair scope more than the fault itself does.
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 is where heat pulled from inside the home gets released. The indoor air handler or furnace-mounted evaporator coil lives in a utility space, basement, or attic. These are the two pieces a contractor goes to first when a system is not cooling.
The refrigerant lines run between those two units, and the thermostat on the wall is what tells the whole system when to run. The contractor also checks the condensate drain, which carries moisture away from the indoor coil, and the electrical disconnect near the outdoor unit, since a fault in any of these can stop a system that otherwise looks fine.
The drawing shows the general layout of a central AC system, and a licensed contractor determines which components apply and what condition they are in for your specific home.
Get matched in Franklin CountyFranklin County, by the numbers
129 severe weather events were recorded in Franklin County, Missouri 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, Missouri were built in 1984 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFranklin County, Missouri holds 46,312 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.5% of the occupied homes in Franklin County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind AC Repair in Franklin County, Missouri8 sourced rules and standards
What HVAC Repair Looks Like in Franklin County
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.
Severe Weather Events in Franklin County
Extreme weather puts mechanical stress on cooling equipment: hard starts after power outages, compressors running flat out through heat spikes, components cycling faster than they were sized for. How much of that a system absorbs depends on what the local climate actually delivers, and Franklin County has its own record.
129 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.