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The compressor in a central AC unit starts and stops hundreds of times over a cooling season, and each cycle stresses the contactor and the motor windings. Homes in Platte County, MO run cooling about four months a year, from June through September. By late summer, a system that has been running hard since June has put real hours on those parts, and a contractor diagnosing a fault here looks at the compressor and condenser fan before anything else. Refrigerant charge and coil condition follow. A unit that was marginal at installation shows its wear in those components first.
Half the homes in Platte County, Missouri were built in 1992 or earlier (2020-2024 ACS 5-year). That gap between when a house was built and what now runs in it shapes what a repair job uncovers. A refrigerant leak, a failed capacitor, a compressor drawing hard: each one looks like a straightforward fix until the unit is open and a contractor is looking at components that have cycled through more than one equipment generation inside the same ductwork. Parts availability for a system this old is a real question, not a formality, and the answer changes the scope of the repair before any quote is written.
The Parts of a Central AC a Contractor Checks First
The outdoor condenser unit sits outside the house, usually on a concrete pad along a wall, and it is where heat gets shed to the outside air. The compressor lives inside that cabinet and is often where a contractor starts when the system runs but does not cool. A failed capacitor, a refrigerant leak, or a seized compressor all show up here first.
Inside the house, the air handler or furnace cabinet holds the evaporator coil and the blower. The evaporator coil is the piece that gets cold and pulls heat out of the air passing over it. A frozen coil, a dirty blower wheel, or a faulty blower motor will each stop conditioned air from reaching the rooms, so this cabinet is the second stop when the outdoor unit checks out.
The drawing shows a typical layout, and a licensed contractor will determine which components apply to your specific setup.
Get matched in Platte CountyPlatte County, by the numbers
169 severe weather events were recorded in Platte 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 Platte County, Missouri were built in 1992 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPlatte County, Missouri holds 46,606 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 67.4% of the occupied homes in Platte County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Repair in Platte County, Missouri8 sourced rules and standards
What HVAC Repair Looks Like in Platte 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 Platte County
Weather puts real hours on HVAC equipment. Every storm cycle that pushes temperatures to an extreme asks more of a central AC system, and that accumulated load is what drives repair needs over time.
169 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.