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A central AC system that ran fine last August may have a contactor that has been corroding all winter, or a compressor that started the season already weakened. Homes in Clark County, MO run cooling about three months a year, from June through August. That idle stretch is long enough to hide a developing fault entirely. Contractors diagnosing repairs here find themselves working out not just what failed, but when in the off-season it started, because the homeowner has had no signal until the unit would not cool on the first genuinely hot day. The compressor and condenser fan are the parts that take the load when the system does run, and those are the parts a contractor checks first.
Ductwork laid for one generation of equipment and pressed into service for another accumulates a specific kind of wear: seals that have flexed through more seasonal cycles than they were designed for, sections that have been patched or bypassed when the original path no longer made sense. Half the homes in Clark County, Missouri were built in 1970 or earlier (2020-2024 ACS 5-year). When a repair call turns out to be a refrigerant or electrical fix at the unit, the job is often straightforward. When the distribution side is involved, a contractor opening the system finds conditions that reflect what the house has been doing to its own infrastructure over a long run, and the repair scope follows from that, not from the equipment's nameplate.
The Parts of a Central AC a Contractor Checks First
The outdoor condenser unit sits outside the house, usually on a concrete pad beside the foundation, and it carries the compressor and the condenser coil. Those two components are where a contractor starts when a system stops cooling, because a failed compressor or a fouled coil will shut down the whole system before anything else does.
Inside the house, the air handler holds the evaporator coil and the blower. The air handler is usually in a utility closet, an attic, or a basement, and the evaporator coil and the expansion valve that feeds it are the next places a contractor looks when the outdoor unit checks out fine.
The drawing shows a typical central AC layout, and a licensed contractor determines which components and configurations apply to your specific house.
Get matched in Clark CountyClark County, Missouri, by the numbers
89 severe weather events were recorded in Clark 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 Clark County, Missouri were built in 1970 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClark County, Missouri holds 3,233 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.3% of the occupied homes in Clark 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 Clark County, Missouri8 sourced rules and standards
What HVAC Repair Looks Like in Clark 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 Clark County
Extreme weather puts real stress on central AC equipment, forcing it to run harder and longer than it was sized for. How much of that stress your system carries depends on what the local climate actually does, which is why this data belongs on a page about repair work in Clark County.
89 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.