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A heat pump running deep into a Missouri winter is working at its hardest exactly when outside temperatures cut into its capacity. Homes in Hickory County, MO run heat about seven months a year, from October through April. The reversing valve cycles every time the system switches between heating and defrost mode, and those cycles stack up through the colder months. A contractor diagnosing a fault here checks that valve and the refrigerant circuit before assuming the compressor is the problem, because refrigerant loss under heating load presents differently than it does in a brief cooling season. Coil connections and the defrost control board accumulate wear on the same timeline.
Repair work on a heat pump here tends to open into more than the fault code suggests. Half the homes in Hickory County, Missouri were built in 1983 or earlier (2020-2024 ACS 5-year). Equipment installed into houses of that vintage has usually been replaced at least once, meaning the wiring connections, refrigerant line runs, and service history a contractor finds inside the unit are a record of those previous hands, not a clean original install. A refrigerant leak might trace back to a fitting that was adapted rather than replaced. A compressor failure can leave a contractor sourcing a part that fits the tonnage but not the current line, which changes what they can order and what they quote.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits outside the house and holds the compressor and condenser coil, the two components that handle most of the system's work. When a heat pump stops heating or cooling properly, the compressor is one of the first things a contractor looks at. The condenser coil, also in that cabinet, can restrict the whole system when it is blocked or damaged.
Inside the house, the air handler pushes conditioned air through the home and contains the evaporator coil and the blower motor, either of which can be the source of airflow or temperature problems. The reversing valve, which sits in the outdoor unit, is what allows the system to switch between heating and cooling modes, and a fault there shows up as a system that works in one direction but not the other.
The drawing shows a general layout of these components, and a licensed contractor determines which parts apply and what condition they are in for your specific house.
Find a contractor in Hickory CountyHickory County, by the numbers
87 severe weather events were recorded in Hickory 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 Hickory County, Missouri were built in 1983 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHickory County, Missouri holds 5,480 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 82.4% of the occupied homes in Hickory County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Hickory County
Weather extremes put heat pumps under load, and the harder a system works to keep up, the sooner its parts show wear. Repair needs in Hickory County track closely with what the weather demands of the equipment.
87 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.