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A heat pump here spends most of its working life in heating mode, and the reversing valve, compressor, and coil take the load of that. Homes in Scotland County, MO run heat about eight months a year, from October through May. Cold outdoor air forces the compressor to work harder to extract heat, and in a county where heating runs this long, those components reach diagnosis before the refrigerant lines or the air handler does. A contractor called out for a repair will check the reversing valve and compressor first, because that is where the accumulated cycling shows.

Ductwork fitted for one system and pressed into service for another carries problems that only show up once a heat pump is open and running poorly. Half the homes in Scotland County, Missouri were built in 1971 or earlier (2020-2024 ACS 5-year). A refrigerant charge that looks wrong at the unit can trace back to duct leakage pulling against the system, and a contractor who replaces the component without checking the duct runs will hand the homeowner a repair that repeats. The parts a heat pump takes are what they are; what the ducts around it have become after decades of use is the variable that changes the scope.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is where most repair calls begin. It houses the compressor, which drives the whole system, and the condenser coil, which sheds or absorbs heat depending on the season. When either one fails, the system stops doing its job. The refrigerant lines running between the outdoor unit and the house are checked alongside them, since a leak there affects everything downstream.
Inside the house, the air handler holds the evaporator coil and the blower motor. The coil handles the heat exchange indoors, and the blower pushes conditioned air through the house. The reversing valve, which sits in the outdoor unit, is the piece that lets a heat pump work in both directions. It is a common focus when a system heats in one season and fails in the other.
The drawing shows a typical layout, and a licensed contractor determines which components apply to your specific system and situation.
Find a contractor in Scotland CountyScotland County by the Numbers
86 severe weather events were recorded in Scotland 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 Scotland County, Missouri were built in 1971 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesScotland County, Missouri holds 2,201 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 Scotland County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Scotland County
Weather puts a measurable load on heat pump systems, and that load is local. A unit working through Scotland County's conditions takes on stress that shows up over time as wear, and repair needs reflect what the equipment has been through.
86 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.