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A heat pump in this area runs its heating cycle hard, and the reversing valve, refrigerant circuit, and outdoor coil carry most of that load. Homes in Cole County, MO run heat about seven months a year, from October through April. Capacity drops as outdoor temperatures fall, so the compressor works harder in the coldest weeks than the nameplate suggests. A contractor diagnosing a fault here checks the reversing valve and refrigerant charge before moving to electrical components, because those are the parts that accumulate wear across a long heating season.

Ductwork in a house old enough to sit on the earlier side of this county's housing distribution was laid out for equipment that is almost certainly gone now, and the connections between that original infrastructure and whatever runs in it today are where heat pump repairs get complicated. Half the homes in Cole County, Missouri were built in 1982 or earlier (2020-2024 ACS 5-year). A contractor who opens a heat pump in stock like this frequently finds refrigerant lines rerouted around a previous configuration, or electrical runs extended in ways that affect how the system behaves under load. The repair the homeowner called about and the repair a contractor prices once the unit is open are often two different jobs.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is the piece most homeowners recognize: a metal cabinet set on a pad beside the house. Inside it sit the compressor and the outdoor coil. The compressor is the part that does the hardest work, and when a heat pump stops heating or cooling altogether, that cabinet is where a contractor looks first.
Inside the house, the air handler holds the indoor coil and the blower fan. The indoor coil moves heat into or out of the air stream, and the blower pushes that air through the house. The refrigerant line set, a pair of copper lines running between the two units, ties the whole system together, and a fault anywhere along it shows up as a performance problem at both ends.
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 home.
Find a contractor in Cole CountyCole County, Missouri, by the numbers
45 severe weather events were recorded in Cole 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 Cole County, Missouri were built in 1982 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCole County, Missouri holds 33,533 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 67.9% of the occupied homes in Cole County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Cole County
Storms, extreme cold, and heat put hours on a heat pump that a mild climate never would. Repair needs in Cole County track directly with what the weather demands of the equipment.
45 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.