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On a heat pump repair call in Jefferson County, a contractor looks first at the compressor and the reversing valve, because those components cycle through every cold snap from October to April. Homes in Jefferson County, KS run heat about seven months a year, from October through April. The heat pump works hardest precisely when outdoor temperatures drop and its capacity shrinks, so the compressor is under its greatest strain during the coldest weeks. By the time a fault shows, those components have already built up a long history of cold-weather starts. A contractor diagnosing the system here checks the refrigerant charge and the reversing valve operation early, because heat-pump failures in a long heating season rarely trace back to the cooling side.

Heat pump systems installed into older housing stock tend to outlast the supply chains built around them. Half the homes in Jefferson County, Kansas were built in 1979 or earlier (2020-2024 ACS 5-year). A contractor who opens a unit and finds a failed reversing valve or a cracked accumulator is then working out whether that part is still in production, not just what the part costs. When a manufacturer has discontinued a component, the repair either waits on a specialty supplier or pivots to a workaround the original design did not anticipate. That parts question is what shapes the repair scope here.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit sits outside the house and holds the compressor and the outdoor coil. These are where a contractor starts when a heat pump stops moving heat properly. A failed compressor, a refrigerant leak at the coil, or a seized fan motor in that cabinet are among the first things a technician rules in or out.
The air handler lives inside, usually in a closet, attic, or basement, and it circulates conditioned air through the home. The expansion valve and the reversing valve sit within the refrigerant circuit and control how refrigerant moves between the two units. A fault in either of those valves shows up as the system heating or cooling on only one mode, or not at all.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines exactly which components apply to your house.
Find a contractor in Jefferson CountyJefferson County, Kansas, by the numbers
193 severe weather events were recorded in Jefferson County, Kansas 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 Jefferson County, Kansas were built in 1979 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesJefferson County, Kansas holds 8,038 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 85.7% of the occupied homes in Jefferson County, Kansas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Jefferson County
Extreme weather puts heat pumps under stress, and how hard that stress runs depends on where the equipment sits. Repair needs in Jefferson County reflect what the climate actually does here, which is why local weather history belongs alongside local service.
193 severe weather events, 2016–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.