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A heat pump working a long heating season puts sustained stress on the reversing valve, the refrigerant circuit, and the coils that have to extract heat from cold outdoor air. Homes in Washington County, CO run heat about eight months a year, from October through May. Capacity drops as temperatures fall, so the system works harder at the exact moment it is least efficient, and that is where wear accumulates. A contractor called out for a repair here looks at the reversing valve and the coil condition before anything else, because those components carry the load every time outdoor temperatures push the unit toward its lower operating limit.

Ductwork in a house this old was put in for something other than what runs in it now. When a repair opens the system, what a contractor finds in the air handler or the refrigerant lines reflects decades of successive adaptation, not a single coherent installation. Half the homes in Washington County, Colorado were built in 1958 or earlier (2020-2024 ACS 5-year). That history shows up as spliced duct runs, field modifications at the disconnect, and refrigerant fittings from a previous service. Parts for a heat pump that has been running through all of that are still available for some vintages and not others, and the answer depends on what the serial plate actually says, not on what the house looks like from the street.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit sits outside the house and holds the compressor and the condenser coil. The compressor is the part contractors go to early when a heat pump stops heating or cooling as it should. The condenser coil wraps around it, and a refrigerant leak or a damaged coil shows up here.
Inside the house, the air handler moves conditioned air through the home and contains the evaporator coil and the blower motor. The reversing valve, which lives in the outdoor unit, tells the system which direction to run, and a failed valve is a common reason a heat pump gets stuck in one mode. The expansion valve and the refrigerant lines that connect both units are also on a contractor's checklist when the system is underperforming.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which parts apply to your specific house and situation.
Get matched in Washington CountyWashington County, Colorado, by the numbers
350 severe weather events were recorded in Washington County, Colorado 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 Washington County, Colorado were built in 1958 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWashington County, Colorado holds 2,287 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.6% of the occupied homes in Washington County, Colorado (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Washington County
Extreme weather puts heat pumps under load at the moments they are least able to absorb it. How hard a system has to work, and how often it is pushed to its limits, shapes what wears out and when a repair call becomes necessary.
350 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.
