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On a heat pump in this county, the contractor's first look goes to the reversing valve and the refrigerant circuit. Homes in Walla Walla County, WA run heat about eight months a year, from October through May. Heating mode is harder on those components than cooling mode, because capacity drops as outdoor temperatures fall and the compressor has to work longer cycles to meet the thermostat. When a repair comes in, the wear pattern in the reversing valve and the low-pressure side of the circuit will usually point straight at how many heating seasons the system has already run.
Ductwork in a house this old has already outlasted at least one prior system, which means the equipment a contractor opens today was chosen to fit what the house already had, not built alongside it. Half the homes in Walla Walla County, Washington were built in 1973 or earlier (2020-2024 ACS 5-year). A heat pump installed into that inherited infrastructure draws on parts from a manufacturer's line that may itself be a generation deep. When the compressor or reversing valve fails, the question a contractor is answering is whether the replacement part still has an active supply chain, or whether this repair is the last one the system can take.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits on a pad beside the house and holds the compressor and condenser coil. These are where most faults show up. A failed compressor means no heat transfer at all. A damaged or dirty coil means the system strains and often short-cycles or stops cooling or heating to temperature.
Inside the house, the air handler holds the evaporator coil and the blower fan, which pulls conditioned air through the home. The reversing valve connects both sides of the system and is what lets a heat pump switch between heating and cooling. When that valve sticks or fails, the system locks into one mode and will not switch.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which parts apply and what work is needed in your specific home.
Get matched in Walla Walla CountyWalla Walla County, by the numbers
106 severe weather events were recorded in Walla Walla County, Washington 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 Walla Walla County, Washington were built in 1973 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWalla Walla County, Washington holds 25,422 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 65.0% of the occupied homes in Walla Walla County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Governing Heat Pump Repair in Walla Walla County, Washington1 sourced rules & standards
Licensing Rules for HVAC Work in Walla Walla County, Washington
Washington requires contractor registration rather than an HVAC licence: every contractor must register with the Department of Labor and Industries, and advertising, bidding or working as a contractor without that registration is a gross misdemeanour.
Severe Weather Events in Walla Walla County, Year by Year
Extreme weather puts real stress on heat pump systems, pushing them harder and wearing components faster. How often that pressure arrives in Walla Walla County shapes how much repair work local equipment actually needs.
106 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.