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A contractor diagnosing a heat pump here has to account for what the refrigerant circuit, the reversing valve, and the defrost board have already been through before they can isolate what failed. Homes in Lewis County, WA run heat about ten months a year, from September through June. Cold outdoor air pushes a heat pump harder than any other kind of heating equipment, because capacity drops exactly when the house needs more of it, and the defrost cycle kicks in repeatedly through a long, wet Pacific Northwest winter. Parts that are borderline in October are failed by March. When a repair call comes in, a contractor checks the refrigerant charge and the defrost controls first, because those are what the season grinds on.
Half the homes in Lewis County, Washington were built in 1980 or earlier (2020-2024 ACS 5-year). A heat pump running in a house that old has often been retrofitted at least once, and what a contractor finds inside an opened unit reflects that layered history: a compressor or reversing valve may carry wear that factory specs for a current replacement do not quite match, and sourcing a part that fits the existing refrigerant circuit takes more than a catalog lookup. Some components are still available. Others require a contractor to cross-reference discontinued lines or source from a specialty supplier, which changes both the timeline and the quote before a single bolt is turned.
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 look at early in a repair call because it drives the whole system. A failing compressor shows up as a unit that runs but moves no heat, or one that trips its breaker and shuts down.
The air handler sits inside, usually in a closet, attic, or basement, and it contains the evaporator coil and the blower that pushes conditioned air through the house. The reversing valve, which lives in the outdoor unit, tells the system which direction to move heat. The expansion valve and refrigerant lines connect the two units, and a refrigerant leak or a stuck expansion valve are the kinds of faults that show up in both locations at once.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which pieces and which conditions apply to your specific house.
Get matched in Lewis CountyLewis County, by the numbers
Half the homes in Lewis County, Washington were built in 1980 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLewis County, Washington holds 36,512 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 75.8% of the occupied homes in Lewis County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Behind Heat Pump Repair in Lewis County, Washington1 sourced rules and standards
What Lewis County and Washington Require for HVAC Repair
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.