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A heat pump running in heating mode is doing its harder work, pulling heat out of cold outdoor air and moving it inside. Homes in Clark County, WA run heat about nine months a year, from October through June. The refrigerant circuit, the reversing valve, and the defrost board cycle repeatedly across those months, and that is where wear concentrates. When a system fails here, a contractor checks those components first rather than treating the call as a generic breakdown. Coil condition and refrigerant charge tell the actual story of how the system has been performing under that sustained heating load.
Refrigerant lines and the electrical supply feeding a heat pump are often the part of a repair that takes the most time to sort out. Half the homes in Clark County, Washington were built in 1993 or earlier (2020-2024 ACS 5-year). A house in that range of the distribution was built for a system that has since been replaced, and the connections between the structure and whatever now runs in it were adapted along the way rather than designed for it from the start. When a contractor opens the unit, what they are also checking is whether those adapted connections are up to what the current system asks of them, because a weak link there changes the repair scope and sometimes the parts list.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits on a pad outside the house and holds the compressor and the condenser coil. The compressor is the heart of the system, and when it fails, the heat pump stops moving heat entirely. The condenser coil, which wraps around the inside of that cabinet, is where a contractor often looks early, since a damaged or dirty coil forces everything else to work harder.
Inside the house, the air handler holds the evaporator coil and the blower fan that pushes conditioned air through the home. The reversing valve, which sits in the outdoor unit, is what lets the system run in both heating and cooling mode, and a stuck or failed valve is a repair a contractor will test for when the system runs in only one direction. The expansion valve and refrigerant lines connect the two units and are checked when pressures or temperatures read outside the expected range.
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 Clark CountyClark County, by the numbers
13 severe weather events were recorded in Clark 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 Clark County, Washington were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesClark County, Washington holds 204,375 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 66.4% of the occupied homes in Clark County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Heat Pump Repair in Clark County, Washington1 sourced rules and standards
Licensing Rules for HVAC Repair in Clark 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.