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Sizing a heat pump for Clark County starts with how cold it actually gets, because capacity drops as outdoor temperatures fall and the system has to carry the load through its hardest months without stalling. Homes in Clark County, WA run heat about nine months a year, from October through June. A contractor calculating the right equipment for this house sets a balance point, the outdoor temperature below which the heat pump alone cannot keep up, and then decides whether supplemental heat is needed and what form it takes. Get that calculation wrong at installation and the backup runs far more than it should, driving up bills and wearing components that were meant for occasional use.
Ductwork sized for a furnace moves air differently than a heat pump needs it to. Half the homes in Clark County, Washington were built in 1993 or earlier (2020-2024 ACS 5-year). That matters for installation because a heat pump's airflow requirements can expose sizing and sealing problems that were never an issue with the equipment the ducts were built around. A contractor installing a heat pump in this county has to look at what is already in the walls before the new unit can be quoted, because the duct system is where the job either works or gets complicated.
What Gets Installed With a New Heat Pump
The outdoor unit sits on a pad beside the house and holds the compressor and the condenser coil, which are the heart of the system. Inside, the air handler mounts in a utility space, basement, or closet and moves conditioned air through the home. Together these two units do the work the old furnace and air conditioner once split between them.
A refrigerant line set runs between the outdoor unit and the air handler, carrying the working fluid back and forth through insulated copper tubing. A thermostat goes on an interior wall where it reads the temperature and tells the system when to run. Both pieces are part of what a contractor installs alongside the main equipment.
The drawing shows a typical layout, and a licensed contractor will assess what applies to your specific house.
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 EstimatesRules and Standards for Heat Pump Installation in Clark County, Washington1 sourced rules and standards
What Clark County, Washington Requires for This Work
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.