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A contractor quoting a heat pump installation in Cowlitz County has to get the sizing right before anything else matters. Homes in Cowlitz County, WA run heat about ten months a year, from September through June. A system that is undersized for that demand runs at or near its limit through the cold months, and the compressor accumulates wear in a way that a system with headroom does not. Backup heat also has to be specified correctly here, because a heat pump's output drops as outdoor temperatures fall, and the heating season is long enough that under-specifying it becomes a real problem the homeowner will notice.
Ductwork laid down for a furnace or a baseboard-era house was designed around a different kind of airflow entirely. Half the homes in Cowlitz County, Washington were built in 1976 or earlier (2020-2024 ACS 5-year). That generation of supply and return runs was sized for what the original equipment moved, and a heat pump moves air differently, at lower temperatures and higher volumes. A contractor quoting a heat pump installation here opens the crawlspace or the ceiling cavity first, before the equipment gets priced, because the ductwork is where the job either straightforward or expensive. The electrical panel draws the same scrutiny: older service panels were not provisioned for the load a heat pump puts on them.
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. This is the piece most homeowners recognize from the outside. Inside, the air handler mounts in a utility space, closet, or attic and circulates conditioned air through the home.
A refrigerant line set runs between the two units, carrying the working fluid back and forth through insulated copper tubing. The thermostat goes on an interior wall and gives the homeowner control over the whole system. Some installations also include a supplemental electric resistance strip inside the air handler for the coldest days.
The drawing shows a typical layout, and a licensed contractor determines what fits the specific configuration of your house.
Get matched in Cowlitz CountyCowlitz County, by the numbers
14 severe weather events were recorded in Cowlitz 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 Cowlitz County, Washington were built in 1976 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCowlitz County, Washington holds 46,422 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 68.0% of the occupied homes in Cowlitz County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules for Cowlitz County, Washington1 sourced codes and standards
Licensing and Legal Requirements in Cowlitz 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.