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Sizing a heat pump for this house is where the install either holds up or doesn't. Homes in Washington County, OR run heat about nine months a year, from October through June. A heat pump loses capacity as outdoor temperatures drop, so a contractor has to run a room-by-room load calculation and check what supplemental heat the backup strip or dual-fuel setup can cover when the system reaches its balance point. Get the sizing wrong and the equipment runs at or near its limit through most of the heating season, which accelerates wear on the compressor and the reversing valve long before a shorter-season install would show the same strain.
Existing ductwork is where a heat pump installation either fits or fights. Half the homes in Washington County, Oregon were built in 1990 or earlier (2020-2024 ACS 5-year). A house built in that window was ducted around whatever heating system was standard at the time, and when a contractor comes in to install a heat pump, the question is whether those ducts move the right volume of air to the right rooms. If the answer is no, the duct system gets corrected before anything else, and that work shapes the scope of the job more than the unit selection does. The electrical service gets its own look as well, since a heat pump's draw has to be matched against what the panel actually carries.
What Gets Installed With a New Heat Pump
The outdoor unit sits on a pad beside the house and holds the compressor and the coil that exchange heat with the outside air. The indoor air handler mounts inside, usually in a utility closet, basement, or attic, and pushes conditioned air through the home. These two units are what the contractor sets in place first.
A refrigerant line set runs between the outdoor unit and the air handler, connecting the two through an exterior wall. A thermostat goes on an interior wall where it can read the living space accurately and give the homeowner control over the whole system. A condensate drain line also runs from the air handler to carry away moisture the coil pulls from the air.
The drawing shows a typical layout, and a licensed contractor determines what fits your specific house.
Get matched in Washington CountyWashington County, Oregon, by the numbers
7 severe weather events were recorded in Washington County, Oregon 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 Washington County, Oregon were built in 1990 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWashington County, Oregon holds 243,278 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 60.8% of the occupied homes in Washington County, Oregon (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Heat Pump Installation in Washington County, Oregon2 sourced rules and standards
Licensing and Legal Requirements in Washington County, Oregon
Oregon’s contractor licence does not reach casual, minor or inconsequential work on one structure where the person’s contracts total less than $1,000 — and the exemption is unavailable to anyone who advertises or signs themselves as a contractor, at any price.
Oregon requires a current Construction Contractors Board licence, with the right endorsement, to undertake, offer to undertake or bid construction work.