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Sizing a heat pump for this address means accounting for what the compressor is asked to carry on a February night, not just the shoulder-season average. Homes in Whatcom County, WA run heat in every month of the year. A contractor quoting an install here has to work out both the peak load and where outdoor temperatures push the unit below its rated capacity, because that gap is where a poorly sized system fails the homeowner first. Back-up heat is a local question, not a standard add-on, and getting that decision right at installation is what keeps the system usable on the hardest days.
Ductwork laid down for a furnace was not designed around the airflow a heat pump needs, and in Whatcom County that gap shows up on the job. Half the homes in Whatcom County, Washington were built in 1989 or earlier (2020-2024 ACS 5-year). A contractor quoting a heat pump installation here opens wall cavities and crawlspaces to find out whether the existing trunk lines and branch runs will carry the new system's volume, and whether the electrical service at the panel has the capacity the new unit draws. Those two questions, answered before anything is ordered, are what set the real scope of the job.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece a homeowner sees first, mounted on a pad beside the house, and it holds the compressor and the main coil that does the work of moving heat. Inside, an air handler goes in a utility closet, basement, or attic and pushes conditioned air through the home. Together these two units are the core of what a contractor sets in place.
A refrigerant line set runs between the outdoor unit and the air handler, connecting the two through a small penetration in the wall. A thermostat goes on an interior wall where it can read the living space accurately, and a disconnect box lands on the exterior wall near the outdoor unit to give the system a dedicated shutoff point.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece is positioned and connected in your specific home.
Get matched in Whatcom CountyWhatcom County by the numbers
Half the homes in Whatcom County, Washington were built in 1989 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWhatcom County, Washington holds 103,520 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 63.7% of the occupied homes in Whatcom County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules for Whatcom County, Washington1 sourced standards and codes
Licensing and Legal Requirements in Whatcom 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.