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Sizing a heat pump for this address starts with what the equipment will be asked to do when outdoor temperatures drop hardest. Homes in Thurston County, WA run heat about ten months a year, from September through June. A heat pump's output falls as the air outside gets colder, so the coldest weeks of that long run are the ones that expose an undersized system. A contractor has to establish the home's heat loss at design temperature, then match it against the performance curve of any unit under consideration, before a quote means anything. Back-up resistance heat is not an afterthought here; it is part of the answer to what happens when ambient temperatures push against the limits of the refrigerant cycle.
Ductwork sized and routed for an earlier generation of heating equipment shapes what a contractor runs into on heat pump jobs here. Half the homes in Thurston County, Washington were built in 1991 or earlier (2020-2024 ACS 5-year). Ducts built for a gas furnace move air at a different pressure and volume than a heat pump needs, and a contractor doing an installation has to assess whether what is in the house can carry the new system before pricing anything else. If the ducts cannot, the scope of the job changes. The electrical panel gets its own look, too, since the draw of a heat pump differs from whatever the existing service was sized around.
What Gets Installed With a New Heat Pump
The outdoor unit sits on a concrete pad or wall bracket outside the house and holds the compressor and one set of coils. Inside, the air handler mounts in a utility closet, attic, or basement and moves conditioned air through the home. These two units are what a homeowner sees after the work is done.
A pair of refrigerant lines, one insulated, run between the outdoor unit and the air handler and carry the working fluid back and forth. The thermostat goes on an interior wall where it reads the living space and signals both units when to run. A condensate drain line runs from the air handler to a nearby drain to carry off moisture pulled from the indoor air.
The drawing shows a typical layout, and a licensed contractor determines what configuration fits your specific house.
Get matched in Thurston CountyThurston County, by the numbers
2 severe weather events were recorded in Thurston 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 Thurston County, Washington were built in 1991 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesThurston County, Washington holds 125,163 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 67.7% of the occupied homes in Thurston County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules on the Books for Thurston County, Washington1 codes, standards, and licensing rules
Licensing and Legal Requirements in Thurston 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.