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Sizing a heat pump for this county starts with how long the heating load actually runs. Homes in San Juan County, WA run heat about ten months a year, from September through June. A compressor cycling through that kind of sustained demand accumulates wear on its refrigerant circuit and its reversing valve in a way a short season never produces. Cold outdoor temperatures reduce a heat pump's capacity at precisely the moment the house needs it most, so a contractor has to establish the correct backup heat threshold before the install, not after. A unit that enters service undersized will run longer hours to hold temperature, and the parts that cycle most will reach their limits well before the warranty conversation comes up.
Ductwork put in for one generation of heating equipment does not automatically carry what a heat pump asks of it. Half the homes in San Juan County, Washington were built in 1988 or earlier (2020-2024 ACS 5-year). That span between when the house was built and what a contractor installs today is where the real variables sit: duct sizing, routing, and whether the existing electrical service handles the load a heat pump draws. A contractor scoping a job in this county opens those questions before the equipment gets priced.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece a homeowner sees first: a metal cabinet set on a concrete pad or wall brackets outside the house, holding the compressor and one set of coils. The indoor air handler mounts inside, most often in a utility closet, basement, or attic, and it moves conditioned air into the living space.
A refrigerant line set runs between the two units, carrying the working fluid through insulated copper tubing that passes through a small penetration in the wall. A thermostat goes on an interior wall where it reads the temperature of the living space and tells the system when to run.
The drawing shows the general layout of these components, and a licensed contractor determines exactly how each one is placed and connected in your specific home.
Get matched in San Juan CountySan Juan County, by the numbers
54 severe weather events were recorded in San Juan 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 San Juan County, Washington were built in 1988 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSan Juan County, Washington holds 13,990 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.0% of the occupied homes in San Juan County, Washington (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLicensing, Efficiency, and Installation Rules for Heat Pump Work in San Juan County, Washington1 sourced standards and codes
Licensing and Legal Requirements in San Juan 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.
Severe Weather Events in San Juan County
Weather puts a measurable load on heating and cooling equipment, and that load varies by location. How hard a heat pump works over its life depends in part on what the climate around it actually does, which makes local weather history a practical starting point for sizing and installation decisions.
54 severe weather events, 2015–2022. Source: NOAA National Centers for Environmental Information, Storm Events Database.