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Sizing a heat pump for San Juan County is not a calculation a contractor can run from a national chart. Homes in San Juan County, CO run heat in every month of the year. At altitude and in sustained cold, a heat pump's output drops precisely when the house demands the most, which means the contractor has to establish where that crossover point sits and whether the backup heat load that covers it matches the service panel's capacity. A system undersized at installation leans on resistance strips from the first cold snap, and those strips consume far more power than the heat pump the homeowner paid for.

Ductwork laid in for an earlier generation of equipment shapes what a heat pump installation actually takes in this county. Half the homes in San Juan County, Colorado were built in 1979 or earlier (2020-2024 ACS 5-year). That means the runs already in the house were never designed around what a contractor is about to put in, and whether they can carry the new system's airflow and static pressure is the question that decides the scope of the job. Electrical service is part of that same audit. The house is the variable; the equipment comes after.
What Gets Installed With a New Heat Pump

The outdoor unit sits on a concrete pad or wall brackets outside the house and holds the compressor and one set of coils. Inside, an air handler mounts in a utility space, closet, or attic and moves conditioned air through the home. These two units are the core of what a contractor places.
A refrigerant line set runs between the outdoor unit and the air handler, passing through the wall to connect the two. A thermostat goes on an interior wall where it can read the living space accurately and give the homeowner control over the system.
The drawing shows the general layout of these components, and a licensed contractor determines what applies to this particular house.
Get matched in San Juan CountySan Juan County, by the numbers
95 severe weather events were recorded in San Juan County, Colorado 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, Colorado were built in 1979 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSan Juan County, Colorado holds 738 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 52.9% of the occupied homes in San Juan County, Colorado (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in San Juan County
Heat pump performance is tied directly to what the climate asks of it year after year. Weather stress on a system is a local fact, and sizing and installation choices in San Juan County should reflect what the equipment actually faces here.
95 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.