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Sizing a heat pump for San Juan County starts with one question: how much heating capacity the unit can actually deliver when outdoor temperatures drop lowest, because that is exactly when demand is highest. Homes in San Juan County, UT run heat about eight months a year, from October through May. A heat pump loses output as the air outside gets colder, so a unit that tests fine on a mild day can fall short on the hard ones. That gap is what makes back-up heat a real consideration here, not a sales add-on, and a contractor who skips the cold-weather capacity calculation will size the primary unit against the wrong load. The ductwork, the service panel, and the back-up heat source all follow from getting that number right.

Ductwork laid down for an earlier generation of equipment does not automatically carry what a heat pump draws today. Half the homes in San Juan County, Utah were built in 1986 or earlier (2020-2024 ACS 5-year). For a contractor quoting a heat pump installation here, that gap shapes the job from the first site visit: the existing runs have to be measured for flow, and the service panel has to be checked for capacity, before a unit is chosen. What those measurements turn up determines the scope more than the equipment itself does.
What to Know About a Heat Pump Before Installation

The outdoor unit is the piece most homeowners see first, sitting on a concrete pad or wall bracket outside the house. It holds the compressor and the outdoor coil, and it is the heart of the system. Inside, the air handler mounts in a utility closet, attic, or basement and moves conditioned air through the home.
A refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing. A thermostat on an interior wall ties the whole system together, reading the home's temperature and telling the equipment when to run.
The drawing beside this text shows the general layout of these components, and a licensed contractor determines exactly how they apply to your house.
Get matched in San Juan CountySan Juan County, Utah, by the numbers
108 severe weather events were recorded in San Juan County, Utah 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, Utah were built in 1986 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSan Juan County, Utah holds 5,679 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 80.9% of the occupied homes in San Juan County, Utah (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules for San Juan County, Utah2 codes, standards, and laws
Licensing Rules for San Juan County, Utah
Utah’s contractor licence does not reach alteration, repair, remodelling or improvement of a building worth less than $7,000 in labour and materials together, counting every change and addition to the agreed work — though the plumbing and electrical trades are pulled back under licensure even below that figure.
Utah requires a state licence before engaging in a licensed construction trade or contracting activity, and HVAC contractor is one of the licence classifications the state issues.
Severe Weather Events in San Juan County
Weather puts a load on heating and cooling equipment, and that load shapes what a heat pump here has to handle year after year. Sizing and installing the right system is a local decision, and the conditions this county sees are part of that picture.
108 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.
