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A heat pump running heating duty is working at reduced capacity whenever outdoor temperatures drop hard, and that puts steady mechanical load on the reversing valve and the refrigerant circuit. Homes in Salt Lake County, UT run heat about eight months a year, from October through May. The compressor in heating mode cycles more frequently when outdoor air is cold because the system has to work harder to pull usable heat from it. A contractor diagnosing a fault here checks the reversing valve before moving to other components, because that part carries the load of every switch between heating and cooling and wears accordingly.

Ductwork in much of this county was sized and sealed for whatever system the original builder put in, and heat pumps running in that ductwork have been compensating for its gaps ever since. Half the homes in Salt Lake County, Utah were built in 1986 or earlier (2020-2024 ACS 5-year). That history shows up inside the unit: compressor wear, refrigerant circuit stress, and contactor pitting that accumulate when a system works against a static pressure it was never quite matched to. A contractor opening a heat pump here checks those components first, because what the housing imposes on the equipment is the part of the diagnosis the age of the unit alone does not explain.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is where most repairs begin. It houses the compressor, which drives the whole system, and the coil that either pulls heat from outside air or sheds it there. When the compressor fails or the coil develops a leak, the unit runs but does nothing useful. A refrigerant line set connects that cabinet to the inside of the house.
Indoors, the air handler holds a second coil and the blower that moves conditioned air through the house. The reversing valve, which tells the system whether to heat or cool, sits in the refrigerant circuit and is a common repair target. The thermostat and the control board govern both sides, so a wiring or board fault can look like a mechanical failure until a contractor tests each component.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which parts apply to your specific installation.
Get matched in Salt Lake CountySalt Lake County, by the numbers
314 severe weather events were recorded in Salt Lake 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 Salt Lake County, Utah were built in 1986 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSalt Lake County, Utah holds 449,662 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 66.1% of the occupied homes in Salt Lake County, Utah (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRepair Rules for Heat Pumps in Salt Lake County, Utah2 codes, standards, and rules
Licensing and Legal Requirements in Salt Lake 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.
Weather Events in Salt Lake County That Stress HVAC Systems
Extreme weather puts heat pumps under load at the exact moments they are needed most. How hard a system works over its lifetime depends on what the local climate actually throws at it, and Salt Lake County has its own record.
314 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.
