Tell us about the job
Takes about a minute. No obligation.
A heat pump running in heating mode works its reversing valve and refrigerant coils hard every time it cycles, and in this county it cycles a long time. Homes in Coconino County, AZ run heat about eight months a year, from October through May. By late winter, a system that was borderline at installation has already accumulated enough switching cycles that the reversing valve starts to stick or bleed pressure between modes. A contractor diagnosing a heat pump here pulls refrigerant readings and cycles the reversing valve before looking at anything else, because those are the parts the heating season wears through first.
Half the homes in Coconino County, Arizona were built in 1991 or earlier (2020-2024 ACS 5-year). A system running in stock that old has likely been through at least one equipment swap, and the unit a contractor opens today may be drawing on ductwork and wiring that was configured for something different. What that produces, on a repair call, is a parts question. The compressor, reversing valve, or control board a contractor pulls out may belong to a line that has been discontinued, and what ships as a replacement does not always fit the existing configuration without additional work.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits on a pad beside the house and holds the compressor, which is the piece contractors reach for first when a heat pump stops working the way it should. The coil wrapped around that unit and the fan above it are checked alongside it, since a bent fin or a seized fan motor can mimic a failing compressor.
Inside the house, the air handler hangs in a closet, attic, or utility room and moves conditioned air through the home. The reversing valve inside it is the part that lets a heat pump heat and cool, and when it sticks, the system delivers the wrong temperature regardless of what the thermostat says. The refrigerant line set running between the two units and the expansion valve that meters refrigerant flow are also on a contractor's checklist.
The drawing shows a typical layout, and a licensed contractor determines which parts apply to your specific system and home.
Find a contractor in Coconino CountyCoconino County, by the numbers
396 severe weather events were recorded in Coconino County, Arizona 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 Coconino County, Arizona were built in 1991 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCoconino County, Arizona holds 70,645 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 59.7% of the occupied homes in Coconino County, Arizona (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Repair Rules for Coconino County, Arizona1 sourced rules and codes
Licensing Rules for HVAC Repair in Coconino County, Arizona
Arizona requires a contractor licence in good standing: it is unlawful to engage in the business of contracting, to bid, or to act or hold yourself out as a contractor without one.
Severe Weather Events in Coconino County
Extreme weather puts real strain on heat pump systems, which have to work harder and longer to hold a steady indoor temperature when outdoor conditions swing hard. How often that happens in Coconino County shapes how much wear local equipment takes and how frequently repair work becomes necessary.
396 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.