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On a repair call here, a contractor starts with the refrigerant circuit and the reversing valve before looking at anything else. Homes in Mohave County, AZ run heat about six months a year, from November through April. A heat pump pushed through a full heating season accumulates more cycling hours on those components than most homeowners account for, and small faults in the reversing valve or refrigerant charge show up as capacity loss well before they trip an error code. The contractor has to establish the system's actual condition under load, because a pressure reading at rest tells very little about what it was doing on a cold January night.
Ductwork in a house this old has run through at least one full equipment cycle, and what it has accumulated, collapsed sections, deteriorating seals, restricted airflow at the registers, shapes what a contractor finds once a heat pump is opened for repair. Half the homes in Mohave County, Arizona were built in 1995 or earlier (2020-2024 ACS 5-year). That history means a refrigerant charge that keeps dropping, or a system that short-cycles, can trace back to duct losses rather than anything in the unit itself. A contractor working a repair here checks static pressure and duct condition alongside the mechanical components, because the sealed system and the delivery network are both candidates.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits on a pad outside the house and holds the compressor and the condenser coil. The compressor is where most repair calls begin. When it fails, the system runs but moves no heat; when the condenser coil is fouled or damaged, the same symptom follows.
Inside, the air handler holds the evaporator coil and the blower that pushes conditioned air into the house. The expansion valve sits between the two coils and meters refrigerant flow. A refrigerant line set connects the indoor and outdoor sides, and a reversing valve inside the outdoor unit switches the system between heating and cooling.
The drawing shows a representative layout, and a licensed contractor determines which components apply and what attention each one needs in your specific home.
Find a contractor in Mohave CountyMohave County, by the numbers
194 severe weather events were recorded in Mohave 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 Mohave County, Arizona were built in 1995 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMohave County, Arizona holds 121,881 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 74.1% of the occupied homes in Mohave County, Arizona (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Heat Pump Repair in Mohave County, Arizona1 sourced rules and standards
Licensing Rules That Apply to HVAC Repair in Mohave 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 Mohave County
Extreme weather puts heat pumps under stress, and how hard a system works over its lifetime depends heavily on local conditions. Repair frequency, part wear, and the demands placed on components are all shaped by what the weather here actually does.
194 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.