Heat pumps provide both heating and cooling — when they fail, they take both functions offline. Local contractors diagnose and repair heat pump systems across Durham and Durham County year-round.
Durham built its identity on tobacco, and the massive American Tobacco Historic District downtown, once the world's largest tobacco manufacturing complex, has been redeveloped into offices and residences while still visibly carrying that industrial-era brick architecture. Duke University's campus and medical center anchor the city's modern economy alongside its Research Triangle Park partnership with Raleigh and Chapel Hill, and Durham's housing stock spans that full arc, historic tobacco-warehouse-district lofts and early-20th-century mill-village homes near downtown, alongside newer construction built out as the university and research economy expanded. Durham's Piedmont summers bring the same sustained heat and humidity common across central North Carolina, and the older tobacco-era housing stock, much of it originally built without central air at all, now carries HVAC systems retrofitted at varying points over the decades, which means service calls here often trace back to an aging or mismatched system as much as to simple equipment failure.
Heat Pump Problems We Fix
Common heat pump failures include reversing valve problems that prevent the system from switching between heating and cooling modes, refrigerant leaks, defrost board failures that cause ice buildup on the outdoor unit, compressor issues, and auxiliary heat problems. Heat pump diagnostics require specialized knowledge of the refrigerant cycle in both directions.
System runs constantly but never quite reaches the set temperature
This often points to a refrigerant or airflow issue rather than a thermostat problem — a technician can check charge levels and airflow before assuming the system itself is undersized.
Outdoor unit is covered in ice, even when it's not especially cold out
Some frost during a normal defrost cycle is expected, but heavy ongoing ice buildup usually means the defrost cycle isn't completing correctly or airflow is restricted.
Noticeably higher electric bills with no change in usage habits
A system working harder than it should to hit the same comfort level is a common early sign of a developing mechanical issue, often before anything sounds or feels obviously wrong.
Heat Pump vs. Furnace in Triangle
In Triangle's climate, heat pumps are efficient down to certain outdoor temperatures, after which auxiliary or emergency heat takes over. If your heat pump is running but not keeping up in cold weather, the issue may be with the auxiliary heat source rather than the heat pump itself. The technician checks the full system.
- Age alone is not a reason to replace. A twelve-year-old heat pump needing a capacitor should be repaired; the same unit needing a compressor is a different question.
- The refrigerant the system uses matters. Units built for R-22 are increasingly expensive to recharge, which can make an otherwise repairable leak uneconomical.
- How long you intend to stay in the house is a legitimate input, since replacement pays back over years of operation and that payback does not transfer cleanly at sale.
- Replacing the outdoor unit alone while keeping an older indoor coil is sometimes offered and is usually a poor match, because mismatched components rarely deliver the rated efficiency.
- If the house has never been comfortable, replacement without a load calculation and a look at the ductwork tends to reproduce the original problem in newer equipment.
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Call (336) 733-7039This content is reviewed by the North Carolina HVAC Repairs editorial team and informed by licensed-contractor sourcing, manufacturer documentation, and established industry standards for HVAC repair. Read our editorial standards.