Heat pumps provide both heating and cooling — when they fail, they take both functions offline. Get connected with technicians who diagnose and repair heat pump systems across Nashville and Davidson County year-round.

Nashville sits along a bend of the Cumberland River in the middle of the state, and its housing stock reflects more than two centuries of growth — narrow shotgun houses and Victorian-era homes in neighborhoods like Germantown and East Nashville, brick bungalows from the city's early-1900s streetcar-suburb boom, and dense new construction downtown and around the Gulch as the city's population has surged in recent years. Middle Tennessee's climate runs hot and humid from May through September, with summer heat indexes regularly pushing air conditioners into near-continuous operation, then swings into genuinely cold winter stretches with occasional ice events that put furnaces and heat pumps to the opposite test. That range means Nashville homeowners generally need a system that performs well at both ends of the year, and it's part of why HVAC repair calls here run steadily across every season rather than clustering in just one.

Heat Pump Problems

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 Middle Tennessee

In Middle Tennessee'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. Technicians check the full system.

  • Auxiliary heat running during genuinely cold weather. That is the system doing what it was designed to do, and no repair removes the cost of it.
  • A bill driven by rate changes, occupancy, or water heating rather than the heat pump. Comparing against the same month a year earlier is the cheapest first check and costs nothing.
  • Building heat loss from thin insulation or leaky ducts. A repair restores equipment performance; it does not reduce how much heat the house loses.
  • A thermostat simply set higher than it used to be, since each degree of setpoint raises runtime regardless of equipment condition.
  • Comfort problems in a house where the equipment was undersized at installation, which no component-level repair will change.

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This content is reviewed by the Tennessee HVAC Repair editorial team and informed by licensed-contractor sourcing, manufacturer documentation, and established industry standards for hvac repair. Read our editorial standards.