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 Hendersonville and Sumner County year-round.

Hendersonville's stretch of Old Hickory Lake shoreline was home to Johnny Cash and June Carter Cash for decades at their House of Cash estate, part of a mid-century wave of Nashville musicians who built lake houses here once the reservoir was completed in the 1950s — a legacy that still shapes how the city thinks of itself relative to its more corporate-feeling neighbors closer to Nashville. Volunteer State Community College anchors part of the city's more recent institutional growth. Housing near the lakefront tends to be older, built up through the 1960s and 70s during that first wave of lake development, while subdivisions further from the water reflect the area's more recent growth as a Nashville commuter suburb, giving Hendersonville a noticeably different housing-age pattern near the shoreline than a few miles inland.

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.