How long does a heat pump last?

By Dana Whitlock. Updated October 2026.

A heat pump never gets an off-season, and its lifespan shows it. The Department of Energy's central air conditioner and heat pump analysis gives split-system heat pumps average lifetimes of about 16.4 years in the North, 15.4 years in the hot-dry region and 15.1 years in the hot-humid region. A 2007 builders' study lists them at 16 years, and inspector charts at 10 to 15. Call it about 15 years for a typical air-source system. That's several years shorter than DOE's numbers for central air conditioners. Running in both summer and winter, a heat pump logs far more compressor hours. It also has parts an air conditioner lacks, such as the reversing valve and defrost controls. Climate, sizing, refrigerant charge and how clean the outdoor unit stays all push an individual system above or below the average.

What wears out

Compressor

The compressor moves refrigerant in both heating and cooling. Year-round use, frequent defrost cycles and low refrigerant charge all add wear. It is the most expensive component in the system, and its failure is the most common reason a heat pump is replaced rather than repaired.

Reversing valve

DOE explains that a reversing valve switches the refrigerant flow so the system can heat, cool and defrost the outdoor coil. A valve that sticks can leave the system stuck in one mode. Replacing it means opening the refrigerant circuit, which requires a certified technician.

Outdoor coil and defrost controls

In winter the outdoor coil gets cold enough to frost over, and the system periodically runs a defrost cycle to clear it. Failed defrost sensors or boards let ice build up, which cuts heating and stresses the compressor. The coil also collects dirt and debris that reduce efficiency in both seasons.

Indoor coil, blower and backup heat

The air handler's coil can leak, the blower motor can wear, and the electric backup heat strips can burn out. If the backup heat is doing most of the work, your bills will show it.

Refrigerant charge

DOE notes that split systems are charged in the field and can end up over- or under-charged, and either lowers efficiency. Leaks drop charge over time and push the compressor harder.

Signs it's near the end

• The outdoor unit stays coated in ice for hours instead of clearing during defrost.
• The system heats but won't cool, or the reverse.
• The emergency or auxiliary heat light is on most of the time in mild weather.
• Winter electric bills climbing year over year.
• Grinding, rattling or very loud startup noise from the outdoor unit.
• Repeated refrigerant top-offs.
• An age near or past 15 years.

What helps it last

• Clean or replace filters about every 3 months, or as your installer recommends, per DOE's heat pump guidance.
• Keep plants, snow, leaves and debris away from the outdoor unit, and make sure it sits high enough to stay clear of drifting snow.
• Keep supply and return registers clean and unblocked, and make sure closed rooms have a path for return air.
• Avoid deep thermostat setbacks that trigger backup electric heat when you turn the heat back up.
• Have a technician service the system once a year to check airflow, refrigerant charge and leaks, as DOE recommends.
• Watch defrost cycles. Steam rising off the outdoor unit in winter is normal. A solid block of ice is a service call.

Repair or replace?

Because heat pumps run all year, a repair buys fewer extra years than the same repair on an air conditioner. Keep that in mind when you run the numbers. Divide the repair cost by the years the system can realistically give you, then divide the replacement cost above by about 15 years of service from a new unit. If the old system's cost per remaining year is higher, replacement is the better buy. Controls, sensors, capacitors and fan motors usually pass this test. A compressor or reversing valve failure on a system past 10 years usually doesn't. The 50 percent rule (replace when the repair exceeds about half the cost of a new system) is a fair shortcut, especially for systems running R-22. Newer cold-climate heat pumps also heat far better in low temperatures, so efficiency gains count in favor of replacing an older unit.

Common symptoms

• Why is my heat pump blowing cold air