How long does an air-source heat pump last?
Typical
15 years
Range
15–20 years
Air-source heat pumps typically last 15–20 years — longer than gas boilers, with fewer moving parts at high temperature. Annual checks keep refrigerant pressure and airflow right; compressors are the component that eventually retires the unit.
What decides it
- Annual maintenance check (filters, refrigerant, defrost cycle)
- Coastal salt air corrodes external units faster
- Good installation: airflow clearance and correctly sized emitters
- Runtime — a pump sized too small runs harder and ages faster
When to replace rather than repair
A failed compressor outside warranty is usually the replacement moment; most other parts are economically repairable for the first 15 years.
Typical ranges from manufacturer guidance and industry surveys — individual machines vary with use and care. General information, not advice on a specific appliance.