How Long Do AC Units Last?
A central air conditioner usually lasts 12 to 17 years, and a heat pump 10 to 15, because it also runs all winter. Coastal air, poor installation and skipped maintenance can take years off either one.
By Suraj Jha · Updated 2026-10-21
AC and heat pump life expectancy
| Equipment | Typical life |
|---|---|
| Air conditioner | 12–17 years |
| Heat pump | 10–15 years |
| Furnace | 15–20 years |
ENERGY STAR suggests considering replacement of central air conditioners and heat pumps more than about 10 to 15 years old, particularly if they’re struggling or need a big repair. That doesn’t mean a working 15-year-old system has to go, but it’s the age when replacement planning makes sense.
What shortens an air conditioner’s life
Bad installation. Studies of residential HVAC have repeatedly found that a large share of systems are installed with the wrong refrigerant charge or poor airflow. Both make the compressor run hotter and longer. An oversized system short-cycles: it cools the air quickly but doesn’t run long enough to dehumidify, and the frequent starts wear the compressor.
Dirty coils and filters. A blocked outdoor coil can’t shed heat, and a dirty indoor filter starves the indoor coil of airflow. Both raise pressures and temperatures inside the system.
Coastal and corrosive environments. Salt air near the ocean corrodes outdoor coils and fins much faster. Coastal homes often see AC lives at the bottom of the range unless the units have coated coils and are rinsed regularly.
Climate and runtime. A system in Phoenix or Houston runs far more hours every year than one in Seattle.
Electrical problems. Weak capacitors, pitted contactors and voltage problems make the compressor start harder. These parts are cheap, but if they’re ignored they can kill an expensive compressor.
Signs your AC is near the end
- It runs constantly on hot days but can’t hold the thermostat setting
- Higher electric bills than in previous summers
- Ice on the refrigerant lines or the indoor coil
- Repeated refrigerant top-ups (there’s a leak somewhere)
- Loud humming, clanking or grinding from the outdoor unit, or a compressor that trips the breaker
- Poor humidity control: the house feels clammy even when it’s cool
The refrigerant question: R-22 and the 2025 transition
R-22 (Freon) was the standard refrigerant in US home air conditioners for decades. New systems charged with R-22 stopped being made around 2010, and as of January 1, 2020 R-22 is no longer produced or imported in the US. Only recovered and recycled supplies remain, so repairing a leak on an R-22 system is expensive. If your AC was built before about 2010, check the rating plate: if it says R-22 or HCFC-22, a major leak or compressor failure is a strong reason to replace.
R-410A replaced R-22 and has been the standard since. Under the EPA’s refrigerant rules, new residential systems from 2025 onward use lower-impact refrigerants such as R-454B and R-32. Existing R-410A systems can keep running and be serviced; the change mainly matters when you buy new equipment, because the indoor coil and outdoor unit must be designed for the same refrigerant.
Repair or replace?
- Capacitor, contactor, fan motor, thermostat, drain line: repair, at almost any age.
- Refrigerant leak on a newer R-410A system: repair, if the leak can be found and fixed.
- Compressor, outdoor coil or indoor coil on a system over about 10 years old: compare the repair with a new system. If it’s more than about half the cost of replacing, replace.
- Any major repair on an R-22 system: usually replace.
If the system is also a heat pump, remember that a replacement improves both your cooling and your heating efficiency, which shortens the payback period.
Helping your AC last longer
- Change the indoor filter regularly (every one to three months, depending on the type).
- Keep the outdoor unit clear of plants, leaves and grass clippings; leave at least 2 feet of clearance around it.
- Rinse the outdoor coil gently with a garden hose each spring (power off first).
- Book a professional check every spring to measure the refrigerant charge and airflow and to test the electrical parts.
- Keep the condensate drain clear to avoid water damage and shutdowns.
Check your AC’s age
The serial number on the outdoor unit’s rating plate encodes the build date. Our HVAC age lookup decodes it for the major brands, including Carrier, Goodman, Lennox, Trane, Rheem and York.
Frequently asked questions
What is the average lifespan of a central AC unit?
About 12 to 17 years. Units in mild, dry climates with regular maintenance can last longer; units in hot, humid or coastal areas often don't.
Why do heat pumps wear out faster than air conditioners?
A heat pump is an air conditioner that also runs in reverse for heating, so it builds up roughly twice the operating hours each year in many climates.
Should I replace a 15-year-old AC that still works?
If it's cooling well and repairs have been minor, you can keep it running, but plan and budget for its replacement. If it needs a compressor or a coil, or runs on R-22, replacing is usually the better deal.
My AC uses R-22. Do I have to replace it?
No, you can keep using it. But R-22 hasn't been produced or imported in the US since 2020, so recharging a leaking system is expensive and gets harder each year.
Can I replace just the outdoor unit?
Sometimes, but manufacturers generally require a matched indoor coil for the rated efficiency and full warranty, and a new refrigerant type often means the indoor coil must be replaced too.
Next steps
Look up the age of your furnace and air conditioner
More about air conditioners and heat pumps
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