How Long Do AC Units Last?
A central air conditioner typically lasts 12 to 17 years. Heat pumps run year-round and often last a little less. Climate, maintenance and correct sizing make the difference.
Lifespan by system
| Item | Guidance | Notes |
|---|---|---|
| Central AC | 12 to 17 years | $6,800 to $10,200 to replace |
| Heat pump | 12 to 15 years | $6,800 to $11,700 to replace |
| Ductless mini split | 15 to 20 years | $2,300 to $5,000 to replace |
| Gas furnace | 15 to 20 years | $4,600 to $7,900 to replace |
What shortens AC life
Running in hot climates for eight or more months a year, dirty filters and coils, refrigerant leaks left unfixed, oversized systems that short-cycle, and outdoor units buried in debris or exposed to salt air.
Repair or replace?
A common rule: if the unit is over 10 years old and the repair costs more than a third of a replacement, replace. Refrigerant type matters too; older R-410A systems can become expensive to service as newer refrigerants take over.
How to make it last
Change filters on schedule, keep the outdoor unit clear, have the system serviced yearly, and fix small problems before they stress the compressor.
Common questions
How long does a central air conditioner last?
Most last 12 to 17 years with regular maintenance.
Is it worth repairing a 15-year-old AC?
Usually only for minor repairs. Major repairs on a unit that old rarely make sense.
Should I replace the furnace at the same time?
If both are near the end of their lives, replacing together lowers labor cost and keeps the equipment matched.