How long does a central AC unit last?

Published July 21, 2026.

A central air conditioner typically lasts about 15 to 20 years, and some well-maintained units reach 25. Carrier puts most systems in that 15 to 20 year window with proper care, while a neglected unit can fail closer to 10 to 12 years. Your actual number depends on how hard the system runs, your climate, whether it was sized and installed correctly, and whether it gets basic annual service. If yours is past 15 and showing weak cooling, rising bills, or repeated repairs, it is time to plan ahead rather than wait for it to quit on the hottest day of the year.

How long each system type lasts

Central air is the common setup, but ductless systems age on a similar curve. The table below shows the typical ranges from Carrier.

System type	Typical lifespan	Notes
Central air conditioner	About 15 to 20 years	Well-maintained units can reach 25; neglected ones fail near 10 to 12
Ductless mini split	About 10 to 15 years	Premium inverter-driven units can last 20 years or more

Heat pumps use the same core technology as a central AC, so they age similarly, but they tend to run year round for both heating and cooling. That extra run time often pushes their real-world lifespan toward the lower end. Mini splits, according to Carrier, commonly run 10 to 15 years, with high-end inverter models reaching 20 or more thanks to variable-speed compressors that avoid hard on-off cycling.

What shortens or extends the life

Two identical units in two different homes can be years apart at the end. These are the factors that decide where yours lands.

Annual maintenance. Carrier calls yearly professional service the number one way to make an AC last. A dirty system works harder, which strains every component and leads to early failure.
Filter changes. A clogged filter restricts airflow and forces the system to work harder and use more electricity. Carrier recommends replacing a 1-inch pleated filter every 30 to 90 days, and a 4-inch media filter every 6 to 12 months.
Correct sizing and installation. A unit that is oversized or poorly installed short-cycles or runs under strain. Proper sizing by a certified technician is part of why some systems last much longer than others.
Climate and run time. Units in hot, humid southern climates rack up far more running hours than those in mild northern ones. Lower thermostat settings over many years add to the strain.
Coastal salt air. Saltwater spray near the coast corrodes the outdoor unit faster. Regular coil cleaning and debris removal help protect it.
Neglect. Skip the upkeep and Carrier notes the lifespan can drop to roughly 10 to 12 years.

You can estimate where yours stands with our AC lifespan calculator.

Signs your AC is failing

A central AC usually gives you warning before it stops. Carrier lists these as the main signals.

Frequent breakdowns. Needing a repair every cooling season is a strong sign the system is wearing out.
Rising energy bills. A failing unit burns more electricity to deliver the same cooling.
Weak or uneven cooling. Rooms that will not reach the set temperature, or big swings between rooms, point to a system losing capacity.
Loud noises. Grinding, banging, or rattling from the unit suggests worn or failing internal parts.
Age past 15 years. On its own, age is a leading predictor. Most systems are near the end by 15 to 20 years.
R-22 refrigerant. If your unit was made in 2009 or earlier it likely uses R-22, and that matters for cost, as covered below.

The R-22 refrigerant issue on older units

If your AC is more than about 15 years old, it may run on R-22 refrigerant, and that changes the repair math. The EPA stopped the production and import of R-22 as of January 1, 2020, because it depletes the ozone layer. Trane notes that new residential AC units and heat pumps using R-22 have not been sold in the US since 2010.

Keeping an existing R-22 system is allowed, and the EPA does not require you to replace it. Servicing it relies on recycled and reclaimed supply, which Trane reports can run roughly 60 to 250 dollars per pound and is getting scarcer. If an R-22 unit springs a refrigerant leak, the repair can cost enough to make replacement the smarter move.

Repair or replace

When something breaks, the age of the unit usually decides the call. Carrier’s rule of thumb is that if a repair would cost around 50 percent or more of a new system, replacement is typically the better value. A single fix on a unit still in its first several years is usually worth doing. Repeated repairs on a unit past 15 years, or any major repair on an R-22 system, generally point toward replacing it.

Efficiency changes the picture even when the unit still runs. Energy Star suggests considering replacement once an AC or heat pump is more than 10 years old, and says a correctly installed high-efficiency unit can save up to 20 percent on heating and cooling costs. A very old, low-SEER unit can cost you money every month, so a newer high-SEER system can pay back part of its price in lower bills over time.

Central AC involves electricity, refrigerant under pressure, and correct sizing for your home. Confirm any repair-or-replace decision, and any install, with a licensed HVAC professional and your local codes before you act.

Sources

Carrier · How Long Do Air Conditioners Last? carrier.com/us/en/residential/hvac-resources/air-conditioners/how-long-do-air-conditioners-last
Carrier · How Long Do Mini Splits Last? carrier.com/us/en/residential/hvac-resources/ductless-mini-splits/how-long-do-mini-splits-last
Carrier · How Often to Change Your Air Filter. carrier.com/us/en/residential/hvac-resources/air-conditioners/how-often-to-change-air-filter
Energy Star · When Is It Time to Replace? energystar.gov/saveathome/heating-cooling/replace
US EPA · Homeowners and Consumers: Frequently Asked Questions (R-22 phaseout). epa.gov/ods-phaseout/homeowners-and-consumers-frequently-asked-questions
Trane · What Is R-22 and Why Is It Being Phased Out? trane.com/residential/en/resources/glossary/what-is-r22

AC lifespan calculator →

Frequently asked questions

How long do ductless mini splits and heat pumps last?

Carrier reports that ductless mini splits typically last about 10 to 15 years with proper maintenance, and that premium inverter-driven units can reach 20 years or more. Heat pumps tend to land toward the lower end of that range in many homes because they run in both summer and winter, so they log more hours per year than a cooling-only AC. As with central air, regular filter cleaning and annual professional service make the difference between the low and high end. Your climate and how hard you run the system matter a lot here.

Is it worth replacing an AC that still works?

Sometimes, yes. Energy Star suggests considering replacement once a heat pump or air conditioner is more than 10 years old, and says a correctly installed high-efficiency unit can save up to 20 percent on heating and cooling costs. An old, low-efficiency unit can quietly cost you money every month even while it still cools. If yours also uses R-22 refrigerant, repairs get more expensive over time, which tilts the math further toward replacement. Get a licensed HVAC pro to compare your unit's efficiency against a modern one before you decide.

What are the first signs a central AC is failing?

Carrier points to frequent breakdowns, rising energy bills, uneven or weak cooling, and loud noises as the main warning signs. Age is the other big one, since most systems are near the end of their life by 15 to 20 years. A unit that needs repairs every season, or one that uses phased-out R-22 refrigerant, is usually signaling that its time is short. Any single sign is worth a look, and several together point to planning a replacement.