How Long Do AC Units Last?

When your air conditioner works well, it’s easy to forget it won’t last forever. But like any appliance, it has a lifespan. Whether you have a central AC system, a mini-split AC unit, or a window unit, knowing how long it’s expected to last can help you plan ahead.

If your cooling system is getting older or acting up, you might wonder if it’s time to repair or replace it. First, let’s look at how long they typically last.

How Long Do Air Conditioners Last?

The average AC unit lasts anywhere from 7 to 20 years. It depends on the type of unit you have and how well it’s maintained.

Central Air Conditioning

The AC component of an HVAC lasts around 15 to 20 years, depending on how well it’s maintained. These systems are often more durable than window or mini-split units but still need regular tune-ups to keep working efficiently.

Window AC Unit

Window units have a shorter lifespan. Most last between 5 and 10 years, depending on how often you use them and how well you take care of them. If your unit is over 7 years old and making strange noises or struggling to cool, it may be time for a replacement.

And if you're getting a new one, installing a window AC unit correctly can help it run better and last longer.

What Factors Affect Your AC Unit’s Lifespan?

Like the lifespan of other appliances, how long your AC lasts depends on how you use it and how well you maintain it. A few key things can make your air conditioner last longer or wear it out faster:

• Maintenance: Regular cleaning and tune-ups can add years to your AC's lifespan.
• Usage: Units that run constantly wear out faster than ones used less often.
• Installation quality: If your AC wasn’t installed properly, it may not last as long.
• Air filter changes: A clogged HVAC air filter can slow airflow, making your AC work harder than it should. Over time, that extra strain can lead to breakdowns and a shorter lifespan.
• Climate: Humid climates cause ACs to work harder, which can shorten their lifespan.
• Unit size/cooling capacity: An AC that’s too small (has too little cooling capacity) for your space will work harder to keep up, while a unit that is too large may cycle too often and wear out faster.

5 Signs You Need to Replace Your Air Conditioner

Not sure if it's time for an upgrade? Here are some clear signs it might be time to stop repairing issues and replace your air conditioner instead:

1. It’s An Older Model

Even if your AC still works, an outdated model may not run as efficiently as newer ones. Older units tend to use more energy, cool unevenly, and lack features like smart thermostat compatibility or quieter operation.

Upgrading to a modern system can make a big difference in comfort and energy costs, especially if your current unit is past its prime.

2. It Needs Frequent Repairs

If you’ve had to call a repair tech more than once or twice in a single season, your AC may be reaching the end of its life. Parts wear out over time, and repair costs can add up fast. In many cases, putting that money toward a new system makes more sense in the long run.

3. Your Energy Bills Are Rising

If your energy bill is creeping up, your AC might be to blame. Older or failing systems often run longer to try to keep up. That extra runtime costs you money. A newer, more energy-efficient model could cut your cooling costs and save you more each month.

4. It Struggles to Keep Up

Is your home still hot even with the AC running nonstop? That’s a red flag. Your unit might not be powerful enough, or it could be wearing out. Uneven cooling, hot spots, or humidity problems are also signs that something’s wrong.

5. It’s Making Strange Sounds or Smells

Clanging, banging, grinding, or buzzing noises often mean mechanical parts are failing. Musty smells could point to mold in the system, while burning smells can be even more serious and should be checked out right away. Any of these signs could mean it’s time for an AC replacement.

How to Extend Your AC Unit’s Lifespan

If you want to get more years out of your central AC, try these simple tips to keep your system running longer:

• Schedule yearly professional AC or HVAC maintenance.
• Clean or replace the air filter every 1 to 3 months.
• Keep the outdoor unit clear of leaves and debris.
• Don’t block air vents inside your home.
• Use a programmable thermostat to avoid overworking the system.
• Seal windows and doors to keep cool air in.

Take Care of Your AC with a Home Warranty

A home warranty can help take care of repair or replacement costs when your AC breaks down due to normal wear and tear. That means fewer surprises and more peace of mind. Get a free home warranty quote today.

The contents of this article are provided for general guidance only. First American Home Warranty does not assume any responsibility for losses or damages as a result of using this information.

Please be aware that if you disassemble a covered system or item, it can invalidate your home warranty or manufacturer's warranty.