How Long Do AC Units Last? Here’s What Homeowners in Texas Should Know

When the summer heat rolls into Mesquite, a working AC isn’t a luxury—it’s a must. If your system is struggling, you might be wondering, how long do AC units last, and is it time to replace yours?

At FERSA HVAC Heating & Air, we help homeowners throughout the Dallas area figure out when it’s time for a tune-up—or when a new system makes more sense.

What’s the Average Lifespan of an AC Unit?

Most central air conditioning units last between 12 to 17 years. With regular maintenance, some systems can run well past the 15-year mark. However, climate, usage, and how well the system was installed all impact longevity.

Signs your AC might be reaching the end include frequent repairs, uneven or inconsistent cooling, unexplained increases in your energy bills, or if your unit still uses outdated R-22 refrigerant. If it’s also struggling to keep up with the intense Texas heat, it’s probably time to consider a replacement.

If you notice any of these issues, it may be time to weigh repair costs against replacement value.

Repair vs. Replace — What’s the Right Move?

Not every issue means you need a new unit. But repair costs can quickly add up after about 10–12 years. Here’s a quick guide:

Repair If:

• Your unit is under 10 years old
• The issue is minor (like a capacitor or contactor)
• This is your first major repair

Replace If:

• The unit is over 12 years old
• Repairs cost more than 30% of a new system
• You want better efficiency or comfort
• You’re planning to stay in the home long-term

Learn more in our AC replacement vs. repair guide.

How to Make Your AC Last Longer

The best way to stretch your AC’s life is through routine maintenance. You should change your air filters every 1–3 months, schedule a professional tune-up before summer, and keep the outdoor unit clean and debris-free. Using a programmable thermostat helps reduce strain on the system, and it’s important not to ignore strange noises or weak airflow—these are early warning signs that something’s off.

Our team offers professional maintenance services in Mesquite, Garland, and Plano to help you get the most out of your system.

FAQs – AC Lifespan and Replacement

Can an AC last more than 20 years?

It’s rare, but possible. That said, older systems are less efficient and may cost more to run—even if they’re still working.

Does location affect AC lifespan?

Yes. Texas heat means your AC works harder, which can shorten its lifespan without regular care.

Should I replace my AC before it fails altogether?

Yes. Replacing it early can prevent mid-summer breakdowns, save money on emergency repairs, and give you time to choose the right system.

Ready to Upgrade? FERSA HVAC Have You Covered

Still asking yourself, how long do AC units last? If your system is older than 10 years, it’s smart to talk to a pro. At FERSA HVAC Heating & Air, we’ll inspect your unit, give you honest advice, and help you decide if repair or replacement is the better choice.