How Long Does an AC Unit Last in Florida?

These estimates come from InterNACHI’s life expectancy chart for Florida homes. Maintenance makes a big difference, so treat them as a guide, not a deadline.

• It runs constantly but the building never gets cool, or some rooms never do
• Repairs are getting more frequent, especially compressor or refrigerant leak work
• Electric bills climbing without a change in how you use the space
• Rust, corrosion or flaking fins on the outdoor unit, common near the coast
• Humidity problems: a musty smell or damp air even when it’s running
• The system uses R-22 refrigerant. Production ended in the U.S. in 2020, so recharging an older system keeps getting harder and more expensive.

A common rule of thumb: multiply the system’s age by the repair cost. If the result is over about $5,000, replacement usually makes more sense. It’s a starting point, not a rule. A newer system with one bad part is worth fixing; an old system that needs a compressor usually isn’t.

• Ask the technician how old the system is and what else is likely to fail soon.
• Get the repair price and a replacement quote at the same visit, so you can compare.
• For a replacement, ask whether a load calculation was done, or whether they’re just matching the old size.

• Change filters on schedule, more often in buildings with pets or heavy use.
• Keep the outdoor unit clear of plants and debris, and rinse salt and dirt off coastal units.
• Have it serviced at least once a year, ideally before the summer.
• Keep the condensate drain line clear. Clogs cause leaks, water damage and shutdowns.
• For several units, a maintenance agreement with one contractor is usually cheaper than calling for each problem.