Key takeaways
- Systems commonly last about 12 to 15 years for air conditioners, 15 to 20 for furnaces and 10 to 15 for heat pumps.
- A common rule is that if the repair costs more than about half of a new system, replacement deserves a hard look.
- Frequent repairs, rising bills and uneven comfort point toward replacement.
- A repair on a newer system under warranty is usually the right call.
Start with age and history
Age is the first clue. A ten-year-old system with a single failed capacitor is a repair. A sixteen-year-old air conditioner with a leaking coil and a record of repairs is a candidate for replacement. Ask how many repairs the system has needed in the last two years.
Also consider how long you plan to stay. If you will move soon, a repair may be enough. If this is your long-term home, new equipment can improve comfort and lower bills.
Do the math
Two quick rules help. The first is the half rule: if a repair costs half or more of a new system, replace. The second is multiplying age by the repair cost: if the number is above about 5,000, many contractors suggest replacement. Neither is exact, but they point in the right direction.
Efficiency matters too. A new system can use much less electricity than one from fifteen years ago, so ongoing savings should be part of the comparison.
Think about comfort and safety
Uneven rooms, noise, humidity problems and frequent breakdowns are comfort costs that never show up on a repair bill. If a furnace has a cracked heat exchanger or a gas safety problem, replacement is often the safest choice.
Our Repair or Replace tool walks through these factors and gives you a starting recommendation.
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Quick answers
How long should an air conditioner last?
About 12 to 15 years on average in Middle Tennessee with regular maintenance, and sometimes longer.
Is it worth repairing a 15-year-old AC?
For a small repair, maybe. For a major part such as a compressor or coil, replacement usually makes more sense.
Ready to talk it through? Get a free estimate or call 615-431-3789.