The short answer
Repair an AC when the fault is a small electrical or drain part on a unit that is otherwise sound. Replace it when a major part such as the compressor or a coil fails on an older unit, when leaks keep returning, or when repairs keep stacking up.
ENERGY STAR suggests considering replacement once an air conditioner passes about 10 years. New equipment uses lower-GWP refrigerants, so replacing one half usually means replacing the indoor coil too.
Which AC repairs are usually worth it?
A failed capacitor or contactor, a dead outdoor fan motor, a clogged condensate drain, a failed thermostat or a tripped float switch are all common, testable, modest repairs. On almost any working system they are worth doing.
The expensive repairs are the compressor, the outdoor coil and the indoor evaporator coil. These are where age and refrigerant change the answer.
How does the refrigerant change the decision?
Under EPA’s Technology Transitions rule, new residential AC and heat pump systems must use refrigerants under 700 GWP, so new equipment uses R-454B or R-32 rather than R-410A. Existing R-410A systems can still be repaired and recharged.
But if a major part fails on an older R-410A system and you decide to replace the outdoor unit, the new unit needs a compatible indoor coil, so a one-half replacement becomes a whole-system job.
Refrigerant leaks deserve special care. A system that needs refrigerant is leaking. A top-up without finding the leak is not a repair, and repeated top-ups are a strong signal to replace. Only EPA Section 608 certified technicians may handle refrigerant.
Repair or replace: the signals
| Signal | Leans repair | Leans replace |
|---|---|---|
| Age | Under about 10 years | Around or past 10–15 years |
| Fault | Capacitor, contactor, fan motor, drain, thermostat | Compressor or coil on an older unit |
| Refrigerant | No leak, or a leak found and fixed | Recurring leaks or repeated top-ups |
| Warranty | Parts still covered | Out of warranty |
| Comfort | Cools and dehumidifies well | Hot rooms, humidity, short cycling |
| Furnace | Not relevant | Furnace also old: consider both, or a heat pump |
How do you put numbers on it?
Estimate the remaining years the repaired AC is likely to run, and divide the repair price by them. Compare that with a new system’s price spread over its life, less any electricity saving from the higher efficiency. Use your own repair quote and two replacement quotes in the repair or replace calculator.
What drives a replacement price is size, efficiency tier, the indoor coil, line-set reuse or replacement, electrical work and labor. We publish no prices here: we do not yet hold enough sourced, dated quotes to state one honestly. Use the cost hub and the HVAC cost calculator with your own quotes.
What you can safely check first
Swap batteries if it has them.
A clogged filter can freeze the coil and stop cooling.
Reset a tripped breaker once. If it trips again, leave it off and call.
Capacitors can hold a dangerous charge; refrigerant work needs certification.
What a good repair quote looks like
A repair quote you can judge names the failed part, the test that showed it failed and the reading, the part’s warranty status, and whether refrigerant was added and how much.
If refrigerant was added, it should say where the leak was found and how it was fixed. A quote that only says "system low, recharged" tells you the leak is still there.
Ask for the model and serial numbers too, so you can check the manufacturer warranty yourself. Two written diagnoses that agree are a strong basis for either decision.
Where each option wins
Repair wins when
The part is small and the system is sound.
The unit is under parts warranty.
You plan a larger change soon and need a bridge.
Replacement wins when
A compressor or coil fails on an older system.
Leaks keep returning.
The furnace is also old, so a heat pump or a full matched system makes sense.
Questions
How long should an AC last?
Is it worth replacing a compressor on a 12-year-old AC?
Can I keep using R-410A?
Should my AC need refrigerant every year?
Can I replace only the outdoor unit?
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HYRE HVAC Research Desk
Primary-source research, data analysis and fact checking
We are a research desk, not a sales floor. We read the federal microdata file, the statute or the manufacturer data sheet ourselves, and we publish the figure with the document it came from and the date we retrieved it.
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