Should you repair or replace your central air conditioner?
Updated August 2026
← Every repair-or-replace call
Replace a central AC once it is past 12–15 years or the repair quote climbs above half the price of a new system; repair a younger unit with a bad capacitor, contactor, or condenser-fan motor. Those small electrical parts run $150–650 and buy years of cooling, so there is no case for a $5,000-plus teardown when one of them is the only fault. The call gets harder once the compressor is involved, because that single repair runs $1,500–2,800 against a new system at $5,000–10,000. Age, refrigerant type, and that ratio settle it, and the table below walks through each situation.
The short version
Read the age and the repair cost together, never one without the other. In the first eight years, repair almost any fault: capacitors, contactors, and fan motors are routine and cheap next to the decade of service still ahead. From about year 12, run the 50% rule, where a repair that costs more than half a new system is money poured into equipment near the end of its life. One factor overrides the arithmetic, and that is refrigerant. A unit built for R-22 is worth replacing the moment it needs a major repair, because that phased-out refrigerant now costs $100 or more per pound and a leak can mean hundreds of dollars just to recharge.
Your situation, decided
| Situation | Verdict | Why |
|---|---|---|
| Under 8 years, bad capacitor, contactor, or fan motor | Repair | A $150–650 electrical part on a system with years of life left |
| Compressor failed, unit under 8 years and in warranty | Repair | The part is covered; you pay labor, not the full $1,500–2,800 |
| Compressor failed, unit past 12 years | Replace | A $1,500–2,800 repair on aging equipment fails the 50% rule |
| R-22 system needs any major repair | Replace | Refrigerant at $100+ per pound makes the old unit a money pit |
| Past 12–15 years, cooling weakly, repair over half a new unit | Replace | End of service life; a matched new system is the better spend |
| Refrigerant low but no leak found, unit under 10 years | Repair | A recharge plus leak search, not a reason to replace |
What each path costs
Repairs typically run $150–650; a replacement is $5,000–10,000 installed. Central AC lasts 12–15 years. The repair-or-replace line falls around year 12, and an R-22 system tips toward replacement sooner because that refrigerant now runs $100+ per pound. Price your own number on the home maintenance cost calculator before you commit either way.
The repair-or-replace call is easy when you know the unit's age and service history. OnOtto keeps both, plus the maintenance that delays this decision for years.
Start your home's service log, freeFrequently asked questions
Is it worth replacing just the compressor on my AC?
Only if the system is young. Under eight years and still inside the standard 10-year parts warranty, swapping the compressor for $1,500–2,800 in labor makes sense, since the rest of the system has plenty of life. Past 12 years the compressor and the outdoor coil are a matched, aging pair, and spending that much on one of them leaves you with an old, inefficient unit. At that age the money is better applied to a full changeout at $5,000–10,000. Our lifespan guide shows where your unit sits.
Does an R-22 refrigerant leak mean I have to replace the AC?
Not automatically, but it pushes hard in that direction. R-22 was phased out of production, so what remains is reclaimed and now costs $100 or more per pound; a typical recharge needs several pounds. If your unit is under 10 years, a small leak repair plus a recharge can still pay off. If it is older, leaking, and needs any other part, put the refrigerant money toward a modern system that runs cheaper R-410A or R-454B. Chasing R-22 into an old AC rarely comes out ahead.
How much does regular maintenance push back the replace decision?
A yearly tune-up and clean coils keep a system in repair territory longer. Dirty coils and weak airflow make the compressor run hot, and the compressor is the one part whose failure usually ends the system. A spring test and annual service catch a tired capacitor or low charge before they cascade. The U.S. Department of Energy puts the efficiency penalty from a clogged filter at 5–15%, so the habit protects both your power bill and the compressor.
Should I replace my furnace at the same time as the AC?
Often yes, if both are old. The indoor coil sits on top of the furnace and shares the air handler, so a matched system installed together runs more efficiently and costs less in combined labor than two separate visits. If your furnace is also past 15 years, replacing both at once is common practice. If the furnace is newer, a standalone AC replacement is fine, but confirm the new coil matches the existing blower. Ask the installer to size the pair as one system.