Repair an air conditioner when it's under about 10 years old, the fix is minor, and it's otherwise running well. Replace it when it's 12+ years old, needs a major repair like a compressor or coil, uses discontinued R-22 refrigerant, or your cooling bills keep climbing. The deciding factors are age, repair cost, refrigerant type, and efficiency.
Quick answer
- Under ~10 years and a small fix: repair.
- 12+ years with a major failure (compressor/coil): replace.
- Uses R-22 refrigerant: replacement is usually smarter — R-22 is phased out and costly.
- Apply the '$5,000 rule': repair cost × unit age; over $5,000 leans toward replacement.
Signs a repair makes sense
If your AC is relatively young, has been maintained, and the problem is a worn capacitor, a contactor, a fan motor, or low refrigerant from a fixable leak, repair is the cost-effective choice. A single affordable repair on a system with years of life left is money well spent — especially when the unit still cools evenly and holds the thermostat setpoint.
Signs it's time to replace
Replacement moves to the front when the system is past 12 years, the compressor or evaporator coil fails, or it runs on R-22 refrigerant (phased out, so recharges are expensive and increasingly hard to source). Rising energy bills, frequent breakdowns, and uneven cooling all point the same direction. A new high-SEER2 system can noticeably cut summer electricity use.
The math: the $5,000 rule
Multiply the repair estimate by the age of the unit in years. If the product is over $5,000, replacement is generally the better value. For example, a $700 repair on a 9-year-old unit equals $6,300 — a signal to replace. This isn't an absolute, but combined with refrigerant type and efficiency it gives you a clear, honest decision framework.
Common mistakes to avoid
Repeatedly recharging refrigerant
Refrigerant doesn't get 'used up' — if it's low, there's a leak. Paying for recharge after recharge without fixing the leak wastes money and, with R-22 systems, gets expensive fast. Find and fix the leak or replace.
Replacing only the outdoor unit on an old system
Swapping just the condenser and leaving an aged, mismatched indoor coil hurts efficiency and reliability. Matched systems perform as rated; mismatches often don't.
How Comfort Central Inc. helps
- We give an honest repair-or-replace recommendation with the numbers behind it — no pressure to replace a system with life left.
- Our technicians diagnose the actual fault before quoting, so you're not paying for guesswork.
- When replacement is right, we size and match the new system properly for real efficiency.
Frequently asked questions
How do I know if my AC uses R-22?
Check the nameplate on the outdoor unit for the refrigerant type, or ask your technician. Systems made before 2010 often use R-22, which has been phased out — recharges are costly, so replacement is frequently the better value.
My AC still works but the bills are high. Repair or replace?
Climbing bills on an older, well-maintained system usually mean declining efficiency. If it's past 12 years, replacing with a high-SEER2 unit often saves enough on electricity to justify the upgrade.
How long should a central AC last?
Typically 12–15 years with regular maintenance. Past that point, weigh any major repair against the efficiency and reliability gains of a new system.
Written by: Merle Vaughn · Last updated: June 17, 2026