Should I Repair or Replace My AC Unit?
What this costs
| Option | Job | Low | High |
|---|---|---|---|
| Replace | AC Replacement | $3,800 | $9,050 |
ENERGY STAR's checklist
The EPA's ENERGY STAR program says that if two or more items in the Replace column apply to you, it's probably time to consider replacing the system.
- Repair if: under 10 years old. Replace if: over 10 years old.
- Repair if: good service record. Replace if: repeat problems.
- Repair if: major repairs were made recently and only a minor one is needed. Replace if: extensive or costly repairs are needed.
- Repair if: on/off cycling isn't excessive. Replace if: it seems excessive.
- Repair if: it performs up to expectations. Replace if: it doesn't.
- Repair if: you're moving soon. Replace if: you're staying long term.
What else to weigh
Mississippi State University Extension says replacing a unit that is only 10 years old with a more efficient one may save 20 to 40 percent on cooling energy costs. If you replace, it advises replacing both the indoor and outdoor units when they differ in age, refrigerant or efficiency. Lifespan sources vary, from 10 to 15 years (NAHB's 2007 study) to about 20 (Mississippi State).
Run the numbers
Our replacement estimate is on this page. Get a repair quote and compare the two.
AC Not Cooling? What to Check Before You Call
Common questions
Is it worth fixing a 15-year-old AC?
Can I replace only the outside unit?
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Last verified 2026-11-03
- ENERGY STAR / EPA: Repair or Replace? You Decide (undated checklist for contractors) — Repair-or-replace checklist: 10 years is the dividing age; two or more items in the replace column means consider replacement.
- ENERGY STAR: When Is It Time to Replace? — Warning signs and age thresholds for replacement.
- NAHB / Bank of America Home Equity: Study of Life Expectancy of Home Components (2007) — Air conditioners last 10-15 years.
- Mississippi State University Extension: Energy Efficient Homes, Air Conditioning — Central AC lasts about 20 years; replacing a 10-year-old unit may save 20 to 40 percent on cooling energy; replace both indoor and outdoor units if they differ in age, refrigerant or efficiency.
- ENERGY STAR: Maintenance Checklist — Airflow problems can reduce efficiency up to 15 percent.
General information, not professional advice. Conditions, codes and prices vary. Turn off power, gas or water before any work, and hire a licensed professional when in doubt. Cost figures are our estimates, not quotes.