Repair or Replace? How to Decide on an Aging System
A simple framework — age, repair cost, efficiency, and refrigerant — to decide whether to fix or replace your system.
Reviewed by Joe Martel · 5 min read · Updated June 2026 When an aging system breaks, the question is whether to spend on a repair or invest in a replacement. A few simple rules cut through the uncertainty.
The quick framework
- Age: Most systems last 12–17 years. Past ~12, lean toward replacement.
- The “$5,000 rule”: multiply the repair cost by the unit's age. Over $5,000 suggests replacing.
- Frequency: a third repair in two years signals end of life.
- Efficiency: a new high-SEER2 system can cut summer bills meaningfully.
- Refrigerant: older R-410A systems facing a big repair tip the scale toward new R-454B equipment.
When repair is the right call
If your system is under ~10 years old, the repair is modest, and it's never given you trouble, fixing it is usually smart. The goal isn't to sell you a system — it's to spend your money where it does the most good. We give you the numbers both ways so you can choose. If you do replace, ask about financing and current rebates.
Facing a big repair bill? Get an honest second opinion.
Key terms in this article
Sources & further reading
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