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What Is the $5,000 Rule for AC Repair vs. Replacement?
Multiply your repair estimate by the age of your AC unit in years. If the result is over $5,000, replacement is typically the more cost-effective decision than continuing to repair an aging system. A $900 repair on a 4-year-old unit (3,600) says repair; the same $900 repair on a 12-year-old unit (10,800) says replace.
Why This Math Works
The rule is a proxy for a real question: how much more life is left in this system, and how many more repairs will it likely need? An older unit with one failure is statistically more likely to have another failure soon, so a repair's true cost includes the risk of paying again within a year or two — the multiplier accounts for that risk without requiring a full cost-benefit spreadsheet.
Repair vs. Replace, Side by Side
• Upfront cost — Repair: Lower — Replace: Higher
• Efficiency — Repair: Unchanged (existing SEER2 rating) — Replace: Improved — new systems start at 14.3 SEER2 minimum
• Warranty — Repair: Repair-only, often 90 days-1 year — Replace: Full manufacturer warranty on the new system
• Risk of repeat failure — Repair: Higher on units over 10 years old — Replace: Low — new components throughout
• Best for — Repair: Systems under 8-10 years with a single component failure — Replace: Systems over 10-12 years, repeated repairs, or R-22 refrigerant
When the Rule Doesn't Apply
A young system (under 5 years old) with a single failed part is almost always worth repairing regardless of the math, since most of its service life — and its manufacturer warranty coverage — is still ahead of it. On the other end, a handful of repairs override the formula entirely and point straight to replacement:
• A cracked heat exchanger or a serious refrigerant leak in the coil (not just the line set)
• A failed compressor on a unit already past 10 years old
• A system still running R-22 refrigerant, which is being phased out and increasingly expensive to source
What This Means for Your Specific System
The $5,000 rule is a starting point for the conversation, not a substitute for a real diagnostic — the actual repair cost, your system's true condition, and your plans for the home all factor into the right call. We'll show you exactly what's failed and give you honest pricing for both options before you decide.
Want the real numbers for your system? Get a firm quote on AC replacement, or start with a diagnostic if you're not sure yet which side of the math you're on.
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