The stakes are real in both directions. Replacing a repairable system wastes thousands of dollars; repairing a dying one buys a few months and then you pay twice.
The $5,000 guideline
Multiply the system's age in years by the repair estimate. If the product exceeds roughly $5,000, replacement deserves serious consideration. A 12-year-old system with a $600 repair scores 7,200 — worth pausing over. A 6-year-old system with the same repair scores 3,600 — repair it.
Treat this as a filter, not a verdict. It ignores warranty coverage, duct condition and how well the system has otherwise performed.
Factors that push toward replacement
- Age over 12 years, which in this climate is closer to end-of-life than the national average
- R-22 refrigerant, where any refrigerant-related repair is expensive and getting worse
- Compressor or evaporator coil failure outside warranty
- Two or more repairs in the last two cooling seasons
- Rising electric bills with unchanged habits
- Chronic humidity problems that point to an oversized or mismatched system
- You plan to stay in the home long enough to recover the efficiency savings
Factors that push toward repair
- System under 10 years old with no repair history
- The failed part is under manufacturer warranty
- The repair is electrical — capacitor, contactor, relay, board — rather than sealed-system
- You are selling the home within a year or two
- The ductwork and installation quality are good, so the equipment is performing as designed
Run the numbers on cost per year
- 1Take the repair quote and estimate how many more seasons the system will realistically deliver.
- 2Divide the repair cost by those years to get a cost per year of service.
- 3Take the replacement quote and divide it by 12 to 15 years of expected life in this climate.
- 4Add the annual energy difference — a higher-efficiency system may reduce energy use versus a worn one, but actual savings vary by home, system and usage.
- 5Compare the two annual figures. The comparison is usually much clearer than the sticker prices suggest.
Get both quotes before deciding
Any technician recommending replacement should be willing to give you the repair number too, and vice versa. If you are only shown one option, ask for the other. The calculator below applies the framework on this page to your specific age, cost and repair history.