AC Repair vs Replace Calculator

The calculator asks five things, because those five change the math more than a brand name or a sales script. System age is the first: a well-maintained central AC typically lives in a 15-to-20-year window, so an 18-year-old machine and a 4-year-old machine should not get the same advice. Repair estimate, if you have one, is the second — a small electrical repair is a different conversation than a sealed-circuit failure. If you do not have an estimate yet, say so; the tool will not invent one.

Refrigerant type is the third, and it is not trivia. R-22 is no longer produced, so refrigerant work on those systems is expensive dead-end money. Existing R-410A systems can still be serviced, and new residential split systems are held to EPA's GWP limit of 700 (a May 2026 EPA rule still allows installing R-410A equipment manufactured or imported before January 1, 2025). That distinction belongs on the R-410A transition guide, and this tool only uses it as a scoring input. Breakdowns in the last two years is the fourth: two or more failures is a reliability pattern, not bad luck. Comfort problems even when it runs is the fifth — a system that still starts but never catches up upstairs is already telling you the equipment, the ducts, or both no longer fit the house.

The output is a lean, not a quote. Three verdicts: repair is probably the right call, worth comparing a repair quote against replacement math, or replacement likely makes more financial sense. Under the headline you will see the reasons that actually fired — age, the $5,000 test, refrigerant, repeat breakdowns, comfort — so you can disagree with a specific input instead of arguing with a black box.

The $5,000 test is one scoring rule, not a price. It multiplies a midpoint for the system's age by a midpoint for the repair estimate. If that product clears $5,000, replacement deserves a serious look alongside the other factors. It does not mean the job costs $5,000, and it does not run if you have not entered a repair estimate.

A good diagnostic can still change the answer. A scary symptom is sometimes a small part. An optimistic repair on an old R-22 system is sometimes a delay. That is why the longer write-up is the repair-or-replace guide, and why the next step is still an on-site visit for AC repair or a written replacement scope on AC installation. If a heat pump is in the mix, heat pump installation is the comparison, not a default.

This page does not invent a replacement price. It does not know your ducts, your electrical panel, your attic, or which city or county issues the permit. It does not promise a rebate. It does not replace a load calculation. If someone quotes a single number from five dropdowns, they are selling certainty they do not have.