Central AC System GuideCentral AC tool
AC Repair or Replace Estimator
Weigh AC age, repair cost, and new system cost to see whether repair or replacement is the more sensible direction.
Considered suggestion
Fine Print and Sources
Screening estimate only. These tools use only the values you enter and simple planning math. A professional Manual J load calculation is authoritative for equipment sizing, room loads, and final purchase decisions. Confirm with a licensed HVAC pro before you buy.
This is a considered suggestion, not a mandate. Central AC units past about 12 to 15 years, or with a repair cost that is a large share of replacement, often lean toward replacement. The R-410A refrigerant phase-down may raise the cost or reduce the availability of repair parts for older systems, which can tip an older unit toward replacement.
- EnergySage central air conditioner sizing guide: explains square-feet-per-ton screening ranges, notes one ton equals 12,000 BTU/h, and warns that oversizing causes short cycling and poor humidity control.
- ENERGY STAR central air conditioning: describes right-sizing and efficiency selection for central AC equipment.
- EPA HFC reduction program: describes the phase-down of high-GWP refrigerants such as R-410A that can affect repair parts for older systems.