Central AC System GuideCentral AC tool
AC Operating Cost Calculator
Estimate seasonal cooling electricity use and cost from your AC size, SEER2 rating, run time, season length, and electric rate.
Screening estimate only.A professional Manual J load calculation is authoritative for final central AC sizing and equipment selection. Confirm any decision with a licensed HVAC pro.
Screening result
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.
Real cooling cost varies with climate, humidity, thermostat settings, duct losses, and part-load behavior. SEER2 is treated here as BTU output per watt-hour across the season assumptions you enter, so the result is a planning estimate rather than a metered bill.
- 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.