Calculator 01 / Room capacity
How much cooling does the room need?
Use this for a conventional room AC starting estimate. For portable models, compare the result with the unit's DOE SACC rating.
Starting estimate
Btu/hBased on 350 square feet with typical sun and two occupants.
Shopping for portable AC?Compare this estimate with DOE SACC, not only the larger ASHRAE number.
What this estimate does not see
ENERGY STAR's room table assumes an 8-foot ceiling. Insulation, air leakage, window area, roof exposure, local climate, connected rooms, and major equipment loads may require a more detailed calculation. Permanent mini-splits and whole-home systems should be sized with a recognized load calculation.
Read the complete sizing guide →