Use the estimator
Manual J and on-site load calculations from a licensed pro supersede any online estimate. Sun exposure, duct leakage, and insulation vary by home.
Rough room-by-room cooling capacity estimate from dimensions, occupancy, and simple load factors—useful before you talk to contractors.

Manual J and on-site load calculations from a licensed pro supersede any online estimate. Sun exposure, duct leakage, and insulation vary by home.