Estimate both cooling and heating loads. Choose a quick “sq ft” estimate (like popular online tools) or a more detailed “volume/ft³” pass. These are ballpark numbers—we confirm final sizing with a professional Manual J during your quote.
Heads up: These simplified calcs use common factors (Quick: sqft×climate; Detailed: volume×climate) with multipliers for exposure, insulation, windows & infiltration. Actual design uses room-by-room Manual J.
