HVAC · Cooling-load arithmetic

Build an air-conditioner BTU estimate.

See how your entered area baseline, ceiling height, solar multiplier, people, windows, and kitchen allowance combine.

← Conditioned room length →↕ Finished ceiling height↕ Conditioned room widthConditioned rectangular volume

← Window group width →↕ Window group heightCount exposed windows

1 Measure the conditioned room

Conditioned room lengthfeetConditioned room widthfeetFinished ceiling heightfeet

2 Enter your planning assumptions

Entered cooling baselineBTU/h per ft²Regular occupantspeopleExposed window countwindowsEntered solar multiplierfactorEntered kitchen allowanceBTU/h

Transparent calculation

Entered baseline × area × height factor × solar factor, plus entered allowances.

The height factor is ceiling height divided by eight feet. Each window adds 1,000 BTU/h and each occupant above two adds 600 BTU/h as visible planning assumptions—not design prescriptions.