HVAC · Preliminary room load
Describe the room. See the load.
Build a transparent BTU planning estimate from geometry, envelope assumptions, windows, and regular occupants.
LengthWidthCeiling heightWindows
Measure conditioned floor dimensions and finished ceiling height. Count only windows in this room group.
1 Measure the room group
2 Describe the envelope
3 Add internal load
Results update automatically · baseline 20 BTU/h per ft²
Method and limitations
A visible baseline with visible adjustments.
The estimator starts with 20 BTU/h per square foot, adjusts for ceiling height, climate, insulation, and sun, then adds allowances for occupants above two and windows. It is a comparison aid, not a load calculation or equipment recommendation.