HVAC · Heating-capacity arithmetic
Compare furnace output and input ratings.
Use measured floor plates and your own heating baseline, climate, insulation, allowance, and efficiency assumptions.
← Conditioned footprint length →↕ Conditioned footprint widthConditioned floor plate × floor count
← Furnace input rating →↕ Delivered output capacityEfficiency separates input from output
1 Measure conditioned floor plates
2 Enter verified planning assumptions
Transparent calculation
Output = area × entered baseline × entered factors × allowance.
Input rating divides that output by the entered efficiency. This keeps delivered heat and fuel-input rating visibly separate.