Furnace Fuel-Use Sizing Worksheet
This worksheet is for homeowners, HVAC pros, and contractors who need a fuel-use furnace size estimate from existing heating data. It gives a simple table with columns for Home, Therms, Old AFUE %, HDD, Indoor °F, Design °F, New AFUE %, BTU/h per °F, Design heat loss, and Input needed. The sheet includes an example row like My home with sample values.
Free printable · PDF
- 1 page
- US Letter, landscape — choose “Fit to page” for A4
- PDF, 55 KB
Free for personal, family and classroom use.
Enter the home’s heating therms, old AFUE, heating degree days, indoor temperature, design temperature, and the new AFUE. The worksheet calculates BTU/h per degree Fahrenheit, design heat loss, and the furnace input needed. Use one line per home and compare results before choosing equipment.
Good for
- Estimate furnace input from past fuel use
- Compare sizing for different AFUE ratings
- Check design heat loss before replacement
Tip: Print landscape on Letter paper so the full table stays easy to read.
5 files · XLSX, PDF, DOCX
Get every sheet: Furnace Sizing Template Pack
This sheet plus 4 more in one download, with the editable Excel and Word files. Room-by-room heat load worksheet, fuel-use sizing worksheet, furnace quote comparison sheet, seasonal maintenance checklist and contractor questions.
$5.00 USD, one-time 5 files · about $1.00 each
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