Heat loss calculation worksheet 2026

1. Click ‘Get Form’ to open the heat loss calculation worksheet in the editor.
2. Begin by entering the homeowner's name, phone number, and address in the designated fields at the top of the form.
3. Record the inside and outside design temperatures for both winter and summer conditions. Calculate the heating and cooling temperature differences as indicated.
4. Measure and input the total area of windows and doors into Tables A and B. Ensure that totals match at the bottom of each table.
5. Calculate gross wall area by multiplying the total length of exposed walls by ceiling height. Subtract window and door areas to find net wall area.
6. Continue filling out exposed ceiling and floor areas, applying appropriate multipliers from Table C for accurate BTUH loss/gain calculations.
7. Total BTUH loss and gain columns, then calculate sensible totals based on your selected design temperature differences.

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