BTU Calculator
HVAC sizing estimate
Results
| Recommended capacity | — |
|---|---|
| AC tonnage | — |
| Room area | — |
| Notes | — |
How to use
- AC BTU — enter room size and ceiling height with units, then set occupancy, room type, insulation, sun exposure, and climate.
- Heating BTU — enter width, length, and ceiling height, then insulation and the indoor/outdoor temperature difference you need to overcome.
- Results are rough planning estimates only—not a Manual J load calculation.
Disclaimer. Informational only—not HVAC design, Manual J, or energy-audit advice. Actual loads depend on insulation, windows, ductwork, and local codes; consult a licensed HVAC professional.