Commercial HVAC Tonnage Calculator
Get a ballpark tonnage for a commercial space. Commercial loads vary widely by occupancy, equipment and ventilation, so treat this as a starting point for a professional survey.
Commercial HVAC Tonnage Calculator
Ballpark the cooling tonnage a commercial space needs by area and occupancy type.
Your estimated tonnage will appear here.
Estimated cooling
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Rule used
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sq ft per ton
Commercial loads vary widely with equipment, ventilation codes and occupancy — a professional load calculation is essential. This tool provides a rough estimate for general informational purposes only and is not professional advice, a guarantee, or a quote. Results may not reflect your specific situation. Always confirm with a licensed HVAC professional before making any purchase or decision. See our Terms of Service for details.
Frequently Asked Questions
How many square feet per ton for commercial HVAC?
A common rule of thumb is 250–400 sq ft per ton depending on occupancy — offices are lighter, restaurants and retail are heavier. A load calculation is essential for commercial work.
Why is commercial sizing different from residential?
Commercial spaces have higher occupancy, more equipment heat, ventilation codes and zoning needs, so cooling loads per square foot are usually higher than a home.