Methods reviewed October 15, 2026. Calculated examples and editable planning assumptions; confirm the actual equipment, site and jurisdiction.
A preliminary load worksheet, with explicit assumptions
This tool estimates heat transfer through a simple tent-shaped box, then adds an infiltration approximation and sensible internal gains. The roof uses the floor’s horizontal area, side area is perimeter × wall height, and volume is floor area × height. An actual pitched roof and ground contact can change those quantities. The default U-value, two air changes per hour and per-person gain are example inputs; they are not certified properties of your tent.
Transmission BTU/h = U × approximate envelope sqft × temperature difference °F
Infiltration BTU/h = 1.08 × (volume × air changes / 60) × temperature difference
Heating = max(0, transmission + infiltration − internal gains)
Sensible cooling = transmission + infiltration + internal gains
The 1.08 coefficient is a standard-air sensible approximation. A sensible ton equivalent is the computed sensible BTU/h divided by 12,000; it is not complete AC capacity. Latent humidity, required fresh air, roof pitch, open doors, duct losses, sun exposure and equipment performance require a more complete design. Enter a project-specific solar/equipment gain if available rather than assuming zero represents actual conditions.
Bring the inputs to a qualified supplier
Confirm the tent construction, enclosure, weather conditions, occupants, ventilation requirements and electrical supply. This worksheet does not select a heater, AC unit, fuel, installation location or safe clearance and cannot guarantee indoor conditions. No combustion appliance is recommended for operation inside a tent. Never use a fuel-burning heater in a camping tent.
Frequently asked questions about tent sizing
Is the cooling tonnage a complete AC recommendation?
No. Dividing the sensible cooling estimate by 12,000 gives only a sensible-load equivalent. Humidity and latent loads, fresh-air requirements, duct losses, open doors, solar exposure and actual tent construction require a professional equipment design.
Can this tool recommend a heater inside a tent?
No. It calculates a simplified thermal load only and does not select fuel, combustion appliances, ventilation, installation or safe clearances. Use a qualified supplier and the applicable equipment instructions and local requirements. Never use a fuel-burning heater in a camping tent.