Tiny house planning calculator

Heat-loss and HVAC planning

Estimate transmission and ventilation heat loss from a simplified building envelope model.

Floor area (m²)Wall area (m²)Roof area (m²)Window/door area (m²)Wall U-value (W/m²K)Roof U-value (W/m²K)Floor U-value (W/m²K)Window U-value (W/m²K)Indoor design temperature (°C)Outdoor design temperature (°C)Interior volume (m³)Air changes per hourInternal gains (W)Planning safety factor

Estimated design load

Transmission loss

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Ventilation loss

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Design heating load

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Design load

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Safety and limitations

This tool provides an early planning estimate only; it is not a permit, certification, safety approval or final engineering design.
Use measured inputs and the exact manufacturer datasheets for the equipment, materials, installation method and operating environment.
Check local building, marine, electrical, gas, water, fire and environmental requirements before construction or installation.
Have a qualified professional verify the final design, protection devices, structure, ventilation, drainage, emergency systems and commissioning tests.
This result does not model every site condition, structural detail, weather event, emergency condition or code requirement.

If an input is unknown or the result is close to a limit, stop and obtain the missing documentation or professional verification.