House Heat Loss

More about: House Heat Loss

What it calculates

The “House Heat Loss” calculator computes House heat loss in kW from 11 parameters: house floor area (single storey) (m²), ceiling height (m), external wall perimeter (m), window and door area (m²), wall u-value (W/(m²·K)), window u-value (W/(m²·K)), roof / ceiling u-value (W/(m²·K)), floor u-value (W/(m²·K)), indoor temperature (°C), design outdoor temperature (°C), air change rate (1/h).

A calculation that accounts for local rules and regional norms.

Example calculation

With parameters House floor area (single storey) = 100 m², Ceiling height = 2.7 m, External wall perimeter = 40 m, Window and door area = 15 m², Wall U-value = 0.35 W/(m²·K), Window U-value = 1.8 W/(m²·K), Roof / ceiling U-value = 0.25 W/(m²·K), Floor U-value = 0.3 W/(m²·K), Indoor temperature = 20 °C, Design outdoor temperature = -26 °C, Air change rate = 0.5 1/h the result is 7.38 kW (Simplified calculation; floor loss uses the full temperature difference, so it is conservative).

How to use

1. Enter house floor area (single storey), ceiling height, external wall perimeter, window and door area, wall u-value, window u-value, roof / ceiling u-value, floor u-value, indoor temperature, design outdoor temperature and air change rate — each field above is adjustable with a slider.
2. House heat loss (kW) is calculated automatically as you type.
3. Check the worked example below to see the formula applied to real numbers.
4. Copy the result or bookmark this calculator.

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