// multi-utility computation suite · offline · instant · precise
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build.window-heat-loss Calculator
Calculates heat loss through glazing from window area, U-value, and design temperature difference, and the offsetting solar heat gain from SHGC. Low-e triple-glazed windows achieve U-values below 0.2 W/m²·K, reducing heating load by 80% vs. single-pane.
Inputs
Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
U Value
Reference formula or conversion factor shown for context.
Delta T
Reference formula or conversion factor shown for context.
Shgc
Reference formula or conversion factor shown for context.
Results
heat loss (W)
The decrease or degradation from the baseline.
solar gain (W, est.)
The improvement or increase over the baseline.
net at peak (W)
The value at the specified point or condition.
annual heating loss (kWh)
The result expressed on a per-year basis.
U-value (W/m^2K)
The computed numeric or monetary value.
triple glazed
Reference formula or conversion factor shown for context.