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Heat loss by element → energy class + priorities
Area|U-value
Heat loss
class: E (326 кВт·год/м²)
39 145 кВт·год/yr
Q = Σ(U×A×ΔT×24×days)/1000. U-values: brick 1.4, insulated 0.3; old window 2.8, double-glazed 1.1; bare roof 0.9, 200mm wool 0.2. Classes: A<50, B<100, C<150, D<200, E>200 kWh/m²·yr.