Passivhaus is not passive solar

When we calculate the net energy gain and amortise the cost of glazing over an assumed life of say 20 years, we find the cost of free solar heat through south glazing is about 50p/kWh. If the window area is required for daylight, ventilation, views and other functions then the heat really is free. If not, then extra glazing is an expensive way of providing heat!

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