Long description

A diagram with a rectangle representing a building with a line-drawn compass showing north, south, east and west (north at the top of the image) superimposed over the top.

The longer facade of the rectangle faces just to the east of south so as to receive the most winter warmth – a ‘Sun’ in the bottom right of the diagram with an arrow leading to this facade is labelled ‘maximum heat gain in winter’. The shorter facade faces the south-west, the direction of highest solar gain in summer (as described in the text). A Sun in the bottom left with an arrow pointing to this facade is labelled ‘maximum heat gain in summer’.