* In summer, excess heat comes in west and east facing windows. The heat generated by one 6 ft by 6 ft window facing east or west is equivalent to burning one gallon of oil in the building each summer day! ! ! !From April through September the sun rises in the northeast and sets in the northwest, glaring high overhead midday.
* In winter, when the sun appears low in the southern sky, welcome warmth enters the building through south facing windows. West and east facing windows get only a few hours winter sunlight while losing far more heat than they gain.
Ancestral use of natural shading.
Shading Overhang over South Window
A properly sized overhang shades south-facing windows from the high summer sun, yet allows the warmth from the low winter sun to enter during the cold months.