Deep Overhangs /Shading Devices
Proper window shading will allow optimal solar heat gain in the winter, while limiting unwanted solar heat gain during the summer. A correctly sized roof overhang will completely shade a window at solar noon on August 21st (the warmest and sunniest month of the year in the northern hemisphere). Windows that face east or west will require larger overhangs, or vertically-mounted shading devices for complete shading. Shading windows from the summer sun will help to maintain comfortable conditions inside a building as well as to considerably lower annual cooling costs.