What type of window treatments are the best for energy efficiency?

Answer 1

The U.S. Department of Energy has several suggestions of energy-efficient window treatments. Awnings on south- and west-facing windows help prevent heat gain during the summer. Window blinds can prevent heat gain in summer, but are less effective at preventing winter heat loss. Draperies can prevent heat gain in summer and heat loss in winter, but their effectiveness depends on a variety of factors, including size (extending high above the window and onto the floor is best) and whether they are sealed at the edges. High-reflectivity films block heat gain, which is good in summer, but can be energy inefficient in winter. Storm panels can be added onto windows during the winter to prevent heat loss and then removed during the summer.