The Efficiency of Window Shades

Energy Efficiency Study

• A 2009 study conducted by the University of Pennsylvania examined the thermal efficiency of window shades. The research results, which were presented at the Eleventh Annual International Building Performance Simulation Association Convention, revealed that window shades reduce energy consumption. The researchers also found window shades to be particularly effective in improving the thermal condition of inefficient windows.

Energy and Cost Saving Stats

• According to the website, “HouseLogic,” installing 15 energy-efficient window shades, or similar window coverings, can reduce annual energy costs by $150. However, it may take 15 years to recoup this cost savings. In addition, many energy-efficient measures qualify for federal tax credits, and some brands of energy-efficient window shades are eligible for a 10 percent tax credit of up to $500. Check with the manufacturer, however, to ensure that you are purchasing a qualifying brand.

Most Efficient Shades

• There are many types of window shades available, but U.S. Department of Energy states that dual shades are more efficient than regular shades. Dual shades have a white, heat-reflective side, and a black, heat-absorbing side. The white side should face the window during the summer, and the dark side should face the window during the winter. Quilted and honeycomb window shades contain several layers of material and are sealed on the end to provide insulation and prevent air seepage.

More Efficiency Tips

• For the greatest energy efficiency, place the shades as close to the window and walls as possible. In summer, keep shades lowered on the southern side of the house during the day to limit the amount of hot air entering the room. In winter, shades on the southern side of the house should be up during the day to increase the amount of heat entering the room.