If your home has single-pane windows, as almost half of U.S. homes do, consider replacing them. New double-pane windows with high-performance glass are available on the market. In colder climates, select windows that are gas filled with low-emissivity (low-e) coatings on the glass to reduce heat loss. If you decide not to replace your windows, there are other ways to improve their performance. In cold climates, close your curtains and shades at night, and open them during the day. Installing storm windows can also reduce your heat loss, by up to 50 percent. Check out Windows for more tips. This tip is brought to you by the U.S. Department of Energy and ISU Extension.