If you have single pane windows or double pane clear glass windows (no low-e coatings) and cannot afford to install new windows, adding low-e ENERGY STAR certified storm windows over your existing windows may be an alternate way to improve the comfort and energy-efficiency of your home. Storm windows may also be an option if you want to keep the historic look of your windows or are required to maintain the look of your windows to meet historic preservation requirements. Storm windows can be installed inside or outside of your existing windows. Learn more about ENERGY STAR certified storm windows at www.energystar.gov/stormwindows and click on the “Buying Guidance” tab.