When you treat existing windows with energy-saving film, the sun will shine in your home in a whole new way: with less heat, less glare and more comfort. Professionally applied to the interior surface of your windows, energy-saving film helps keep out heat, glare, and harmful UV rays, but lets in the light. As a result, the temperature in your home or office stays comfortable-while reducing your cooling costs. So go ahead, open the curtains and shades and let the sunshine in.