When the weather is warm, window film can reduce air conditioning costs and save on lighting costs by reducing solar heat gain, while still letting in natural light. When it’s cold outside, window film can retain interior heat, saving on heating costs. In existing commercial structures, the energy savings achieved by window film can offer a payback in less than two years, or up to a 70% ROI — depending on factors such as construction, location, and type of film used. Window films can block up to 86% of the sun’s heat. A significant reduction of the sun’s heat aids in a building’s energy efficiency as less energy is needed from the HVAC cooling system — saving up to 30% of a building’s cooling costs.