When the sun hits glass that’s not protected with window film, a significant amount of the sun’s energy—about 90%—is transmitted through the glass. That’s where the heat comes from. To counteract that, installing window film on glass will block up to 80% of the sun’s energy. That means a whole lot less heat is getting through to you. The exact amount of heat absorption and reflectance of the film will depend on the type of film your professional installer recommends for your specific needs. Dyed films do not have metal and are considered non-reflective, and while they absorb solar energy, they’re not as effective at solar control because of their non-reflective property. On the contrary, metalized and nano-ceramic films provide solar absorption and reflectance—and much more solar control—with nano-ceramic film offering the highest levels of solar protection. These films block up to 99% of the sun’s harmful UV rays.