The Basics of Window Film: Types, Tints, and How They Work

https://papa-wiki.win/index.php/Choosing_the_Right_Window_Film_for_Your_Home:_A_Practical_Guide

Window film sits on the surface of glass and alters the way light and heat move through a pane. It is not a magic fix, but a practical tool that can change comfort, energy use, and even how a space feels