The majority of window films are applied to the inside of the glass surface of the window. When the sunlight hits the surface of the glass four things happen:
1. The sunlight hits the glass and a part of its energy is reflected away from the window.
2. The glass absorbs some of the sun’s energy.
3. A portion of the sun’s solar energy is transmitted through the window film into the room.
4. Part of the sun’s energy is absorbed by the window film and is re-radiated in and out of the room.