3M Window Films are efficient. Check out this awesome article from our friends at Interwest!
Exposure to direct sunlight can cause many colored or painted materials to fade. Damage due to fading is caused by UV light, visible light, heat (including infrared light), artificial lighting indoors, humidity and poor dye anchorage. The first three cause about 90% of general fading. UV, visible light and heat all pass through ordinary glass and can cause expensive damage to goods and furnishings in offices, retail shops and museums. Sun Control of Minnesota can help with its advanced window film.