We have some large south-facing windows in our house. In the summer, the light coming in can be brutal. Not only does it make our family room too hot, it's even damaged our curtains. I was really impressed with Stellar Energy's presentation. The claimed their tint blocked the sun and kept the window clear. I wasn't totally sure it would work but it DID! Our house doesn't look creepy and tinted from the outside, it's not too dark inside and we aren't miserable in the family room anymore yeah! It wasn't cheap, but it worked.