I agree to both posts, 3M and formula one makes great films and the specs are available at their website. I have rear climate with tinted windows but I still tint them anyway. I normally get 5% tint in the rear and 10% in the front. I live in SoCal and it gets pretty hot where I live in the summer time, besides, we can get away with really dark tinted windows here in L.A. Not sure about tinting laws in other states. I suggest going to the Better Business Bureau (BBB) website in your area (if available) to find a reputable auto tinting company. It's one thing to get good film but installation is another story. Good luck.