I went to have the two front windows tinted today and on an impulse also tinted the windshield. It is not legal of course but you don't even know if it is there. I got the max light transmissibility type for the windshield. What a difference it made. Driving around in Texas sun today with outside around 78F and still do not have to turn on the AC with all the windows closed. I can not roll down the window for another week anyway.