That's part of the reason that I switched to a vent mount, for my MoPho car dock. I realized that, even with the AC on, the phone was just soaking up the heat from the sun (when on the dash...can't put on center windshield in CA). With the AC mount, I lose one of the vents, but it also keeps the phone cool on Sunny days. In L.A., obviously, it proved to be the best move. So, for those of you that live in areas that have a lot of sun, and you're willing to sacrifice "full" use of one of your vents, it's an option worth exploring.