I thought I'd revive this old thread by listing some stats from my ceramic window tint. While the heat rejecting benefits are well-known, I've been monitoring the temp in my truck during this heat wave the last few weeks and the high temp has been consistently about 7-9 degrees higher than the air temp. For instance, today the high in my area was 112 and the temp in my truck topped out at 120. I go a remote outdoor air sensor and placed it in the lower door pocket of the driver's door. so it wouldn't be in the sun. I also use a windshield sunshade to help protect the leather dash. Needles to say, I'm pretty happy with less than 10 degrees higher than the outside air temp. Well worth the dollars spent.