ZapCarM3
Member
I think it's BS because think about it this way. If the tint is what causes the window to break from heating up, it simply means the window is allowing heat to pass through (unless there's tint on the interior.)Has anyone actually had their roof glass crack from tinting it? I have read in several threads not to do it but it all seems to be a rumor. Is the glass that bad?
I have two other cars currently with pano roofs. One of them has had roof window tint for 7 years now with absolutely no issues. It has spent time in the hot parts of SoCal, Death Valley, Las Vegas, Texas and now Florida for the past three years with no issues. It had a retractable sunshade that helped but until I added tint, I could definitely feel the heat on my head.
The other car has lived is life in the south and it had a much better sunshade arrangement. Still tinting its window really cut down on how hard the AC worked and much cooler when you get in the car.
The tint definitely saved my interior on the first car as it was parked outside all of its life. Even in 115F temps in Death Valley, the tint helped out the car's AC. I also did window tint but the area of the roof was large compared to the windows.
So if I could use tint on the roof of the Tesla I will order this week, it would be a major plus.
I have no doubt it might send a bit back into the glass but I also imagine not having it, having the car heat up more, would heat up the glass about the same.
I wonder how much of the heat I feel is from whatever heat causing rays make it through vs the glass just heating up and therefore heating up the air around it.
I'm certain the most productive thing would be to have an exterior tint to reflect those rays before it got into the glass at all but I know that probably isn't a realistic path to choose, tragically. It's a very clever idea but I'm sure the tint would fail very quickly.
I read that uva and uvb only make up about 3% of the heat. IR about 48% and visible spectrum about 42% and the rest is other stuff. So even a full UV and IR blocking tint will not eliminate all the heat since visible light needs to get through so we can see. In this case, I suppose the darker tint does start to make up a bit of the difference. By how much? I'm not sure. Whatever about 40% is of the difference between each incremental step of how they rate tint and it's darkness, maybe.