Even the mid 80's afternoon sun in FL doesn't seem to let much heat in via the roof. I get more heat through the front windshield and the sides. However, it could be a nice addition with a front sunshade to keep the car a bit cooler when left outside.Anyone know the cost? It's been in the 80s quite a bit so far this winter (Florida), but I haven't once felt like I needed to block the glass roof. The real test will be this summer, so glad to know something like this does exist if desired.