How much would it add to the cost of a car to put in a little solar panel and a fan or two that would bring in cooler air into the cabin on hot days? It would h

How much would it add to the cost of a car to put in a little solar panel and a fan or two that would bring in cooler air into the cabin on hot days? It would help avoid situations like these (or at least increase chances of survival) and keep the interior from being a scorching simulation of the surface of the sun. I think some models had this in the 90s, but it never caught on. Supposedly, if memory serves from an old issue of Motor Trend, just a couple small fans could drop the temperature almost 20 degrees on really hot days. So a 100 degree interior would be 80, which could mean the difference between life and death.