I see the ultimate solution to be a way of making cars not be hot when parked. I live in Florida, and the first 10 minutes of every car ride is the AC trying to get rid of the residual heat from being parked. I would happily spend $5000 more on a car that was not a hot-box when parked. There is no law of physics that says that the car interior must be sealed when the occupant leaves the car.

There are third-party solutions like https://www.walmart.com/ip/Solar-Powered-Car-Vent-Window-Fan... , but this is just a workaround for the fact that the typical car is not properly vented for a warm climate while parked. I understand that there are theft concerns with more venting, and that for cars in cold climates you would rather the car hold its heat while parked. Nevertheless, I think that car companies could solve this problem easily by having extra vents which would open when the car was put in park to keep the car interior at around the same temperature as the outside air.