They probably drive a car where they can tell the car to warm or cool the cabin remotely. My problem is opposite yours, even with the windscreen covered the car will heat to 50°C (112°F) and if sunlight was on anything, that thing will be too hot to touch.

So I tell my car to keep the air con on while I’m in the shops, tell it to start cooling when I’m returning to it after I’ve been away longer than I like to run AC

In your scenario, I would ask the car to be warm an hour before I needed it