Just get a large backyard thermometer and prop it up so anyone can see it.Good to know but brings another question to mind. In my ICE vehicle it’s obvious to anyone near that the engine is running. How obvious is it the MME AC is running?
As a rather fanatic dog person, if I see a dog alone in a car on a potentially lethal hot day, the window will remain intact for exactly as long as it takes me to run and get the nearest heavy object. I haven’t ended up arrested yet but frankly I don’t care.
I may print a sign “Electric Vehicle: you don’t hear an engine but the AC is running.”.