Try to convince someone who thinks something trivial is of extreme importance, that it is trivial!

It is always better to think well of your fellow man rather than badly of them!

If the heater in a car 🚗 doesn’t really consume any energy because it draws the heat from the engine. Then it would only make sense that the air conditioner in a car 🚗 doesn’t really consume any energy because it draws cold air from the engine [now what kind of an engine would that be?].