(A fridge is a device for redistributing heat, from the closed inside to the ventilated coils outside at the back. To do so it uses energy, and it generates heat in the process. Normally, the thermostat cuts in to stop it for a while once it reaches a target balance. But if you leave it open so that warm air can get in, it will run continuously – and all that you basically have then is a very inefficient room heater.
(AC is just the same – but it works because you’re effectively inside the fridge.)
Panel 2: Cartoon logic.
(A fridge is a device for redistributing heat, from the closed inside to the ventilated coils outside at the back. To do so it uses energy, and it generates heat in the process. Normally, the thermostat cuts in to stop it for a while once it reaches a target balance. But if you leave it open so that warm air can get in, it will run continuously – and all that you basically have then is a very inefficient room heater.
(AC is just the same – but it works because you’re effectively inside the fridge.)