>My fridge: should I improperly close its door, it'll emit some faint noise for like 30 seconds. It's a totally valid important notification, as nobody wants to burn electricity to cold the room while the food goes bad.

Note that it actually won't cool the room. It'll heat the room. The fridge works by putting hot air out the back. The more the fridge cools, the more hot air it puts out. The hot air is always more than the cool air.

If the fridge was vented outdoors, like A/C, then it would cool the room.