system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why aren't refrigerators placed against the outdoor wall with a ventilator that just lets in cold air if the temperature is cold enough outside?

Wouldn't electricity be saved if refrigerators were cooled down with outside air when the temperature is cold enough?
gpt
Refrigerators, just like air conditioning, are not just about keeping things cold.  They also keep things dry.  By letting in outside air, the humidity levels in your refrigerator would rise, which would cause food to spoil much more quickly.