This short YouTube monologue by Derek Cole gives informal advice that you should not leave a fan running when no one is in the room because it provides no benefit to the empty room; the speaker references wind-chill effects and expresses uncertainty about effects in winter or desert conditions.
So if you're not in the room, there's no reason to have the fan on. The fan gives you a wind chill effect, or in this case, in the wintertime, I don't know, like a desert effect. I don't. I'm not sure. But I'm saying that. Say this. Don't leave the fan on when you're not in the room, because it's doing nothing for the room or for anything but have the fan on. So, yes, it does make a difference.
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