My room fan is two decades old (or older) it stays on 24/7 regardless of the weather or temperature. Why? Because one day I got a bit chilly and turned it off and when I turned it back on it made the most horrible screeching noise and slowly rotated to a stop. I left it off for a week before turning it on again and it worked, but poorly. Over the course of a week it regained it's usual vigor and I've never turned it off since as it likely will never, Ever start again.