I was dog sitting for 12 days while friends went out of town.
I noticed that they had the AC on and ceiling fans in 3 rooms that were spinning. Is there any good reason to run the fans?
I would think the fans do nothing but blow the hot air near the ceiling down, so that the AC has to cool all the air in the room. When evrything they want to cool is no more than 4 feet high. Surely the top half of the walls won't be damaged if they are a few degrees hotter than the bottom half, right?
So the AC costs more, and the fans themselves use some electricty (I don't know how much). I don't to suggest to them that this is a bad idea if there is even one reason why it is a good reason.
P.S. A few years ago when I did this, I thought they left the AC on by accident, but the wife is very worried about her piano being damaged by hot weather. ?? My mother and then I have had a piano for 61 years, second hand when she bought it, and almost never used AC and almost never used a humidifier, and it's fine. But maybe it's a better piano than my friends have.