If you wish to cool say, a bedroom before using it, how long prior to going to bed should you start a fan?
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Answers:
Fans don't cool rooms...they cool people! The moving air evaporates the sweat off your skin, that's what cools you down.
Unless the air in that room is hotter than the air in the surrounding atmosphere, there is no point putting on the fan until you are in the room.
tyfgt
Just start the fan when it is convenient for you to do so. A minute before is fine. Turn it so it is pulling air from somewhere where the air is cooler, ideally.
take a hot bath you will feel that the temperature of your surrounding is cooler. in that case, you dont need to precool your room and is good hygiene. you'll probably have a good night sleep
Try ten to fifteen minutes. :)
I think it depends on how hot and/or humid it is, so that's difficult to answer entirely. The other two things I do to keep cool;
1. take a semi cold shower before bed - cools your skin and brings your body temperature down. Even just a short rinse will do this
2. I have something called a "Chillow". It has water in it and you put that in your pillow. Because sealed water left out in room temperature will always be colder than room temperature, it feels cool even when it's very hot - sometimes almost too cold.
As for the fan, the hotter it is, I'd turn it on sooner in the moving back and forth position to circulate air.
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