Some heroes

[hootinnhollerin@lemmy.dbzer0.com]

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[thorry@feddit.org]

YSK: Running your fan when you are not in the room actually warms the room. Fans don't actually cool anything, instead they help the human body more efficiently cool itself. It also helps churn the air in the room, which might make it feel fresher depending on the situation. But it only works directly on humans, because we use evaporation to lose heat. Fans however do use a lot of power and most of that power gets turned into heat, warming the room. So when there's nobody in the room, turn off the fan.

This obviously doesn't apply to fans that draw or push air somewhere else. A fan in a window, with another window open opposite can be useful without anybody around. Pro tip: If you want to cool the room you're going to be (the bedroom for example) using outside air, don't put the fan in the window in that room. It's much more effective to put a fan in another room blowing outside and having the window in the room you want to cool the only other open window. It draws in cool air much faster, cooling down the room. Also don't put the fan directly in the window, fans create a column of air that gets wider with distance. If you put the fan in the window, the column doing the work is about as large as the fan, which is presumably smaller than the window. By putting the fan a bit away from the window, the column can push on the whole area of the window, improving airflow. The optimal location is usually around 1m away. depending on the fan and window.