I often hear people suggest switching the direction of a ceiling fan from 'blow' to 'suck' or the reverse, thinking that one will draw cool air in better. My intuition tells me that: - a ceiling fan blows air in a doughnut patterrn, where air flows either up in the centre or down in the centre, and that - both directions are equally effective (or ineffective) in circulating air in the room, and thus circulating air to outside and from outside the room too. - the only real difference between the two directions on a ceiling fan is whether or not you feel the breeze (you will feel a breeze in the room if the fan is switched to downwards, the breeze in the room will be much less noticeable if the fan is switched to upwards) - that the idea behind a reversible fan is merely one of whether or not you want to feel a breeze or not (eg. you might not want a breeze when operating it in the winter, thus you would switch it to upwards) In short, I do not believe that reversing the direction of a ceiling fan will have any effect on its circulating ability and thus its cooling ability. Can someone clarify?