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In summers i.e. now, my room has hot uncomfortable air in night,but outside air is cold 4-5 degrees Celsius colder than inside, my room has windows parallel to wind flow, so though wind flows in night it is parallel to my door. Keeping door open doesn't help either it does not replace warm air fast enough.

My assertion is that if I keep a table fan near door will it help drive cold air inside? How feasible is this solution? Does fluid dynamics provide solution?

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  • $\begingroup$ if you put it on the doorstep it should, since it makes an underpressure behind the fan blades, $\endgroup$ – anna v Mar 27 at 10:06
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Yes sure. This is same as an exhaust fan and ventilators. It will help in driving cold air in.

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A way for air to go in and then another way for the air to go out, accompanied with a fan both places is best, though one fan is better than none. There are even those window fans that are two small fans that can run in opposite directions if only one window is available.

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