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The perfect time to place your fan in front of the window
However, this method doesn’t work at any time of day. For it to be truly effective, the outside air must be cooler than the inside air.
This situation often occurs in the evening or during the night. After a sunny day, the walls, floors, and furniture continue to release the stored heat. Meanwhile, the outside temperature gradually begins to decrease.
It is precisely at this time that an outward-facing fan can help accelerate the cooling of the home. Very early morning is also a good time to remove residual heat before the return of high temperatures.
Conversely, during the hottest hours of the day, it is generally preferable to keep windows, curtains and shutters closed in order to limit heat gain.