Well, I used to live in a house with a huge ass attic fan, which only went one direction, and my opinion is it doesn't matter much just as long as there is air circulating round the house.
If it's cooler outside than in, it seems like the fan should be blowing into the house, and the reverse if it's hotter outside than in, however, I believe it doesn't matter much what direction the wind is blowing as long as the wind is blowing or at least that's how it seems to me.
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