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Your idea would work if the window and fan were large enough that the air inside the coop migrated out to the warmer air faster than the warm outside air would replace it. It becomes a problem with efficiency. How large would the window, fan, and ice packs need to be in order to...
I took a refrigeration fundamentals course last spring semester at a community college, and despite the poor grade of a 'B' (should have had a C in my opinion), I did learn a thing or two. One of them is that warmer air always migrates to cooler air, and the other thing is that there is no such...