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I think one fan should keep things stirred up. Windows just always cause a little of a cooler spot. The best way is to spot check with the same thermometer. Put it in one place and leave it until it stabilizes, then without changing anything else, put it in another spot until it stabilizes. depending on your incubator how long to leave it. This way you are comparing apples to apples. This way you will know if you have any hot or cold spots and can adjust your plans accordingly. If you add another fan, I like to put them where they don't blow directly on the eggs.
I think one fan should keep things stirred up. Windows just always cause a little of a cooler spot. The best way is to spot check with the same thermometer. Put it in one place and leave it until it stabilizes, then without changing anything else, put it in another spot until it stabilizes. depending on your incubator how long to leave it. This way you are comparing apples to apples. This way you will know if you have any hot or cold spots and can adjust your plans accordingly. If you add another fan, I like to put them where they don't blow directly on the eggs.