I didn't use a fan in last year's homemade incubator and it did just fine. Granted I did monitor it carefully, it had three large pop bottles full of water in the bottle (as Derek mentioned) and I wasn't opening it constantly or for more than the few seconds it took to remove an eggbox for a quick peek. Also my incubator sits in a nice warm and very stable closed snake room so it and the eggboxes aren't exposed to any radical temp changes for any length of time. It was also a small incubator so had little airspace to deal with. When we build a larger one a fan will be definitely a big plus.
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