I've been wondering this. I don't plan to actually do it, but my oven has a "warm" setting of 100 degrees, and it's gotten me wondering whether, in a pinch, it couldn't be used to incubate. It's a double oven, with a small oven on top and larger on bottom, so it could be used to cook in one portion and leave the other for incubating. The bottom section is convection, so it contains a circulating fan. I don't know about ventilation--I could see that being a problem. Humidity could be solved with a pan of water in the bottom. Anyone ever done this? Are there any problems with it that I'm not seeing (other than the obvious one of the husband thinking you're insane and/or doing something awful like messing with the oven temp)? How much do temps fluctuate in a warm oven? I think it would be useful to know in case of sudden incubator failure or a broody abandoning her nest while my bator is full, or whatever. Thanks!