My aunts mother in law used to hatch eggs on the woodstove in the winter time. I dont know what she used to sit on top of the stove. But she said she got it from her mother.. I guess they didnt even have electric in their house when she was a kid.. It worked for her.. But I know it had to be watched closely and all them time.. She did it one time when we were visiting for the holidays.. She got a few to hatch before we left.. I thought it couldnt be done..
But I have never heard of any one doing it in a regular oven.. I dont see how you could keep it cool enough..