OK, forgive the newbie question, but this cool down period, do you have to do that? Could this be why my eggs in the incubator previously did not develop? We have new eggs in there we started two days ago, if this is necisary on all hatches, when do you start it? right at day one, or what day? Thank you so much!!! this is in a still air with no turners. we are opening it three times per day to turn eggs, so does that count as the cool down period?