Does your heater come on at night to warm your house? I know the room temp can really change the effectiveness of the thermostat control in some bators.I have to figure out what makes my temp. spike at night. I think that it's diminishing water in the well, but that's just a guess, and a non-scientific one at that. Last night's spike wasn't as high, though (we turned the incubator down quite a bit). It was within normal limits for a still air incubator so I'm just going to relax about it.
About hatching in the fall: we got our four girls as one-day-old chicks last October and wintered them in the house at first, then in the garage with lamps. It worked out well so we'll do the same thing again, only we're starting from eggs. I liked having my girls start laying in the spring...then we got eggs from them all summer long. Hopefully that will be the case again.