No. I incubate mine at 45%. Some people incubate up to 55%. I actually found under 40% to result in too much moisture loss and too large of air sacs so my chicks had trouble hatching. As for temp people have had power outages result in 70-90F for a few hours without issue and eggs will continue to incubate down to 96F. They just do so much slower. 99-100F is what most keep their forced air and you should try to keep the temp from going much over 102. At 103 it starts to become too hot and they could die if incubated too long at that temp. Too low of temps is way better than too high since too low usually just delays hatching while too high can quickly kill.