I've got eggs in the bator that are about 12 days today and my temps in the hova bator 1602 have been steady at 100.9 on top of the eggs (no air fan). Just a little while ago I walked by and happened to look thru the window and I saw a reading of 104 deg! WTHeck????? I read something on here about temp rises in the styrofoam bators due to chick development but can't remember when it could happen. Also, the temps in the house have been fairly steady. The bator is in the hallway near the thermostat (bator on floor, thermostat on wall) so the temps there are the least fluctuating. Soooo......is it the bator or the eggs causing these crazy fluctuations? I swear I need to make watching this bator a full time job. I've got Serama eggs in there I paid a handsome price for and I've candled and taken out the quitters so I'd like to not lose any more due to scrambling them in the shell thanks to bator hell.