I started a Hovabator with 41 chickens last week. I let it run for two days to set the temperature. The day after I put the eggs in was a very sunny warm day, and the room with the incubator got a little warm. When I got home from work, the thermometer that I trust the most said 104.7. I was sure I cooked the whole batch! I took off the lid to cool things down, and got them back to about 100. When I checked about an hour later it was 102 (residual heat in eggs?) So I took the lid off again and baby sat them for about an hour until I liked the temperature. Then I turned the heater on for that room so that the room wouldn't cool if the weather got cold again (Good thing too. 3" of snow and still falling). I candled them at day 7, expecting to see a bunch of dead eggs. I found one unfertilized, one blood ring, and one with a large air sack because the shell was cracked. The rest all look good. Since then temps have been very steady. Can anyone tell me if this batch is likely to suffer any developmental or hatching effects from a first day spike?