In my first hatch, I started with 42 eggs. The thermometer read 99F. On day 7 I removed 2 eggs that were clear. On day 11 we had a power shortage for few hours, so I took the incubator to my parents house. after about 12 hours in my parents' house I noticed that the temperature was too high (103F probability because of the different location or altitude) so I lowered it. When I took the incubator back home the temperature was too low (95F), so I raised it again. I thought my chicks died, but surprisingly one hatched on the 19th day, 31 on the 20th day and 6 early on the 21th day. Only one egg didn't hatch (chick died) - over 90% success! For my second hatch I stated again with 42 eggs, but I raised the temperature a little (100F, not too smart...), I had to remove 12 bad eggs during the incubation period, and only 22 hatched, most of them on the 19th day. For my third hatch (current - again 42 eggs) I lowered the temperature (97F), again I had to remove 12 eggs during the process, one has hatched on day 19, 3 on day 20, now on day 21 5 have already hatched. I compared my thermometer with a different thermometer and it does seem to show approx 2 degrees lower. Why was my first hatch so successful what do you think? Another important point is that I keep the hatched chicks near the incubator and they first made a lot of dust in the air since I used dusty soil as bedding. could that cause the low hatch success? I did of course clean the incubator after every hatch. Thanks a lot!