I had a very disappointing hatch rate from eggs that I gathered over a 5 day period from my backyard flock, turned twice daily and stored in my office where the temps stayed consistent. 7 out of 30 hatched. I have 4 RIR hens, 2 EE hens and 3 Barred Rock hens running with a RIR roo and an EE roo. The fertility was good as 27 were fertile. The rest stayed in the bator until the 23rd day... The first pip was on the 20th and by the 21st the 7 hatched. I opened the eggs and most of them were pretty well developed. I did have a temp spike around the 17th and it was 105.5 when I returned from work and then on the 19th it dipped to 96.5 when I awoke. Was using a hovabator still air.