Quote: im one of the other style hatchers,  i agree with ozexpat on messing with a thermostat; it is a chick killer.  more so because you end up baking the chicks.  a little cooler temps for a few hours wont affect a hatch much at all. the opening the door thing is an old timer's method for increased ventilation, there is a lot of proof that the chicks do excersize more because of the cool blast.  now with ozexpat's eggs he probably sets them on end to help fix displaced air cells from hauling - this is an issue i normally dont have because i hatch my own eggs. anything i have shipped in is set on end,  i personally have not had any luck putting shipped eggs under a broody.
 
hatching is something like raising chickens, what works for me will not always work for you.  the whole temp and humidity rules are more of a place to start and not the gold standard.  i am at the point where i cant come close to telling you how many hatches i have had, or even how many chicks i have hatched.  but i can tell you there is always something to learn from someone else.  im envious of ozexpat's incubator, i hope to build one soon.  since i have been on BYC i have probably passed out SallySunshine's articles well over 100 times. i also talk to Sumi a lot.  she is great at narrowing down problems and getting people started.