I have been useing a Little Giant now for three years and so far I have never had any issues with temp control as well as humidity ?. I keep it in a room that stays at a consistant temp and I also installed a computor fan in mine and I do use a turner though ..I would be interested in learning more about not useing a turner and not turning eggs ?
I have a small yellow book by Janet Stromberg. A Guide to Better Hathcing. I highly recommend this book for the detail of information, for even us casual hatchers. A hen shifts her eggs 96 times in 24 hours. Egg should be turned a minimum of 3 times a day, preferably 5 times.
A study was already done on "to turn or not to turn". I will see if I can find it. In the mean time, the summary is that turning the first 7 days is critical to obtain high hatch rates, the other two weeks it is not as critical but the hatch rate is more when the eggs are turned.