We try to keep the eggs at around 18c.
There is a little more detail on the website Instructables. Also a lot more Poultry ideas. http://www.instructables.com/
Just yesterday, this is what the Site Editor said in an email to me.
"Your Photos Instructable Pre-Incubation Egg Turner has been...
It has taken a fair bit of toil but we are finally on the chicken road. Of our first incubation of 21 eggs, 18 hatched (86% where 55-60% is normal). We have 36 fertilized eggs ready to go again in three days and these eggs are again stored correctly, all within the timeline and turned each day...