the best way we could find to keep the humidity between 30 and 35 % was to dampen a paper towel, crumple it loosely and put it in an egg holder. That has been perfect. Just do it in the morning and again at night. We are still having short term temp fluctuations between 97 and 103. Never again without a fan. Lol we've read so often that the eggs neither cool nor heat as fast as the air so we aren't overly concerned. They are probably maintaining an average of 100 at the center level of the egg. Not ideal but should do the trick.