The tub built a lot of condensation since I set it up, this is the first day with eggs in it. You are right though, for some reason the way I have it setup, inside the tub is a couple degrees warmer than inside the incubator. I never figured out why but I have herpstat probe in the the incubator set at 87 and the wireless probe for my weather station in the tub. Inside the tub reads 88. It's been like this since I set it up a month ago.