Sorry, I should have mentioned this. I have two thermostats. Up until now they have successfully kept temperatures under control. I used to have two thermometers. One with a probe in the warmer hide, and the other other ambient outside the cooler end. Warmer was always constant 90-94, but now for some stupid reason it won't stay constant. I'm using the Accurite thermometer for in-hide and flukers ambient/hydro gauge for humidity.