Hi. First let me say thanks for the help. I have a tank from The Reptile Factory that my wife and I picked up at the Midwest Reptile Show in August. We're running an under tank heater controlled by Jump Start MTPRTC, Digital ETL-Certified Heat Mat Thermostat. My cold side temps are holding a steady 77 degrees and my humidity is around 60 %. I have a digital thermometer with temperature probe made by Zoo Med. My inside temperature probe is on the bottom of the enclosure while my probe connected to the under tank heater/thermostat is taped to the bottom side of the tank. My under tank heater is sitting on a piece of tile and my enclosure is supported by being stacked on three pieces of tile. I'm showing a difference of eight degrees between my the thermometer on my hot side and the temperature reading on my thermostat. I'm struggling with maintaining an appropriate hot side temperature. Sorry for the long detailed message, I just wanted to provide as much information as possible.