I got a thermostat yesturday as well and its directely on the UTH and the thermometer is directely above the bedding on the warm side and on the cool sides its near the lid. The sensor for the humidity is in the middle of the cage. With this set-up I descovered my bedding is WAY too think and blocking ALOT of heat from my UTH and will have to move alot of it out of the way so his hide on the warm side gets the heat from it. Also descovered that CHE are the devil, even if you use a blue bulb, it still eats the hell out of your humidity.