I have belly heat in my rack in the form of 3 zoomed 30-40 gallon heating pads taped to the backside of my 41q tubs. They were leftover from my tank days and since I never removed the covering from them, they were good to go on the tubs. They do an amazing job! The only extra thing I have to do is run heat cable through the one empty spot above my ball python so that way the heat soaks through the wood (takes about an hour) and heats the space under it. Perfect way to achieve ambient temps while keeping my room cool!