Im still perfecting that. However, I have set up a basking sight with a heat lamp. I also have dug out the substrate under the hide on the hot side making it shallower and warmer towards the bottom. Typically throughout the day I have observed my substrate to maintain a temperature of about 80 degrees with an ambient temp in the mid 80's. I havent checked how hot the basking sight is but if it is 85 degrees 12" from the basking spot I imagine the basking spot is at least 90 degrees.