My temp is about 108 now and he seems to be loving it, I had it at 90 some time ago, but bad idea, he stopped eating and wouldn't poo. they need that warmth to digest and they won't eat unless they are confident they can digest, at least I've learned with mine. Go to petsmart or somewhere and pick up a 100w BASKING bulb, make sure it's for basking and not just for light. keep the light about 12" above the basking area and that should do the trick, u can adjust the height as needed in order to raise or lower the temp in the basking area. good luck! and let me know how he does