I am using a repti temp rheostat at the moment. I just can't afford 300 bucks yet for the thermostat. I keep my basking temp 90-93. At night my house gets cold so I usually have the tank around 75 if I don't use the light. So I have had to set the light on intervals to keep the ambient temp up. If left on all night I'm certain the lowest I can get the basking temp will be 100... And as I said off all night the ambient around 75 maybe lower.

So if I turn off the uth and on the light it'll be more around 83-85.