It's very important that you get a Digital Thermometer and a Temp gun, both are pretty cheap. I keep my heated spot under the hide about 90F. Of course due to room temp, it goes up or down a little. When a snake gets to hot, it leaves that area to cool down. For example, when the hide spot gets around 93-95F, he moves to the other side for a couple hrs and then goes back.

This is pretty natural for reptiles.