Depending on what type of enclosure you have depends on where you need a thermoSTAT. You will need a thermoSTAT to regulate ALL of your heat sources. You only need one uth (regulated with a thermoSTAT)on your snakes hot side and not on the cool side. You need a thermoMETER to see what the ambient air temp is (80) and humidity levels (60). Both are required and not an option along with your temp gun.