DON'T put it in the enclosure, as the snake could move it and then the temps would be improperly regulated causing possible harm. put it under the enclosure directly on the heatpad. When I first started I put it in the enclosure and had it taped down, I had it like this for months with no problems, but then I read how tape could come loose and the probe could still get moved, the tape could get tangled on the snake.... etc. So I will never do it again.