I bought reptibark which says made of douglas fir. so im confused. maybe its treated, dried or whatever. anyways. I am going to go out today and buy this thermostat. I found my buddy went into his rockcave I gave him so thats good! no more hanging in the tree like a snake monkey! One concern, m digital thermometer with probe says the hot side this morning is 121! but not until it got that hot he came down from the tree. i touched the surface where the probe is and it feels a little warm but nothing crazy at all. In fact I bet it feels about 90 because my house is chilled at 75 right now. think my thermometer is bad? I think I am going to try to measure with another tool I have.