I don't know if I was clear enough, but it is the belly temp that I am talking about. The temp on the substrate itself as measured by a PE-2 temp gun is about 92. But in order to achieve that, the temp measured on the glass (under the substrate) is 104. I already have a CHE that keeps the ambient temp up.
You were clear enough. And I'm saying that your snake is going to go to the hot spot, which is down below, so THAT needs to be 92.
I lost my snake for a couple of days under the substrate. I only found where he was because I could see tunnels in it.