I am currently using a ZooMed heat mat, and I have it on a rheostat. It's just where it needs to be on almost the lowest setting. Even the mini Zoomeds can go over 100* through glass (Mine did while I was working on finding the best setting, but it was a really short period of time) so you will probably want at least a rheostat. I'm not sure how well things heat through wood, but better be safe than sorry.