Hello, I am also in MI. with mostly toads (canes,fowler,sonoran). I use a low wattage infrared heat lamp with them and it seems to work fine. The fowler I keep at room temp. as it is native to MI. My frogs (pixie,pac-man) I use a more indirect method as would be afraid of drying them out. Also keep all moist with a water spray. Hope this helps.