ain't Michigan great! I'm still in denial that its nearly fall.

I've always kept a heater in my snake room controlled by a tstat and its worked great. Only comes on when it needs to and makes for keeping the rack and other enclosures at good constant temps. I keep the room just a couple degrees below 80. The room doubles as an office and at any given time there are many computers going so in general the temp is around 80 +/- a couple degrees.