maintaining a safe temp is very important. I read the last post and wanted to amend mine with the following. The "heat pads" that I mentioned using are quite small, and before I even considered using them on sterlite I left them on at full power (these have no controller of their own) for a week and had a digital thermometer attached directly to them. The maximum temp that any of them reached was 110. like I said, hot but not "fire-starting hot". I strongly urge you to use flexwatt of some sort of heat regulating device for your heat pads. My experience may be different than yours, even if you use the exact make and model heat pads that I do. I liked the flexwatt solution because it was by far less expensive than most of the alternatives. My entire snake rack cost me less to build and heat than the one proportional heat controller he mentioned. Safety is ALways the highest concern, but it can be achieved without breaking the bank.