I have a few of these. They work great and will easily keep up with winter room temperatures. The down side is that they cost much more to purchase and to operate than flexwatt or a uth. I have 2 by Pro Products and 1 by Reptile Basics. The Pro Products work great but I think that the better thought out design of the Reptile Basics is nicer. www.reptilebasics.com also has an FAQ page for their radiant heat panels which tell you what size that you need for your particular application.