I have a slab on grade 3 season room (about 200 s.f.) that we can use most of the year in central IL. The little space heaters do a pretty good job except for extremely cold weather. The only problem is that the floor stays very cold. Is it possible to install the sub floor heat directly on the concrete?. I figure I'd need a GFCI, at least. It's a short run to a relatively new 200A panel, and I don't mind the expense of the electrical, because we mainly want to make it more livable for those in between times.
If I can install that kind of heat, what are my flooring limitations?
Many thanks in advance., Allen O.