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I have lived in several concrete slab houses where the floors are always cold. I believe that a carpet manufacture could come up with an insulating carpet pad that would allow retrofitting of floor insulation into all these houses. The second part would be to come up with an electrically heated pad, much like an electric blanket to install in these types of houses. It would lie under the carpet, that would give it some protection from abrasion. The rest of the protection would come in the form of heavy wire insulation. It might be expensive to heat a whole house this way, but it would be good for small areas such as bathroom or living room. It could even be produced in a small portable throw rug type, waterproof of course, for use in a bath room.