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A ground floor accommodation is equipped with electric floor heating. This heating system being insufficient during periods of extreme cold, is it possible to add a heating mat? Or is it dangerous?

In terms of performance, you do not have to add a thickness on a heated floor, because you create a resistance to the diffusion of heat.
If there is a base "electric ground" is that there is probably a complementary heating system. Why not use it? Otherwise, there is no no danger particular to use a heating mat under these conditions.

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