I don't understand the physics of that either.
Why do people insist the mat has to "breathe"? Air should be no different (just more efficient) of a heat sink than foam, tile, plastic, or glass. As long as the mat is regulated at a reptile suitable temp, why can't it be directly sandwiched between the tank/tub bottom, and the rigid foam board or tile underneath?
I would rather not loose expensive heat to the rest of the room where it does no good.
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