Ahh I see. I've only ever used them secured to the outside of turtle tubs. In both cases they are in direct contact with the thing they are warming (substrate/water (indirectly, the mat heats the tub, the tub heats the water)) and the animal absorbs the heat indirectly. Strikes me that they are not efficient at heating air so securing to the wall or roof of a hide might be an inefficient method.
I suppose there's the possibility of a tortoise digging down to get closer to the heat and therefore coming into direct contact with a mat positioned sub strata?
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