The thing I've found with heat mats is that they don't radiate heat. If you place your hand on a heat mat you will feel the heat, if you raise your hand above a heat mat you feel no heat. So the only benefit would come if the tortoise was in pretty much direct contact with the mat. I think there are better ways to keep a tortoise warm overnight such as ceramic or tubular heaters which do radiate heat either in a spot or throughout.
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