Flexwatt is not intended to heat an entire enclosure, only a localized spot on the floor of the cage. In many cases, the temperature you would have to reach at the hot spot to heat a cage to proper ambient temp would cause serious burns on your snakes (definitely good thinking to test it out before putting them in there). Raise the thermostat temp until you achieve the correct hot spot temp (measured with a heat gun or digital thermometer), and then check if you ambient temp is sufficient. If not, you will either need supplemental heat or to raise the temperature of the room you have the cages in.
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