the thermostat probe should NOT be inside the enclosure. it can be moved, urinated/defecated on, come in contact with water, which can cause an inaccurate reading, resulting in a heat spike or drop. the thermostat probe should be sandwiched between the outside bottom of the enclosure and the UTH where it has very little chance of moving or having any variables which can fluctuate the temperature.
if you have a UTH that is adhesive, you can use aluminum tape to adhere the thermostat probe to the underside of the UTH, or veeerrry carefully pull down a corner of the UTH and slip the probe inside. be VERY careful pulling up the UTH as they are NOT meant to be removed and you can easily damage the internals.
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