As long as humidity is ok with just water bowl paper towels will be fine. Also a good thing about paper towels is the heat transfer is good so you can just set thermostat at 90 and you will be good, if you have to use a uth for cool side you can set that thermostat for 81 and you will be good. When you put your uth on make sure your thermostat probe (not thermometer) is sandwiched between uth and bottom of tub.
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