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It does not matter what the little knob is set to. It matters what the tub temp is. A temp gun is your best friend. My temp sensors mount 1/4" above the bottom of the tub.... they came with some gizmo to mount the to the tub floor and thats where they sit. Whatever tub has the temp sensor in it is just for that... the temp sensor. I set that tub up just like the others in the rack... aspen, water bowl, etc, except no snake. My room is 82F ambient. Thermostats all set to 88F and all 3 racks have a hot spot of 90-92F. Some have 3" flextape and others have 4". Some racks have 41qt tubs while others have 8qt tubs.
One well known breeder told me to give my bp's a 6-10F range from hot to cold with the hot side 90-92F and to occasionally check the actual body temp of your snakes. He said they will regulate themselves to around 85-86F body temp given a decent range of temp hot to cold side. I've been checking the last week or so and darn it.... they're most all sitting at 85F body temp![]()