Yeah, heat tape is one of those things that the area the enclosure of the room is in, the bedding, the tubs.... anything can be a factor in how to set your thermostat.
Generally the higher up in a rack the tub is the higher the heat tends to be.... So I aim for a comfortable setting in the middle of the rack shelf. One of mine is set to 92 in order t o keep a cozy 88 heat spot on one rack....
Another is set to 95 because it's in a cooler room and that's where it needs to be to keep that 88.
And as a warning it's not something to set and forget. You should be doublechecking temps from time to time. Pick a shelf on each rack at random and check the temps. I was starting to get a bit more lax in my checks until I purchased a used AP rack a few months back. One with burn damage because the bottom shelf's tape heated up burning the rack and a hole in the actual tub 0_0;;
Thankfully the snake in there was fine per the old owner and is one of the ones in my current possession as well.... but still a lesson to remind me to stay vigilant.
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