The problem with dial thermometers is they measure air temps, the surface temps can be way higher.
I had a similar setup, and once I purchased an infrared temp gun I was annoyed and surprised how much the temps varied. 92' f, air temp gunned in at 115'f inside her warm side hide. Her cool side (where she stayed) gunned in at 93'f, and air temp was 78'f.
Fixed now, with happy snakes.
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