Your surface temperatures with a temp gun might be in alignment, but, what are your ambient air temperatures?
Infrared heat mats are not designed to warm air--which is why most people use a Ceramic Heat Emitter (CHE) in their enclosures.
I use only heat mats to run my incubators and I use water as a thermal battery within a relatively sealed and insulated environment to keep the temperature stable. I would not rely on an infrared heating source alone outside of these conditions. A warm snake breathing cold air...not ideal...
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