You searched for: “thermohypoesthesia
thermhypesthesia, thermohypesthesia, thermohypoesthesia (s) (noun); thermhypesthesias, thermohypesthesias, thermohypoesthesias (pl)
Diminished sensitivity to hot or cold stimuli: As a result of his thermhypesthesia, Clarence was able to hike for miles on a cold day and still be comfortable.

Hans was sweating less than usual when he was climbing up the mountain which suggested that he was experiencing thermhypesthesia.

thermohypoesthesia (s) (noun), thermohypoesthesias (pl)
A lack of sensibility to heat stimuli: Mr. Johnson’s hands had thick calluses on them as a result of his working on the railroads which caused thermohypoesthesia or being unaware of anything being very hot whenever he happened to touch any excessively hot objects.