Exactly, the comfort of temperatures is highly dependent on the ambient humidity. The normal human body temperature is a lot higher than a comfortable room temp

Exactly, the comfort of temperatures is highly dependent on the ambient humidity. The normal human body temperature is a lot higher than a comfortable room temperature, so to be comfortable requires constantly dissipating a significant amount of heat. When the ambient humdidity is low, sweating works efficiently and you don't notice a moderately high temperature, but high temperature and humidity means sweating is inefficient and you end up overheating.