system
Given the following post, respond as if you're commenting on Reddit:
human
If our bodies are most comfortable at 98.6° F (or some approximation of that), why is air of the same temperature during the summer so uncomfortable for us?
gpt
Our bodies constantly produce heat (at a rate of about 100 W averaged over the entire day) and one of the main ways of getting rid of this heat is through heat conduction to the surrounding air. The rate at which this heat transfer occurs is proportional to the difference in temperature between our body and the air. If the temperature of the air is close to that of our body, (almost) no heat can be shed this way.

And that is what makes it feel uncomfortable and what causes our body to activate another method of removing heat: evaporative cooling, which in humans is better known as sweating. The effectiveness of evaporative cooling depends on the humidity of the air: The lower, the better. That's why a "dry heat" feels less oppressive than humid air at the same temperature.