Eli5: if humans run at 37.5 degrees Celsius why do temperatures lower than that feel hotter?

Question

Thinking about this while I sit in 20 degrees heat sweating my ass off. Like shouldn’t anything under 37 degrees feel cold to us?

In: 34

Answer 1

Same reason why your car engine runs at around 100 degrees C (give or take several degrees) but still needs coolant even when the temperature is 0 degrees C outside: because your body generates a lot of heat by doing all of its body functions.