Yes I know about this - it's due to sweating i.e. evaporation. I would rather avoid this and cool down with a cold drink! Works for me.I used to go to a Chinese takeaway that had no air conditioning; just the exhaust fans over the woks. On hot Summer days when it would get above 35°C, the cooks and counter staff would drink a lukewarm tea made of some kind of young bamboo shoots and roots. I couldn't understand how they could drink something warm when the temp by the woks had to be 46°, but they said it cooled them down. It must work because I would have melted in such a place, but they were fine working 12 hour days, day after day.