Originally Posted by
LawrenceMD 
I'm so glad I bought a car last year... I use it as my personal air-conditioned pod on days like this. I'll just pay for parking if I'm going somewhere and park as close as possible to where I have to be.
"taking a cab" is a gamble too - because sometimes those motherfuckers just roll down their windows and you still sit in a hot leather lined box. You're going to have better odds that the subway will be nice and air-conditioned (but you have to go underground and sit in the stifling heat while waiting for it).
as to your question about sweating even when its below 37ºC/98ºF? its all about humidity, evaporation, and the
maintenance of 98ºF. to maintain your core body temp you have to have your skin sweat and evaporate. to evaporate the temperature must be lower on the outside of your skin - and the air must be drier.
The higher the humidity the more impediment against evaporation - the more chance of having your core temp going higher than normal - and eventual "heat stroke". 50% humidity on a 80ºF day? bad day to exercise outside.... but you'll be fine in situations like dry heat (think las vegas) with temps well above 100ºF.
dry heat you have to worry more about dehydration (just as dangerous).
so it sucks to be out in the heat. air conditioners do exactly as describe (they take the moisture out of the air and blow dry air at you) cooling is only half of the equation.
eventually though your body acclimates (takes about a week to two weeks) and you can actually perform pretty well in the hot and humid - its why american football has two a day practices in the summer... and why southern girls are described as "warm blooded" and are super slutty.