It???s hot underground. Here???s a few tips to help you TRY to stay cool as you commute on the subways.5 Ways to stay cool on subway: 1 Fan yourself with magazine, newspaper or ipad. 2 Move very slowly. 3. Stand by the doors on the north/south ends of the cars (the doors you would use to travel between cars). That???s where the air flow from the A/C units are strongest. 4. Carry a cold drink. Dose yourself with it. 5. Avoid crowd cars. Wait for an empty train if you can.