You can eliminate your risk of heat exposure by following these tips:
First, know the symptoms: muscle cramps, dizziness or vomiting, fatigue or fainting, or profuse sweating. Any of these symptoms would mean you are at high risk of heat exhaustion.
At the first sign of these symptoms you should seek medical attention.
Of course, you can help prevent those symptoms by planning for the heat. For example, drink plenty of fluids, plan any strenuous outdoor activity for early or late in the day. Take frequent breaks when working or exercising outside. Wear light, loose-fitting clothes, and never leave anyone in a closed, parked vehicle during hot weather, even for a short period of time.