What is the safest thing to do for someone suspected to have hyperthermia?

If someone is suspected of having hyperthermia, the safest immediate action is to move them to a cooler environment, ideally an air-conditioned space or a shaded area. Remove any excess clothing and apply cool, wet cloths to their skin or use a fan to increase evaporation. Encourage them to drink cool fluids if they are conscious and able to swallow. If symptoms persist or worsen, seek medical attention promptly.