Why an electric fan can make you hotter in extreme heat — and what to do instead

August 1, 2026 - 06:26

The Centers for Disease Control and Prevention has issued a warning that might surprise many people: using an electric fan during extreme heat can actually increase your body temperature instead of cooling you down. This happens when the air temperature climbs above your normal skin temperature, which is around 95 degrees Fahrenheit. At that point, a fan just blows hot air onto your body, and it can speed up dehydration and heat stress rather than provide relief.

The CDC points out that fans work by moving air across your skin to help sweat evaporate. But when the air itself is hotter than your skin, that evaporation stops working the way it should. Instead, the fan pushes heat toward you, making you feel worse. The agency advises that fans are only safe and effective when the air temperature is below 95 degrees. Once the mercury goes higher, you need to switch to other methods.

So what should you do instead? The best option is to find an air-conditioned space, even if it is just for a few hours. If you do not have AC at home, try a public library, a shopping mall, or a cooling center. Taking a cool shower or bath also works well, as does applying cold, wet cloths to your wrists, neck, and forehead. You can also close your curtains or blinds during the day to block out direct sunlight, and use a cross-breeze by opening windows on opposite sides of the house during the cooler evening hours.

Another useful trick is to wet a towel and place it in front of a fan, but only if the room temperature is below the danger zone. The evaporation from the wet towel will cool the air slightly. Also, remember to drink plenty of water even if you do not feel thirsty, since heat stress can sneak up on you. Avoid alcohol and caffeine, because they can dehydrate you faster.

The bottom line is simple: when the heat index hits 95 degrees or higher, put the fan away and look for real cooling methods. Your body will thank you.