 However, officials with the Delaware Division of Public Health tell the talk of Delmarva a fan may not be enough. Do not rely on a fan alone as your primary cooling device. It can actually be deceptive. You can think with the air flowing on you that you're cooling enough, but you may not be. And you don't want to be tricked into accidentally getting some kind of heat stroke or heat exhaustion because you're not getting enough cool air on you.