There are many DIY bug-fighting measures, as well as good ol' DEET. But researchers have found that fans are one of the most effective bug repellents. It has to do with your breath, as well as your sweat.
You might think it's the sheer air movement of a decently powerful fan that keeps bugs at bay—it keeps them moving, and makes landing on your skin seem like less of a relaxing meal. But the power of fans to keep bugs at bay actually lies in the things your body produces that bugs love, and how fans disperse them or keep them at bay: A fan dilutes and disperses the carbon dioxide you exhale. Carbon dioxide is one of the major chemicals that attract mosquitoes. The wind from a fan also cools you off. Sweat, lactic acid and body heat attract mosquitoes - factors that a fan can help minimize.
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