>The TWG also strongly recommends that, as part of a public education program, cities emphasize that portable electric fans are not the simple cooling solution

>The TWG also strongly recommends that, as part of a public education program, cities emphasize that portable electric fans are not the simple cooling solution they appear to be. Because of the limits of conduction and convection, using a portable electric fan alone when heat index temperatures exceed 99°f actually increases the heat stress the body must respond to by blowing air that is warmer than the ideal body temperature over the skin surface (American Medical Association Council on Scientific Affairs, 1997; CDC, 2004c). In these conditions, portable electric fans provide a cooling effect by evaporating sweat. The increased circulation of hot air and increased sweat evaporation can, however, speed the onset of heat-attributable conditions (e.g., heat exhaustion). Appendix B also warns you about the extreme dangers of a fan.