"Waterproof Cooling Fan" at work (assuming no heat transfer with the outside room) not only did not reduce the indoor temperature, it will rise. Let us analyze a temperature rise causes: "Waterproof Cooling Fan" work, since the current through fan coil wire is resistance, it will inevitably produce an exothermic heat outward, so the temperature will increased. But why people will feel cool it? Because the body's surface have a lot of sweat, when after "Waterproof Cooling Fan" Working together, the indoor air can flow together, so we can promote the rapid evaporation of sweat, combined with "evaporative need to absorb a lot of heat" so people will feel to cool.