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