"220V AC Cooling Fan" main components are: AC motor. Its working principle is: energized coil in a magnetic field force and rotation. Form of energy conversion that is: the main energy into mechanical energy, and the coil has a resistor, so there is inevitably a part of energy to be converted into heat. "220V AC Cooling Fan" at work (assuming no heat transfer with the outside room) not only did not reduce indoor temperatures, but will rise. Let us analyze a temperature rise of reasons: when fans work, due to the current through the fan coil wire is resistance, it will inevitably produce heat outwards exothermic, so the temperature will rise. But why people feel cool it? Because the body's surface has a lot of sweat, when working together after fans, indoor air can flow together, so "220V AC Cooling Fan" will be able to promote the rapid evaporation of sweat, with "evaporation need to absorb a lot of heat," so people will feel cool.