"220V AC 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 cause of temperature rise: When fans work, due to current through fan coil wire is resistance, "220V AC Cooling Fan" it will inevitably produce an exothermic heat outward, so the temperature will rise. But why people will feel cool it? Because the body's surface have a lot of sweat, When fans work together, indoor air can flow together, "220V AC Cooling Fan" so we can promote the rapid evaporation of sweat, combined with "evaporative need to absorb a lot of heat" so people will feel cool.