"24V DC 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 the current through the "24V DC Cooling Fan" coil wire is resistance, it will inevitably produce an exothermic heat outward, so temperature It 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, so we can promote the rapid evaporation of sweat, combined with "evaporative need to absorb a lot of heat", "24V DC Cooling Fan" So people will feel cool.