"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 current through fan coil wire is resistance, it will inevitably produce an exothermic heat outward, so the temperature will rise. But why people will feel cool it? "24V DC Cooling Fan" because the body's surface there is a lot of sweat, When the 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" so people will feel cool. The main component is a fan: "24V DC Cooling Fan" AC motor. Its working principle is: energized coil in a magnetic field by the force of the rotation. Form of energy is transformed: the main electrical energy into mechanical energy, and because the coil has a resistance, so that there is an inevitable part of the electrical energy to be converted into heat.