[Features] ●Vaporization heat of water is used to convert hot outside air into cool air and supply a large amount of air. ● You can feel the coolness with the large air volume. ●Excellent cost performance. Since it cools the air with the power of nature, the electricity bill is overwhelmingly cheaper than an air conditioner with the same cooling capacity. ● Creates an environment where insects, dust, and hot outside air are less likely to enter with a large amount of air supply (positive pressure).