Energy conservation: With the trend of global warming and environmental protection and energy conservation, the use of air conditioners, a high power consumption household appliance, is increasingly restricted. One air conditioner is equivalent to the power consumption of 20 ceiling fans. When the temperature is not more than 30 degrees, the use of fans can completely achieve the effect of cooling and heat removal. Of all fans (table fans, floor fans, ceiling fans, etc.), only ceiling fans produce the largest air volume under the same power, (The air volume is the product of wind speed and area, which is equivalent to the flow of water), so the United States recommends the use of ceiling fans as energy-saving appliances. It is also found that the use of ceiling fans in conjunction with air conditioners can reduce the load of air conditioners, and also make indoor temperature difference not easy to make people catch a cold, and the comfort is quite good.