With the trend of global warming and environmental protection and energy conservation, the use of air conditioners, which are high power consuming appliances, 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, using fans can completely achieve the effect of cooling and heat removal. Among all fans, only ceiling fans produce the largest air volume at the same power, so ceiling fans are recommended in the United States.