Since when is there air conditioning?

British inventor: Willis haviland Carrier,/kloc-0 invented the air conditioner in July, 902,/kloc-0 exported the first air conditioner in July, 907. The buyer is a Japanese silk factory. 1988, the first domestic split wall hanging machine KF- 19G 1A was born in Huabao Air Conditioning Factory. How to use the air conditioner: the first trick: don't blindly covet the low temperature of the air conditioner, just set the air conditioner temperature appropriately, because if the set temperature of the air conditioner is increased by 2℃, it can save electricity by 20%. The second measure: choose an air conditioner with moderate cooling power. The third measure: close the doors and windows when turning on the air conditioner.