For the same reason they have the heat on and windows open in the winter. I was told Mao said that Chinese need fresh air. Yeah, but not that much. i tried to tell my girl friend that rooms are not air tight, see that gap around the window and the gap under the door?

I told he one night and asked , do you want the window open or AC on, AC on. Woke up in the morning with 2'' of water on my floor from the AC and the balcony door wide open.

What does it take to make them understand rational thought?

they do this crap on the buses in jinan when it is 40 c outside and the bus is running ac at full blast. peasant attitude

once in the winter at minus 10 , the crazy guy open the window and told me it was for fresh air, i politely informed him that jinan is 8th dirtiest city in the world for pollution and coal is being burned everywhere since this is january and then said where do you hope to get any "fresh air", no concept of what i said. another peasant attitude.