One size fits none —
Since the Communists came to power, November 15 has been circled in red on many Beijing calendars. It’s not Mao Zedong’s birthday. November 15 is the day when city officials dutifully flick the switch to turn on the capital’s centrally-controlled heating system, supplying warmth to most of Beijing’s 22 million residents.
See, Chinese Freeze Before Gov’t Turns on the Heat – World Watch – CBS News.