AIRCON is expensive
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"Excessive air conditioning places a costly burden on the city. Besides the environmental expense, there’s a very real dollar cost when the power bill arrives each month.
“Air conditioning, particularly in the summer, accounts for about 60 percent of the cost of energy used,” Christine Loh, the founder of the think tank Civic Exchange, says. “Obviously that is a big chunk, and you can translate that into money.”
Residential users tend to turn up the air conditioning at night, when they’re back from work. So they are cooling their properties at the coolest part of the day. But stores and offices need to crank up the system when the sun is at its strongest.
Still, one study in 2005, put together by the Hong Kong Polytechnic University, shows that Hong Kong office buildings are the coldest in the world, with an average temperature of 21 to 22?C."
/more:
http://www.squarefoot.com.hk/green-living/cost-air-condition