As summer temperatures finally settle in, many in the United States take it for granted that they can dial down the thermostat: Americans use 5 percent of all of their electricity cooling homes and buildings. In many other countries, however — including countries in much hotter climates — air conditioning is still a relative rarity. But as these countries boom in wealth and population, and extend electricity to more people even as the climate warms, the projections are clear: They are going to install mind-boggling amounts of air conditioning, not just for comfort but as a health necessity.
That’s already happened in some places. In just 15 years, urban areas of China went from just a few percentage points of air conditioning penetration to exceeding 100 percent — “i.e. more than one room air conditioner (AC) per urban household,” according to a recent report on the global AC boom by researchers at Lawrence Berkeley National Laboratory. And air conditioner sales are now increasing in India, Indonesia and Brazil by between 10 and 15 percent per year, the research noted. India, a nation of 1.25 billion people, had just 5 percent air conditioning penetration in the year 2011.
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