As the world gets hotter, scenes like these will become increasingly common. Buying an air conditioner is perhaps the most popular individual response to climate change, and air conditioners are almost uniquely power-hungry appliances: a small unit cooling a single room, on average, consumes more power than running four fridges, while a central unit cooling an average house uses more power than 15. “Last year in Beijing, during a heatwave, 50% of the power capacity was going to air conditioning,” says John Dulac, an analyst at the International Energy Agency (IEA). “These are ‘oh shit’ moments.” [...]
What fuelled the rise of the air conditioning was not a sudden explosion in consumer demand, but the influence of the industries behind the great postwar housing boom. Between 1946 and 1965, 31m new homes were constructed in the US, and for the people building those houses, air conditioning was a godsend. Architects and construction companies no longer had to worry much about differences in climate – they could sell the same style of home just as easily in New Mexico as in Delaware. The prevailing mentality was that just about any problems caused by hot climates, cheap building materials, shoddy design or poor city planning could be overcome, as the American Institute of Architects wrote in 1973, “by the brute application of more air conditioning”. As Cooper writes, “Architects, builders and bankers accepted air conditioning first, and consumers were faced with a fait accompli that they merely had to ratify.” [...]
As the rate and scale of building intensified, traditional architectural methods for mitigating hot temperatures were jettisoned. Leena Thomas, an Indian professor of architecture at the University of Technology in Sydney, told me that in Delhi in the early 1990s older forms of building design – which had dealt with heat through window screens, or facades and brise-soleils – were slowly displaced by American or European styles. “I would say that this international style has a lot to answer for,” she said. Just like the US in the 20th century, but on an even greater scale, homes and offices were increasingly being built in such a way that made air conditioning indispensable. “Developers were building without thinking,” says Rajan Rawal, a professor of architecture and city planning at Cept University in Ahmedabad. “The speed of construction that was required created pressure. So they simply built and relied on technology to fix it later.” [...]
One step towards solving the problem presented by air conditioning – and one that doesn’t require a complete overhaul of the modern city – would be to build a better air conditioner. There is plenty of room for improvement. The invention of air conditioning predates both the first aeroplane and the first public radio broadcast, and the underlying technology has not changed much since 1902. “Everything is still based on the vapour compression cycle; same as a refrigerator. It’s effectively the same process as a century ago,” says Colin Goodwin, the technical director of the Building Services Research and Information Association. “What has happened is we’ve expanded the affordability of the air conditioner, but as far as efficiency, they’ve improved but they haven’t leaped.” [...]
Researchers have also shown that people who live in hotter areas, even for a very short time, are comfortable at higher indoor temperatures. They contend that, whether it is a state of mind or a biological adjustment, human comfort is adaptive, not objective. This is something that seems obvious to many people who live with these temperatures. At a recent conference on air conditioning that I attended in London, an Indian delegate chided the crowd: “If I can work and function at 30C, you could too – believe you me.”
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