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Energy Efficiency

Air conditioner use will triple by 2050. That's bad news for a warming planet.

During sweltering New York City summers, the native energy application warns that for each level you decrease the thermostat, your calories invoice is going up by 6 p.c.  Air conditioners in each shape — from window gadgets to central air — gulp calories. There are some 1.6 billion A.C. gadgets …

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