A typical 2.5 ton home AC unit for a 3,000 square foot house costs $391 a month to run, but will cost 3-4% more than that for every degree the thermatstat is set lower than 78 degrees. So if that house has it's temperature set at 72 degrees, for example, the owners would spend nearly $80 more a month instead--that's nearly 20% more expense per month. Given that the State Department building is over 1.5 million square ...more »
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