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Think about a limiting case. Suppose instead of leaving for a day, you leave for a year. (And you live someplace where it doesn't get cold in the winter.) Is it more efficient to leave your A/C on, or turn it off? Seems like the answer's obvious, no? So how about if you're only away 6 months? Or 3? One month, two weeks, etc. Same answer, no? So why would the answer change when you only leave for half a day?
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