That is old advice. AC works pretty fast, especially in a small hotel room. If you have floor heating/cooling and a heat pump then it would make sense to leave it on all day.
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Cake day: July 3rd, 2023
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Yeah I miss some of these folk
Yes I know, I meant air/water heat pumps which heat/cool the mass of a building instead of the air. AC units are oversized more often than not and are not that efficient at modulating. I think it’s safe to say that it’s more efficient to turn it of when you leave for more than an hour or two