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.
Markus29
joined 2 years ago
Yeah I miss some of these folk
I did that once and the before/after dopamine is nice. But the downside is that looking back at the after photo and realising that it looks like shit again after 10 weeks is even more depressing. 
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