

This isn’t actually necessarily true if you just need specific cooling.
If for instance, you just care about cooling your bedroom for sleeping, then it can be more efficient to install a window unit in just that room and let the rest of your house be warmer. A mini-split would be more efficient than a window unit for that role, but they’re also a lot more expensive and permanent.
While the dual hose ones are better, I agree that these all kind of suck because you have the compressor inside and it’s always the loudest part of an AC.