Interesting. So one personal observation on Wirecutter (which caused me to stop trusting it).
It does reviews of portable air conditioners. A couple of years ago, it went into painstaking detail on how single hose AC is bad. They linked articles from the Department of Energy and so on. Their message was that single hose were easy to install but were absolutely not worth it. And recommended a dual hose system
I happen to agree with that. Portable AC units are already incredibly inefficient, so you don't want to make it any more inefficient than it has to be. I bought their recommendation, it was actually a decent one.
Next year, the completely backtracked. Not because new research came to light that contradicts the previous one. Not because new models came out that massively improved the losses (not even sure that's possible). No. Now they say that the difference is "minimal". It is not minimal, and their previous argument is that it wasn't minimal and they should only be used when there was no other option. They did not provide updated efficiency figures.
Here's the new text:
> While dual-hose models have been shown to outperform some single-hose units in extremely hot or muggy weather, the difference is usually minimal, and we don’t think it outweighs the convenience of a single hose.
Sure, one can reverse their position and that can be a healthy thing to do. But to take major pains in arguing one position one year, just to reverse the position and provide no new data, it's very fishy.
And, of course, the recommended models tend to be pricey too.