hmmm

Using a portable -one hose- AC give me about 5 degrees delta in half my small house during the EU heatwave, in my case improving on passive cooling by multiples, so your last sentence just sound like ' I've never felt the effects of portable AC' to me. probably pretty common in the US, but EU houses often dont come with AC preinstalled.

I get that it's a dumb system, and I even knew before I bought this one hose monstrosity, but it's what is available to us here right now, and the fact that a split ac or window ac or 2 hose airco system (there was 1 model available to me locally, and it was sold out) is way more efficient doesn't magically make the one hose version work bad. It still uses the compression cycle for refrigeration, which is very powerful even when used inefficiently.