alt Hacker NewsI'm actually surprised you were fine with single-hose. I've never seen a single-hose portable A/C unit that did an adequate job. AIUC, the laws of physics make that rather difficult. In fact I've sometimes seen them actively make things worse. Whereas I have seen dual-hose do an adequate job.
Also note, "survive" is a rather low bar. We're talking about encouraging some of the world's top researchers to move from the US across the ocean. I'm admittedly not in their shoes, but I imagine mere survival isn't their criterion.
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I had single-hose both when I lived in USA and now, and didn't have any issues with it cooling down the room I wanted to have cooled down. My bar is "survival of my pets" because rabbits supposedly can't handle more than 25C. Their room stayed well below that temperature both in USA (Seattle suburbs, west-facing in a house that wasn't insulated) and now in Portugal.
Ive seen a few single hose AC units that worked okay. I still don't understand why they exist though. The window installment at its minimum span is still putting the ends quite far apart and would increase efficiency.