alt Hacker NewsProbably because the UK - similar to most of Europe - does not use the US vertically sliding sash window type, does it? The typical "walmart window AC" does just not really exist in (most of) Europe, because the windows for it don't exist, afaik.
Edit: Turns out, sash windows are more commonly found in the UK (compared to other European countries), but still not as common as in the US. So, UK = not as hot (so far), thus still probably not worth it (yet) as a market.
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Why are the windows different, actually? They don't seem to be smaller overall, just skinnier and taller?
But you should still be able to get two tubes fitted into any kind of window with the right seals. If you were really up for renovations you could get closeable exhaust holes punched through your brick or something maybe.
I have a skinny tall window unit. It is called a casement unit. Pretty small market though at least in the US, only a few makes and models in comparison to the plethora of traditionally sized window units.