[nemomarx]

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.

[lrae]

Sash windows are just not as common. Seems like they are in the UK somewhat, though numbers I found vary, but overall in Europe they're pretty uncommon.

And yes, there are options for tubes/ducts for the more common window types. Like tilt-and-turn windows, horizontally sliding or all the other kinds of inward or outward opening windows - but most of them are the ducted portable units the original comment was speaking of, which aren't great. There are also some better portable split units, but those are pricier and the install is not as easy. (They're great though.)

[mc32]

one issue with tilt and turn is getting window screens for them. It's possible but mostly they get installed on the inside if you have the proper wall spacing that allows window to function without interfering with the screen. mini splits are great but it's much more money than a simple window unit or portable unit.

[ajmurmann]

Living in the US I honestly miss the German windows that swing open. You can open the entire window whereas sliding windows can only ever open halfway.

I also sometimes miss being able to stick my head out the window but that's a tradeoff about screens and in the end of the day I prefer not to have to worry about bugs.