Do these structures have windows? If so, you can hang window units on them, or at the very least have floor units and vent out the window.
AC does not necessarily mean Central AC systems....geez.
I'm sure you're the first person to comment on ugly buildings with window units hanging out of every available space. Oh wait, I've actually seen you make exactly this comment before you hypocrite.
And that's before you consider that many European window designs do not lend themselves to having window units bolted into them (since many countries do not actually have sliding windows as a standard).
And floor units? I mean can't you come up with an even worse solution? Why not put a large block of ice in the house, or just leave the fridge door open. Floor units are woefully inefficient, woefully loud, piss weak, and take up valuable living space. They aren't just a last choice for most people, they are a non-choice for most sane people. You can achieve more with a ceiling fan and an awning.