Ari [APz] Sovijärvi on Nostr: Look at the picture at closer detail. That model is installed onto a sliding window ...

Look at the picture at closer detail.

That model is installed onto a sliding window that just slides sideways.

Hacking one onto a partially opening window can be done, but it's often painfully awkward design, involving putting a huge box over the whole partially opening window or in some cases taking the whole window out.

Old buildings in places where warm weather just wasn't a thing in the 70s will have these fun design choices. We can easily take -35°C but +25°C is painful.