I don't know if it's what the OP meant but the standard "German window" is a shape that makes an AC a lot more difficult than in e.g. the US. You can't mount it

I don't know if it's what the OP meant but the standard "German window" is a shape that makes an AC a lot more difficult than in e.g. the US. You can't mount it in the window directly and the insulation required is relatively irregular. https://deine-mobile-klimaanlage.de/abluftschlauch/ https://deine-mobile-klimaanlage.de/abluftschlauch/ Anecdotally, doors within an apartment/house are also far less airtight than in the US. (Germans take airflow in homes extremely seriously; es zieht / frische Luft! is perhaps the fundamental contradiction in the German culture.)