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In Switzerland it's just not allowed to install central AC with some exceptions AFAIK. But most people rent, so those window installed units aren't really an option either (can't just drill a huge hole for airflow next to a window). Many offices do that nowadays however, work impediment is just too big otherwise.

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Any reasoning behind central AC not being allowed? Just energy efficiency?

Until a couple of years ago it was IMO not necessary, especially for modern buildings with good isolation. Hot summer was maybe 2-3 weeks. But now I wouldn't say that anymore, but Paris agreement / trying to protect the climate as hard as possible is still more important than this. I do think however that we need to take measures to protect the oldest and youngest inhabitants.

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