Maybe monumental buildings might have some regulatory concern but where I live it's not an issue. My neighbours in the same flat have 2 big condensers (the outside box of a split AC box) on their balcony. I just don't want to invest in it myself so I have only one of those stupid porta units, not great but it does the job when I need to cool down a bit. And our building is monumental from the 1800s. Also, every single hotel and commercial place has it.

But really in the netherlands which this article is about it should not be a barrier. The weather there in summer is extremely variable. Yes you get some hot days but they are few. And like I said, if you really want AC you are free to pick a place that has it. If you're a skilled migrant you will be well compensated anyway. You will have your pick. Viewing that as a barrier is just blowing things out of proportion.

The same way that American media is these days talking about Europe like it's overrun with migrants, it's just political.