What about portable units? They're pretty popular here in NL, but I suppose people are also rapidly installing mini-splits, at least here in the south.
Portable units in general are just bad. Not very efficient, noisy and not that performant. And sadly it seems most only have single pipe, not two that would fix lot of issues.
They are just terribly inefficient. Now a lot are sold here, but it's just not a feasible solution to make living in summer more tolerable. A mini split or even better centralised AC for the entire building is much more efficient