If you can install a permanent unit, that would be preferable in the long term because they are much
more efficient than the portable floor units.
Unfortunately, I live in an apartment that has (crappy) central air, and only the portable type is permitted. I didn't even need it last summer.
When I was shopping for one last spring, I did notice that the demand was high and that several models sold out in April already.
It might be a reasonably cool summer though. so far it's been much colder than last year.
Over here, people believe that colder winters get followed by hotter summers ...
I dunno if that has any substance or is just a belief.