Ah i see..... a customer of mine has a DeLonghi floorstanding unit in their server room after i recommended last year that they get air con in there as their server was cooking itself.

Went there last month when it was red hot outside and was sat in the server room with my coat on! made my nose run too

Did the job anyway

I think you have to take into account the size of the room you want to cool when looking for a unit, and the fact that if you want to do your entire flat you'll have to have all the internal doors open all the time. And all the windows shut too, or it'll be like driving your car around with the windows down and the air con turned on (pointless, as it tries to cool outside as well!)