I'm a fan of mini-splits, but When you've got 5 tiny rooms upstairs, and they want to do split heads or quite a few models, I don't get it. Just get a central procedure. They make central devices with inverter compressors (to match the eff of minis). I used https://felixsguhs.blogscribble.com/35963964/a-secret-weapon-for-gawler-sa-houses-for-sale