I'm a enthusiast of mini-splits, but When you've got five very little rooms upstairs, and they want to do split heads or quite a few units, I do not get it. Just have a central system. They make central devices with inverter compressors (to match the eff of minis). https://housessoldgawlersouth00998.full-design.com/considerations-to-know-about-house-sale-gawler-south-78238060