I am a fan of mini-splits, but If you have 5 small rooms upstairs, and they wish to do split heads or quite a few units, I do not get it. Just receive a central technique. They make central devices with inverter compressors (to match the eff of minis). https://keeganhqzip.bloggerchest.com/35790637/houses-sold-gawler-south-no-further-a-mystery