The last house I restored I used 3 ducted mini splits and one cassette unit that went in the ceiling so no obtrusive units on the wall anywhere. The cassette unit was in the front upstairs bedroom that got blasted by the sun and all units had its own thermostat. The cassette units are great, but can be expensive if you need a lot of them though.The attic was insulated at the roof with spray foam so a condition space as well