Minisplit placement/zoning relative to loft with vaulted ceiling?
Based on several GBA articles there is an efficiency cost to having a ‘multi split’ where two head units connect to the same outdoor unit. But in this case the two head units aren’t really in a separate zone in the traditional sense. However, there will be times of the year where one is functioning much more than the other, and if set up as multi-split there would be refrigerant needlessly running to the other unit. Therefore my guess is it would be best to have them each run to separate outdoor units? But then how would you size them? Downstairs with a 18K BTU/hr indoor/outdoor 1st floor, and 9kBTU/hr indoor/outdoor upstairs?