We are in the process of what’s essentially a new build of our home in CZ 3C. Total square footage is ~2400, single story. We’ve hired an engineer to run the manual J calcs and attached is a room by room summary (heat load in red, cooling load in blue) combined with the floor plan. I think the loads might be a little high given our mild climate and this being essentially a new build, but let’s put that aside for the moment.

In an ideal scenario, we’d have 4 zones (illustrated in attachment) all running on some combination of minisplits (ducted and/or ductless). From what I’ve gathered on this site, it seems like the bedroom zones (1-3) may be too small to be on their own zone? The reason for bedroom 3 being its own zone is that it will be a “mixed use” room for guests (shut off when no occupied) and indoor exercise activities (intermittent boost cooling). Also, while the master bath has electric floor heat in the plans, I still included it in zone 1 because there will likely be no door to partition the space. Any suggestions on how we might best be able to make this work? Thanks in advance.