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mitsubishi mini split branch box required or not
I am working with few vendors and want the mini splits to be installed as primary heat option. I would have back up electric heat baseboard but planning to use mini splits in Massachusetts as primary heat for now.
my home have 3 bedrooms upstairs and 1 living room downstairs. and system i want to work is like below:
Living room is on first floor, master bed room is directly above it and then 2 small bedrooms are 40 feet from master bedroom which could be connected via unfinished attic.
We got quotes to install following:
2, Mitsubishi, M- MSZFH06NA, 6,000 BTU, wall-mount air handler
2, Mitsubishi, M-MSZFH12NA, 12,000 BTU, wall-mount air handler
1, Mitsubishi, M-MXZ4C36NAHZ-U1, 36,000 BTU, multi-zone heat pump condensing unit
Now here is the difference 2 contractors say we need to have mitsubishi pac-mka50bc branch box for 4 head installed and 2 are saying we dont.
I called mitsubishi and they said with the model MXZ4C36NAHZ i must have that but you could get away with it. So it was more confusing.
I want to know is do i really need branch box or i can get away with it? as difference in quotes is $$$$ difference.
Thank you all in advance for your help.