New construction: ductless minisplits
Was hoping to get some input from the forum (which will hopefully include Dana) in regards to a new construction project I will be starting this year in Midcoast Maine, climate 6. I have attached a few shots of the floor plans (ignore 28×40′ dimension on 2nd floor… both floors are now 28×36′). 9′ ceilings at 1st and 8′ at second. Goal is a pretty good house with 12″ double wall blown in cellulose R40 and ceiling blown in cellulose R60, and insulated foundation. Windows will be PVC triple glazed tilt and turns.
A local HVAC outfit quoted me the following pumps for the project (along with their location):
Mitsubishi Electric MXZ-4C36NAHZ inverter driven heat pump outdoor unit
-Mitsubishi Electric MSZ-EF12NAW wall mount indoor unit in the living room.
– Mitsubishi Electric MSZ-EF09NAW wall mount indoor unit in the entry.
-Mitsubishi Electric MSZ-GL06NA wall mount indoor unit in the master bedroom.
Mitsubishi Electric MSZ-GL06NA wall mount indoor unit in bedroom two 2nd floor
My question is am I wrong in assuming this may be more pumps/overall heat than I really need? Prior to receiving the quote I spoke with many people also involved in the industry and I envisioned I would have 1 larger unit downstairs in living area and another in the upstairs hallway or Master bedroom. I also figured both of these would have their own outdoor pump as well rather than the 4 heads on 1 outdoor pump that I was quoted.
In the closed off bedrooms if needed, I just planned to use electric wall panels such as the convect-air units and in bathrooms radiant webbing underneath tile. I am quite new to the game of ductless heat pumps but have tried my best to educate myself on the site and also with Martins book which has been awesome. But I would love any thoughts/experience/opinions from anyone on GBA.