Choosing an HVAC System for a Large House
We are building a 5 bedroom 4.5 bath 3,400 sq ft house in the Bend, OR area. If you aren’t familiar with the area, there will be a few days down to 0-5 degrees F, and several in the summer in the 100-105 degree F range.
The home is two stories, with a large 21′ cathedral great room. We’ll be using solar to offset much of the electricity usage, and we are having the house sealed with the Aero Barrier spray down to passive house standards <0.6 ACH and putting a layer of ProClima between the ceiling at unconditioned attic to seal the envelope.
My question is would a ducted min split, ductless mini split, or traditional heat pump with ducts be the best approach? Maybe some combination?
Our HVAC contractor seems wary of ductless, and I believe prefers a traditional ducted heat pump, though he may not have known we were going for passive house tightness when he recommended that. I don’t have the manual J calculations yet. Also, what questions should I be asking our contractor, and are there any brands most recommended?
Attached are the blue prints without all the detail. The bottom floor is about 2,200 sq ft and the top floor is 1,300 sq ft.
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