86 year old house, 2 story 2300 sq ft and a unfinished basement. 1st story 1400 sq ft walls with new insulation, 2nd story 900 sq ft, walls need updated insulation. .85 climate zone, a/c not needed (Oregon location with house in perpetual shade) Winters mostly above freezing.
oil furnace with original metal ducting (non-insulated) in basement (Have not used for two years), woodstove on 1st floor, Primary heat for last 2 years. Portable electric heaters used one bedroom upstairs, master bedroom, bathroom and kitchen downstairs.
6 cords a year too much to keep up with, I want to add either a packaged Heat pump that connects to my existing ductwork, or ductless Heat pump.
Our house layout downstairs is a 8 foot long centrally located hallway that all rooms connect to (260 sq ft Den, 250 sq ft l/r, 225 sq ft m/b and 325 sq ft kitchen), with doors on each room access point.
Which system would be more efficient, ducted or unducted? My thoughts are:
Could put a ceiling minisplit with one register in the hallway that would feed to each of the rooms? Might not distribute air well enough to each room?Have a separate mini for upstairs.
Minisplit 4 way for downstairs, 3 way upstairs, would work but expensive
Ducted, packaged Heat pump that connects to central system, less expensive, less efficient?, less control for zone heating could shut off vents in rooms not used.
Any suggestions greatly appreciated.