Manual J – Calcs – Mini Splits
Zone 4B – 3,300 sqft – 2 story – R10/R25/R60 with R8 windows – open floor plan design
The calcs came in at 3.25 tons heating/cooling. Two ductless minis per floor:
3 – 9,000 Btu Mitsubishi Hyper Heat Pumps – 26 SEER – 10.5 HSPF
1 – 12,000 Btu Mitsubishi Hyper Heat Pump – 26 SEER 10.5 HSPF
$12,000 installed (P&L) for all units – 10 year warranty
I know I can get by with probably 2 Minis (one per floor) but the calcs do NOT include the passive solar heat gain through the south glazing during winter. Plus the county would throw a fit if I don’t have a heating unit in each room as required per their code.
Overall I am relatively pleased and I know they are “over-sizing” the requirements but that’s the requirement by code. If not for the minis I would have to install resistant wall heating units in the rooms (600 watt) to pass code.