I’ve built a SIP Panel house, 6″ R24 walls and 10″ R40 roof, Low E windows .31 on the sliders and .29 on the standard 3×5 windows. Floors will be packed with cellulose between my to be finished basement at a later date. I’m currently
My plan calls for a minisplit in both upstairs bedrooms (I want a single unit that could be ducted into both with a short run of 6′ either direction but I’ve not seen on that will do that) 1 for the Master bedroom on 1st floor, one in the kitchen that would service both the kitchen and living room since it’s all an open area. I’d get (2) 3 port Mitsubishi M’s that would allow for me to add one to the basement at some point.
I will be installing a ERV that is capable of 50-140cfm and it will be ducted to the 2 bathrooms and 1 kitchen for the intake and will exhaust to the 3 bedrooms.
The problem I’m running into is that even with 9k units I’m going to have way more cooling/heating than I need. We will be heating and cooling solely with these units in zone 4, I’ll have a 20k BTU propane wall fireplace as well eventually but not right away. I have a wood fire forced air furnace from charmaster that I was going to install but I realized it would be incredible overkill at between 80,000-100,000 BTU’s depending on the wood that I would be using so I’ll be selling that on craigslist sadly.
I did the following Manual J:
Idea’s? Am I just going about this the wrong way? In polling the HVAC people in my area I don’t really trust any of them with SIPS calculations nor Minisplits as the only ones that are used are the tack it on the side of the house with a 1ton unit ‘remodels’. There aren’t any SIP houses in my area that I’m aware of. I’ll be installing them myself and having a local ‘charge’ them.
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