Recommendations for minisplit? Climate Zone 6 report included
brandons
| Posted in Mechanicals on
This is a follow up on an earlier post. I have attached the engineer’s report I received along with plans. What I don’t know is what the ideal location for heads and zones on the mini split should be. Any recommendations?
The report shows a furnace but please disregard we are trying to use a mini split. We are also using an hrv for the ventilation.
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Report and plans
First off you have a serious air leakage problem! 3.93ACH@50pa is terrible! getting that down to an acceptable 1ACH@50pa knocks about 7500BTU/h off you load so a 3 ton multisplit will work.
I'll have to disagree with Jerry, ~4ACH/50 isn't really "terrible", especially if it's a retrofit situation. It's pretty crummy for new construction though, failing the IRC code requirement of 3 ACH/50 maximum. It's definitely worth working on, fixing what you can, but not worth tearing the house apart or gutting walls.
Thank you for catching that. I am disappointed in that number as I carefully detailed our air seal approach prior to the design. Zip sheathing for walls, roof, and "bonus" room floor. Poly ceiling barrier. We used the minimum operational windows necessary but they are casements. I'm confident we will be under 1 ACH50
Edit: These are based on the prints not an actual blower door test. For now we are trying to identify the equipment, placement, and if it necessitates any changes.
Thanks,