Ducted Split — 4 zones
I’m real close to making a decision but, as always, the more I learn the more questions I have.
The zone 6 house has 3 floors, 1540 sq-ft per floor.
The HVAC contractor proposes an LG Red 36KBTU (LUU360HHV) for the 1st floor, AHU (LVN361HV4) and ductwork in the basement with floor registers to the 1st floor. And, an ERV tied into this ductwork.
He proposed an LG Red 24KBTU (LUU240HHV) feeding 2 AHU’s (LDN127HV4 & LDN187HV4) for the 2nd floor (one for front half of floor, one for rear half).
And an LG Red 18KBTU (LUU180HHV) for the 3rd floor with an AHU (LDN187HV4).
Then I started to figure out the proposed return solution. If I’m understanding this correctly, each floor’s system will be disconnect from each other floor’s system (i.e., operating completely independently).
The first floor will have the ERV for fresh air exchange.
The 2nd and 3rd floors don’t seem to have any means to get fresh air.
Am I over-thinking this?
Then there’s the question of an HRV or ERV. The way we changed from HRV to ERV is I mentioned that heat in the Winter can really dry out the air inside the house. He said that an ERV will take some of the outdoor humidity and let it in (yes, Winter humidity is lower, but the thinking is that it will be substantially higher than inside a tight, heated house — yes?).
Would very much appreciate thoughts on this.
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