Sizing exhaust only ventilation?
I am roughing in plumbing and electric and need to add ducts if we choose to use an HRV which is what I had originally planned. The house we are building has radiant floor heat in the basement and an outside air supplied sealed fireplace on the first floor so no ducts yet. Some other costs have exceeded estimates and I am thinking of using an exhaust only system to ventilate the house (Northern Michigan approx. 8000 HDD, R-40 walls, R-60 roof, hopefully fairly tight, about 2400 sf). My wife’s response to this was “so we spend all this time and money building a tight, insulated house and you want to poke holes in the wall to let in cold air?”
So my question is, how much make up air does one need, what’s the best way to let it in and how much does this effect the heating load? Or, if I do end up with the HRV, is it possible for me to install it and have any chance it will perform correctly?
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