I have begun insulating my attic and sealing air loss along my rim joist and behind baseboards in my 35 year old home. Before and after Energy audits with blower door tests show I have already reduced my air change rate from 6.5 to 3.5 per hour.
I have also blown in the attic to R50 and sealed the hatch.
My concern is that I still had planned to spray foam under my remaining baseboards on approx 1/3 of the upper and lower levels of the home as well as strip my stucco upper level to tar paper and re wrap and add R10 exterior insulation to the outside stucco portion, which makes up roughly 60 % of my exterior wall surface. In addition I still plan to insulate my basement walls and had planned to use foil faced foam.
I am wondering about how to retrofit an HRV system and how to reduce draft and insulate for up to -30 degree winter temps and +100 summer WITHOUT compromising the proper air flow in the house.