after my energy audit and some changes went from 5.65 ACH to 4.09 ACH
1964 bungalow got new windows and doors, we did not switch 5 small windows. We have two new vinyl in basement with one being crap does not seal but when we bought thought nice newer windows and left 2x more in basement that are original in older part of basement and left one bathroom window in ensuite as it opens into garage.. weird setup.
but thought that was a pretty good improvement, we since had got a gas insert for our wood burning fireplace so hopefully has helped even further. Now we need to fix insulation in our vaulted ceiling living room.
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