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A lot of good suggestions were given, but in my case it ultimately was two things: Poor insulation - the energy audit found the insulation was about 8 to 10 inches too low for our area. Given the age of the house, it wasn't surprising that this needed to be rectified. Soffit vents - or lack thereof. I had no soffit vents to ventilate the attic properly. ...


Building Air Standard (BAS) is sometimes referred to as BAS - ACH This appears to be a (I begin to think deliberately, after quite a few vague web results) slippery number to track down, but it appears to be essentially an estimation of "natural air changes per hour" based on the blower door test. Simply calling it "Estimated ACH" would apparently be too ...

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