During a blower door test, a fan installed in the front door pulls air out of the house, creating a slight vacuum. The amount of air that flows through the fan is measured in cubic feet per minute, and is compared to a mathematical model of the house to determine Read more »
My attic is insulated with fiberglass batts. Thank you, insulation contractor! Wait, what happens when I look under this batt of insulation? Oh, I have no effective insulation. I want my money back! Lesson to insulation contractors: Align the pressure and thermal boundary. In english, this means make sure Read more »