At a construction site in South Dakota, architect Steve and energy expert Randy Williams conduct a precision air-sealing assessment on a new high-performance home. Using a specialized pressure test, they determine the structure has an impressive 0.18 air changes per hour—three times tighter than passive house standards. Despite lacking installed windows, the early test showcases the airtightness of the sheathing and roof assembly. Steve compares the total air leakage to the size of a business card across the entire envelope. The team praises the builder’s detailed craftsmanship and emphasizes the importance of data-backed decisions in energy-efficient construction.