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Controlled baseline walk-throughs: identifying draft corridors before lights out

Before initiating an overnight investigation, mapping the building's daytime thermal and acoustic baseline is essential. Loose window sashes, unsealed attic scuttles, and HVAC return ducts create predictable draft corridors that pull cold air across floorboards, closely mimicking the feeling of a sudden cold spot.

Walking the perimeter with an anemometer and recording air velocity while the building is still warm establishes a map of natural airflow patterns. When you detect a sudden drop in room temperature during a sweep, what steps do you take to verify air velocity and confirm the draft isn't being drawn from a chimney flue or foundation gap?