What the pattern can mean
Air movement at an outlet can indicate leakage through the electrical box, wall cavity or service penetrations. It can also reflect local convection that feels like a draft.
Why timing matters
Typical trigger: Wind, stack effect and HVAC operation.
Pressure differences move air through connected cavities and openings.
Evidence that increases the fit
- The sensation increases with wind
- It changes when exhaust fans run
- Other outlets on the same wall behave similarly
Evidence that weakens it
- No air movement is measurable
- The effect disappears when heating stops
- The wall is simply colder without airflow
Safe first checks
- Use tissue movement only outside the cover plate
- Compare fan-on and fan-off states
- Record wind direction
Important boundary
Do not remove energized covers or insert materials into electrical boxes.
Professional handoff: An electrician and air-sealing professional should coordinate any work at electrical boxes.
Primary references for this topic family
These references ground the general building-science or safety context. They do not diagnose a specific house, replace local requirements or certify a repair.
US Environmental Protection Agency · government guidanceMoisture Control Guidance for Building Design, Construction and MaintenanceMoisture sources, transport, design, construction and maintenance controls.Verified 2026-07-20 · review due 2027-01-20Open source ↗US Department of Energy · government research libraryBuilding America Publications and Solution CenterBuilding enclosure, HVAC, windows, indoor air and high-performance housing research.Verified 2026-07-20 · review due 2027-01-20Open source ↗
Observe→Compare triggers→Repair source→Verify outcome
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