Air leaks and wind-driven pressure differences move garage air even when the big door stays shut. Gaps around the door, soffit vents, and poorly sealed service entries let outdoor air slip in along the floor and behind stored shelving.
Wind versus door events
Door openings produce sharp, short spikes tied to human activity. Steady wind on a cold night creates a slower drift—especially on probes near the door bottom or exterior wall. Compare with garage door swings to tell which driver dominates.
What to watch in data
- Overnight plateaus colder than forecast often mean chronic infiltration.
- Humidity rises when warm moist outdoor air replaces dry winter indoor air.
- Zone mismatch between door and interior probes flags draft paths.
Next steps
Use historical data to correlate windy weeks with minimum temps. Freeze planning belongs in freeze protection thresholds once you know your typical leak-driven floor.