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Infrared shows a cold patch, but is it actually a draft?
A cold-looking area on a thermal camera doesn’t necessarily mean outside air is leaking in. How do you use infrared imaging and a smoke pencil together when wind, the indoor-outdoor temperature difference, or room pressure could change what each one shows?
The smoke pencil seems more direct for spotting air movement, while the camera can point out temperature patterns worth investigating. If they suggest different locations, what follow-up observation helps confirm an actionable air leak without treating the image alone as proof?
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A repeatable smoke-pencil response is more useful than a cold patch by itself. If the plume bends toward the same gap on repeat checks under similar room-pressure conditions, that supports air moving through that spot. If it doesn’t, the camera image alone can’t confirm a draft.