Why does an aluminum/wood triple-glazed window have condensation inside, despite the warm edge?

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Today in -15 C degrees I noticed that several windows have condensation on the inside in the lower corners, despite the low humidity inside 40%.

The windows are aluminum and wood with triple glazing with a warm edge. I am surprised that only 4 of the 20 windows are affected. Personally, I have also found that if you almost stick your finger in the corner, you can see cold air through the seal.

Is this a defect or is it inevitable and acceptable given the outdoor temperatures?

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Answers

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The window definitely remains the coldest part of the (modern) wall, doesn't it? If there's also high humidity in the room.

Even with triple glazing at a temperature difference of 35 C (-15 outside, +20 inside) physics cannot be outsmarted.

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If it's very cold outside, condensation can form. If the room is not heated in addition, the probability of condensation increases. The dew point shifts. 

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