Trickle vents *cause* condensation ?

10 Jun 2013
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United Kingdom
I had all my drafty single-glazed sash windows replaced with new double glazed windows /frames a year ago. Since then, the one remaining single-glazed thing (a door) mists up in the winter. I don't want to go through the hell of removing the frame, so I am planning to just replace the door glass with a sealed double glazed unit and add a trickle vent to the top of the door.

So far, so good.

But someone recently suggested that having drafts (either natural ones around the edges of the door, or man-made ones from a trickle vent) would cool the inner pane of glass and tend to CAUSE condensation.

You usually think of trickle vents reducing condensation, but is it possible that they would cause it? Would I be better off (condensation-wise) without a trickle vent ?

thoughts ?
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