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gburgwardt t1_j9q4elj wrote

Generally, anywhere cold air can get in (or hot air get out) is bad.

Easy temporary fix is to get some sort of adhesive plastic and put it over the whole window frame, like you're saran wrapping it. There's kits for this at home depot or lowes or whatever.

You can then also drape a curtain, blanket, etc over the window in order to help insulate

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TotallyNotAReaper t1_j9q7u4p wrote

This. I don't know if you can get it in Great Britain (guessing) but they make clear duct tape - if not, slap something similar over the crack and cover the window with a cheap blanket secured tightly with push pins around the frame.

Looks like a double pane, inert gas filled window, and if the outside isn't busted, in theory, shouldn't have lost that much R-value (insulation ability) - might be something else going on that it exposed.

(Edit: maybe not? Bad picture.)

Anyway, do the above and feel around for drafts coming through it or the surrounding trim.

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