inkseep1 t1_j9qco8p wrote
That window looks like a vinyl window. Somewhere on it will be sticker that shows the maker, serial number, and the size. You find that and order a new replacement sash and put it in. I can't tell from the picture what version of window you have. It might be under warranty and you get a free sash due to 'seal failure'. Depends on who made it.
It is very unlikely that the little crack on the inner glass of a double pane window is going to cause much cold air to leak in. It is more likely coming from around the window due to poor insulation when it was put in. Can't tell because the picture does not show the entire installation.
j-random t1_j9r31ac wrote
Vinyl windows are often cheap replacements people use when they replace old single-pane windows, and there are often uninsulated gaps around the frame. Try some gaffer's tape around the entire window frame to try to seal it.
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