I have double-glazed uPVC windows. Where the windows close, there is a draft in some cases (as if the window is not closing 100% tight against the frame).
Is there any way of sealing these imperfections up? (e.g. can you adjust the closing mechanism of the window? can you buy a draft-excluder strip of rubber?)
I had the same problem with one of my double glazed windows. It didn`t close completely against the hinged side of the frame. I made metal clips and put them onto the fixed hinge mechanism on the frame....really hard to describe without a photo..I will try to upload a photo if you are still having trouble.
If you are any way mechanically minded and have a look at how the mechanism works it`s fairly obvious how to remedy the problem.
In the meantime you can just stick on some sticky foam insulation tape until the weather gets a bit better.