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In northern climates Argon is a better insulating selection as compared to air. As Peter has said it is critical the gas between the panes be dry - and remain dry. When the seals fail, humidity from the ambient air gets between the panes and condensate will appear between the panes of glass.

I would opt for Argon because a very easy way for a window company to cut costs is use compressed air. (While I did not invent cynicism, I am working on perfecting it.)
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