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a vacuum would indeed insulate better. I would assume they don't use it for practical reasons. Glass widows have very large areas so the glass would have to be very thick/strong support the loads. Imagine a 3x6 ft window with a near full vacuum would have to support 18 Tons of force whitin the glass.
I imagine argon is used because it is inert, relatively light, and cheap. Lighter should be better, but easier for the molecules to escape
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