I wonder what the performance difference is between the windows you and I are talking about. It's probably more cost effective to simply reduce the total amount of glazing in favor of insulation and go with the cheaper window. I can't imagine spending $600 on a single window. For my proposed construction that would be over $13,000 in windows alone as opposed to $4,500. It would probably take me decades to break even. The difference is almost the total cost of installing insulation.
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