Might mean (unverified): Highly efficient, advanced thermal insulation.
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We found 2 dictionaries that define the word superwindow:

General (1 matching dictionary)
  1. superwindow: Wiktionary

Tech (1 matching dictionary)
  1. Efficient Windows (No longer online)

Definitions from Wiktionary (superwindow)

noun:  A highly insulated window incorporating multiple insulation techniques.

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