• Not heard of them, but their published Uw values are very high (not good), meaning the actual values will be even worse. Also, the seals on sliding/bifold type doors are generally poor compared to the compression seals found on French/casement doors, meaning poor airtightness that only gets worse over time as the seals wear.

    Whether the above matters to you is another thing entirely; sometimes initial cost trumps comfort/ongoing savings...

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