Aqondwa ukuze abe nesiphumo esikhulu sekuvula kwe-energi, amawindoyi wethu we-aluminum awatholakile ngokwesibonelo se-NFRC anemifanekiso yekuvula kwe-energi eyodwa ngokuphelele, ekutholeni kwezinye izinhlangano zokuzivulula ukuthi isiphumo sesithembiso sibe yisibonelo. Isakhiwo esikhulu se-aluminum esinamaphakathi esithembiso sisebenza ukunciphisa ukuthinteka kwesithembiso, futhi iglasini eliphezulu le-low-E elilwandle ngamagasi we-argon ilinda ukuthinteka kwesithembiso sesola nokuthinteka kwe-UV. Amakhubane amakhulu, amakhubane awathinteka ngamafutha, futhi amakhubane awasebenza ngokufanayo kwezinhloso zokuhle, lezi zinhlangano zincongofa ukuthi iziprojekthi ziyakwazi ukuthola izicelo zokutholakala kwezinhlangano zokubuyisa indawo yezinkundla zokubuyisa indawo yezinkundla, futhi zinikeza isiphumo esisodwa.