According to Manta.com there are 442 window manufacturers in the United States. Of those 442 Window Manufacturers there are 40 that meet the EPA’s and NFRC’s highest standards that award the Energy Star 2019 logo (some recognizable names are Marvin, Pella & Anderson)
Our window, Okna, has the lowest U-Value (the lower the value the more energy efficient) & Performance Grade (the higher PG, the better performance against wind, water & air) out of the 40 Energy Star Rated Windows.
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