OKNA windows are meticulously crafted with the latest advances in technology for unmatched quality, efficiency, clarity and durability.
ENERGY STAR is a joint program of the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Energy helping us all save.
The National Fenestration Rating Council (NFRC) provides unbiased energy performance ratings of windows, doors, and skylights.
Enhanced by multiple layers of advanced glass coating, OKNA windows provide optimal climate control, neutral aesthetics and plenty of natural light.
OKNA Windows' superior efficiency makes you feel more comfortable while using less energy and producing less carbon dioxide pollution.
OKNA windows outperform most others in thermal transmission as well as air and water infiltration and structural integrity during severe weather.