As one of the leading OKNA Window installers in Buffalo NY, Wonder Windows takes pride in offering the complete OKNA line at the most competitive prices, backed by the assurance of over fifty years of professional sales and installation experience.

OKNA Precision Weld Windows

With their clean lines, modern style and superior craftsmanship, OKNA Precision Weld replacement windows are an ideal solution for homeowners concerned with quality and energy-efficiency.

  • One of OKNA's most affordable residential windows
  • Custom made for a precise fit and easy operation
  • Available in double-hung, sliding, picture and hopper styles
  • Durable vinyl frames with Heatseal® spacer technology systems

OKNA Insul-Tec Replacement Windows  

Insul-Tec windows are a favorite among homeowners throughout Buffalo, based on their strong design, advanced features and extensive selection of styles.  Whether purchased as a replacement window or for new construction, they're sure to provide years of energy efficient use.

  • Fusion-welded sash and frames for exceptional durability
  • Dual weather stripping with Heatseal® spacing for increased thermal efficiency
  • Comes standard with half-mesh fiberglass screens
  • Specifically engineered to prevent air, dust and condensation

OKNA 700 Series Casement Windows

Effortless cranking and a clean, modern design makes the 700 series an excellent choice for homeowners who enjoy the comfort and functionality of high quality casement windows.  They represent the perfect combination of beauty, elegance and performance.

  • Can be hinged on either side to accommodate your needs
  • Features triple weather-stripping to reduce noise, drafts and dust
  • Premium handles allow for easy opening and closing
  • Bevel welded frame & sash provide long-lasting durability

OKNA 750 Series Awning Windows

Marked by their distinctive top-mounted hinge design, the OKNA 750 Awning Window Series is a perfect selection for those who prefer optimal circulation, backed by the performance and features OKNA is known for.

  • Top-mounted hinges crank outward in a smooth, easy motion
  • Beveled frame and sash featuring durable welded design
  • Protected by air-tight triple weather stripping
  • Comes standard with corrosion-resisting hardware & handles

OKNA Enviro-Star Windows

As OKNA's top-of-the line replacement window, the Enviro-Star series is meticulously designed to address the needs of the most discerning homeowner.  With an appearance that mirrors the look of real wood and the company’s highest energy-efficiency rating, they represent everything the OKNA name stands for. 

  • 3 1/4" deep-welded frame with Heatseal® warm spacer edge system
  • Maintenance-free vinyl profile with multi-chambered sash design
  • Fully-integrated locking system with dual weather stripping
  • Available with a wide range of hardware and handles