OKNA uPVC Double-Hung Windows for New Construction & Replacement – CT & MA
OKNA uPVC double-hung windows deliver classic style, modern performance, and easy function—ideal for both new construction and replacement window applications. With durable framing, tilt-in sashes, and an integrated nailing flange, these windows are a reliable choice for homeowners, DIY clients, builders, contractors, developers, and architects throughout Connecticut and Western Massachusetts.
Contact SEVEN SUN today for your FAST Free Quote — and experience top-tier performance with long-lasting value.
Classic Design with Functional Tilt-In Sashes
These windows offer smooth, vertical operation and allow both upper and lower sashes to tilt inward, making them incredibly convenient for everyday ventilation and hassle-free cleaning. This design enhances comfort and usability in both residential and light-commercial settings.
Built for New Construction or Replacement Installs
Thanks to an integrated nailing flange, OKNA double-hung windows install securely into new construction framing, while their low-profile frames make them ideal for replacement window retrofits as well. Versatile and contractor-friendly, these units simplify installs without compromising aesthetics or performance.
Strong, Weather-Resistant uPVC Frame
The multi-chamber uPVC construction improves insulation while maintaining structural integrity through all seasons. Fusion-welded corners ensure durability and air-tightness, even in high-exposure locations—making this window an excellent fit for demanding New England climates.
Efficient Thermal Performance (U-Value ≤ 0.20)
These windows are engineered to deliver impressive energy savings, achieving U-values of 0.20 Btu/hr·ft²·°F or better. With Low-E coatings, argon-filled glass units, and multi-pane glazing, they exceed many local code minimums and qualify for ENERGY STAR standards—helping reduce heating and cooling loads all year round.
Now Available in Jet Black and Other Modern Colors
The growing popularity of black window frames has made Jet Black a top choice for modern homes, apartments, and retail buildings. OKNA offers this finish and many others to meet both traditional and contemporary design needs.
Ideal for Residential and Light Commercial Projects
Whether you’re building a multi-family development, remodeling a small office, or upgrading a single-family home, OKNA double-hung windows are a smart solution.
We offer:
- Supply + Installation for residential homes, small businesses, and smaller apartment complexes
- Supply Only for larger commercial builds and development-scale projects
Yes — we install in smaller apartment complexes, but for large-scale projects, we provide windows only.
Configurable Grids, Hardware, and Sizes
Match your building’s style with:
- Hardware finishes in white, black, nickel, or bronze
- Extended jambs, screens, and size variations
- Additional performance glazing available
Technical Documentation Included with Every Order
All orders include:
- Detailed energy performance specs (U-values, SHGC, VT)
- Frame diagrams, flange dimensions, and installation guides
- Custom order confirmations
- Warranty and OKNA certification documents
The OKNA double-hung uPVC window is an ideal solution for new construction and replacement window projects across CT and Western MA. It blends dependable performance, attractive styling, and installation flexibility with energy efficiency and durability.
We proudly serve homeowners, DIY clients, contractors, builders, developers, and architects, offering install or supply-only options tailored to your project.
Request your FAST Free Quote today — and discover the difference a precision-engineered OKNA window makes.