OKNA: Premium Windows, Proven Performance
Windows on Washington only installs high performance, energy efficient windows that meet our standards. OKNA windows earn that distinction through advanced engineering, precision manufacturing, and proven long-term performance. We do the research so you don’t have to – installing windows built to last, enhance your home’s appearance, and keep your family comfortable year round.
Request a Quote
American-Made | Precision Engineered | In-House Installers | Lifetime Service Warranty
Smarter Glass for a More Comfortable Home
OKNA windows use HeatSeal® glass with ClimaGuard® Low-E technology to control heat, light, and comfort without sacrificing clear views or natural daylight.
What makes it different:
- 11 microscopically thin, optically tuned layers manage heat and light with precision
- Engineered to your unique climate conditions, home orientation/sun exposure, and performance goals
- Reflects unwanted solar heat and UV rays while letting in natural light
- Reduces summer heat gain and winter heat loss for year-round comfort
- Clear, neutral appearance — no dark tint or mirror effect
- Helps lower energy costs and protects furniture and flooring from sun damage
Unlike tinted glass, OKNA’s spectrally selective Low-E coatings reduce heat without dimming your home — delivering efficiency, comfort, and clarity in one engineered system. With this custom engineered approach, OKNA windows consistently outperform standard replacement windows in real-world conditions.
| Feature | OKNA Windows | Standard Replacement Windows |
|---|---|---|
| Air infiltration | Industry-leading | Varies widely |
| Frame construction | Fully welded | Often mechanically joined |
| Glass packages | Advanced, customizable | Limited options |
| Long-term durability | Designed for decades | Dependent on install + materials |
| Made in USA | Yes | Sometimes |
What Homeowners Notice after OKNA installation
- Rooms feel more even in temperature
- Outside noise noticeably reduced
- HVAC runs less frequently /lower bills
- Fewer cold drafts and less heat gain
- Windows feel solid and quiet
- Windows operate effortlessly
What OKNA Window Is Right for My Home?
OKNA Windows offers several options to fit your design needs and budget. Here are a few of our favorites.
OKNA Starmark Evo 7500
OKNA Starmark Evo 7500 Casement Windows offer beauty and functionality. The superior design makes it ideal for not only single windows but also for multiple assemblies such as bows, bays, and picture windows, as well as your own original combinations. A beveled screen frame offers the appearance of wood molding for added beauty.
OKNA Enviro-Star 800
The OKNA Enviro-Star 800 is Okna’s premier replacement window. The Enviro-Star combines superb craftsmanship with an Old World look and feel. This series offers myriad glass and structural options to seamlessly blend with any décor, while providing the utmost in energy efficiency. Since all OKNA products are custom-made, you can be sure of a perfect fit every time.
OKNA Insul-Tec 500
The OKNA Insul-Tec 500 combines excellent craftsmanship with a traditional look and feel. This series offers all the benefits you have come to expect from vinyl windows, with a variety of options to make your home energy-efficient and enhance its beauty. Since all OKNA Windows products are custom-made, you can be sure of a perfect fit, which translates to savings on time and labor during installation.
Our Reviews Speak for Themselves
Our reputation for client service excellence means everything to us. Our Client Care process ensures you are informed throughout your project, with no surprises. As you can see from our hundreds of 5-star reviews, we consistently exceed our clients’ expectations. We look forward to showing you the “WoW difference” in home improvement contracting.
Everyone at WoW went above and beyond, and exceeded my already high expectations. Our house is now warmer, quieter, and looks so much better!
Anne D.
Simply put, it was one of the best contracting / house project experiences we’ve had.
Trey P.
What it's like to install OKNA windows with WoW
OKNA windows are engineered to exacting standards — which is why we install them using our own trained, in-house crews, not subcontractors. What you can expect:
- In-home evaluation focused on comfort, layout, and usage
- Product selection tailored to your home, not a one-size package
- Professional installation by WoW employees, not subcontractors
- Final walkthrough and performance check
Every OKNA window we install is backed by WoW’s lifetime service warranty — so your investment is protected long after installation day.
Curious about your home improvement options?
Helpful Resources
Home Improvement Contractor
Air Sealing and Insulation
Home Improvement
Home Improvement Contractor
Home Improvement Mistakes
Home Improvement Contractor
Client Project
