Okna Window Products

Exceptional Energy Savings

Our energy saving window options will keep your family and your wallet happy.

OKNA Windows & Doors has built an industry reputation by combining state of the art equipment, advanced technologies, and dedicated craftsmanship.

Our name has become synonymous with innovation, quality, and performance. Advanced automated equipment and computer-controlled production lines ensure a high standard of quality control as well as the ability to meet large volume requirements quickly.


Advanced Features

Energy efficient windows are manufactured so that heat is kept inside the home in winter and outside the home in summer. This reduces heatng and cooling costs, minimizes energy consumption impacting the environment, and limits the size of the HVAC equipment required for keeping the home comfortable. In climates that mainly require cooling, windows have represented a major source of unwanted heat gain. In recent years, windows have undergone a technological revolution. It is now possible to significantly reduce solar heat gain and improve comfort while providing clear views and daylight. In warm regions, this means that high-performance windows can face into the sun if desired without great energy penalties – although shading techniques remain important.

ClimaGuard is comprised of eleven optical tuned layers, providing optimal climate control, neutral aesthetics and plenty of natural light. These coatings consist of multiple layers of metals whose combined thickness is only 1/1000th the thickness of human hair!

Daylight and view are two fundamental attributes of a window. Unfortunately, windows are also the source of significant solar heat gain during times when it is unwanted. Traditional solutions to reducing solar heat gain, such as tinted glazing or shades, mean that the amount of light is reduced as well. ClimaGuard with low-solar-gain (spectrally selective) coatings can provide better solar heat gain reduction than tinted glass, with a minimal loss of visible light. This also means that views can be clearer and unobstructed.

Many organic materials, such as carpet, fabrics, paper, artwork, paints, and wood may fade upon exposure to sunlight. Window selection can influence the type and intensity of transmitted radiation. The most harmful radiation in sunlight is the ultravioulet (UV) rays, which are the most energetic and thus most likely to break chemical bonds, leading to fading and degradation. Glass blocks all UV radiation below 300 nm, but transmits UV rays from 300-380 nm. Coatings on glass can reduce the UV rays transmitted by up to 80%

Vinyl Windows

600 Series Windows


Download the Okna ECO-PRO 600 Series Window Brochure:
Starmark Evo Windows Installed and Serviced by Window Works of Chattanooga

Composite Windows

7500 Series Windows


Download the Starmark Evo 7500 Series Window Brochure:

Vinyl Windows

600 Series Windows


Download the Okna Enviro-Star Series Window Brochure:

Chattanooga's Best Windows, Siding & Door Estimates

Actual appointment date and time may differ. We will contact you to finalize an actual schedule while
working to schedule your requested date and time to the best of our abilities.

Siding Style Guide

From basic design to ambitious detail, the ideal home often starts with a personal inspiration. A rich color that draws your eye, or a new twist to an established style. It’s an infusion of craftsmanship and artistry, distinctive in personality from the angles of the rooftop to the color of the front door. Most of all, the ideal home is a familiar and welcoming space, a mix of quality and culture . . . uniquely revealed in the spirit of you.

Get help selecting siding that coordinates beautifully with your exterior.