Glass Information


Glass Features & Options

Therma kraft glass packages deliver the ideal energy balance of solar heat control, high visibility and fade protection. With our gas filled chambers and low-E coatings, our windows provide high levels of climate protection year-round with optimal comfort and energy savings. Plus, they reduce your environmental impact by reducing energy consumption.

Our glass options can meet and exceed Energy Stars latest 2017 requirements. Ask your Therma Kraft window expert how you can qualify for a tax credit using our high performance windows.

RatingGlassGas FillerDescription2017 Energy Star
The bestTRIPLE GLAZEArgonU-factor as low as 0.20Exeeds
BetterLow -E3ArgonU-factor as low as 0.25Yes
Very GoodLow -E2ArgonU-factor as low as 0.32Yes
GoodCLEARArgonU-factor as low as 0.45Yes

Low-E (low-emissivity) glass is coated with a low-emittance material designed to reflect heat. A window made with Low-E glass repels ultraviolet rays that generate heat during the summer but absorbs UV rays and lets heat in during winter. The better insulated the window glass, the more comfortable your room temperature..

Low-E 272
Low-E 272 Glass delivers year-round comfort, reflecting an intermediate level of heat back into the room in winter and rejecting the sun’s heat and uv rays in summer. This product’s patented coating provides clarity and high-performance low-solar control, reducing window heat gain by 50% compared to ordinary glass.

Low-E 366
The ultimate performance glass, Low-E 366 provides the highest levels of year-round comfort and greatest energy savings. Its patented coating offers an ideal balance of solar control and high visibility. Blocking up to 95% of the sun’s damaging rays, Low-E 366 glass sets a new standard in energy performance.

Super Spaces and triple Glaze
Window and glass spacers are the seals that sit between panes of glass in a window. Over the years, the window manufacturing industry has seen quite a swing in terms of materials and technologies used to make window glass spacers.
As the push to create more energy-efficient home-building materials increases, more and more manufacturers are turning to new types of glass spacers to boost the “greening” of their products.
The material used to manufacture the glass spacer is one of the most important factors in whether a window is energy efficient. Glass spacers play an important part in a window’s overall performance in this area, as they determine the amount of heat and cold that is able to pass through a window’s panes.
Panes of glass in insulated glass are held apart by spacers. Spacers impact the overall performance of the insulated glass. The quality of the materials used to produce spacers, their longevity, flexibility and thermal properties are critical.
Good spacer should do 4 things:

  • Absorb stress caused by thermal expansion and contraction
  • Block moisture and water vapor that can fog glass
  • Create a tight seal that prevents leakage of special gas fills
  • Increase the temperature of the edges of the insulated glass – this can help reduce condensation and increase overall energy efficiency of the window

Why is spacer so important?

  • On the outside of your home, windows have to stand up to the extreme weather conditions all year round. They face changes in temperature, wind loads, barometric pressure. Additionally, windows are bombarded with harmful UV rays from the Sun. On the inside of your home, windows have to face changes in temperatures, too. And because the edges of the insulated glass are the coldest parts of the window, they are the most susceptible to condensation. Condensation most often occurs in well insulated and weather tight homes. Not only can window condensation lead to damaging your woodwork and draperies but also it can fuel mold growth.


Therma Kraft offers a transferable lifetime warranty on its residential window and door products. Therma Kraft guarantees that each window and door is of good material and workmanship and free from defects that would render such window and/or door unserviceable for recommended use.

Immediately upon discovering window and/or door defect contact in writing your dealer or distributor from whom the window and/or door was purchased or to:
Therma Kraft Corp, 740 Bonnie Ln, Elk Grove Village, IL 60007