The Window Source of the Tri-Cities

3036 Highway 75 Kingsport, TN 37663

Call us today!

423-406-8600

What is Warm-Edge Technology?

There is Science Behind Energy Efficient Windows.

The layers of glazing in an Insulated Glass Unit (IGU) must be held apart at the appropriate distance by spacers. Because of its excellent structural properties, window manufacturers started using aluminum spacers in the 1960s and 1970s. Unfortunately, aluminum is an excellent conductor of heat and the aluminum spacer used in most standard edge systems represented a significant thermal “short circuit” at the edge of the insulating glass unit, which reduces the benefits of improved glazings. In addition to the increased heat loss, the colder edge is more prone to condensation.

All Window Source windows utilize the latest warm edge spacer technologies that reduce thermal conductivity while improving surface and corner appearance over other insulating glass spacers. Our innovative warm edge spacer systems save energy by insulating the frame and edge of the insulated glass unit making the unit much less conductive around the perimeter.

Warm edge spacers have become increasingly important as manufacturers switch from conventional double glazing to higher-performance glazing. For purposes of determining the overall window U-factor, the edge spacer has an effect that extends beyond the physical size of the spacer to a band about 2-1/2 inches (64 mm) wide. The contribution of this 2-1/2-inch-wide “glass edge” to the total window U-factor depends on the size of the window. Glass edge effects are more important for smaller windows, which have a proportionately larger glass edge area. For a typical residential-size window (3 by 4 feet/0.8 by 1.2 meters), changing from a standard aluminum edge to a good-quality warm edge will reduce the overall window U-factor by approximately .02 Btu/hr-sq ft-°F.
A more significant benefit may be the rise in interior surface temperature at the bottom edge of the window, which is most subject to condensation. With an outside temperature of 0°F, a thermally improved spacer could result in temperature increases of 6-8°F (3-4°C) at the window sightline–or 4-6°F (2-4°C) at a point one inch in from the sightline, which is an important improvement. As new highly insulating multiple layer windows are developed, the improved edge spacer becomes an even more important element.

Call The Window Source Of The Tri-Cities For A Free Estimate!

See What Our Customers Are Saying About Us

“I love my new windows! The whole experience from placing the order to installation has been great. The windows are very well made and was exactly what I wanted. It is nice to deal with people who are honest, hard working, and stand behind their products. Great job guys!”

Sandra Waldon; Blountville TN

“From the professionalism of Duane, the owner, to the perfection of the window installer – Joe-it has been an all around wonderful experience. The windows are gorgeous! My custom entry door is beyond what I could have imagined.”

Shelly Good; Johnson City TN

“The BEST team I have ever worked with! 5 STARS!”

Susan Smith; Johnson City, TN

“Provided us with great quality windows for our church parsonage. Very quick in order process and installation.”

Ruthie Williams; Flag Pond, TN

“Went above and beyond.  Love our new windows.  Couldn’t be more pleased.”

MW; Kingsport, TN