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Low E Window Film Explained in Under 2 Minutes

September 21, 2011 | 4 comments

When it comes to year-round temperature control, the first concern that comes to mind for property owners is budget. Making the final buying decision on products, such as commercial window film, that impact temperature control can be difficult. However, with the introduction of low-emissivity (low e) window film, the decision should be more clear-cut, as low e films help provide energy savings in both warm and cold weather months. Here is a quick explanation of how low e window film works and a few reasons to consider investing in it.

Glass insulating capabilities

Low e technology enhances a window’s insulating power, significantly reducing heat loss. Like standard window film, it keeps the heat out in summer months. However, what makes this revolutionary film so unique is how it keeps heat in during the winter months. The insulated window film reflects the heat back to its source, locking it inside the building. The additional layer of film essentially transforms a single-pane clear window into a dual-pane, and a dual-pane into a triple.

More annual savings

Because of its glass insulating capabilities, commercial window film that utilizes a low e coating will help create annual financial savings. It not only reduces heat loss in the winter but also reduces heat gain in the summer, in turn decreasing the operational time of a heating or cooling system. As a result, energy costs can be reduced significantly. Learn more about EnerLogic window film to better understand the substantial return on investment for quality commercial window tint.

UV and glare reduction

In addition to reducing energy expenditures, low e window film will help maintain window views and natural light sources. While standard window films are typically tinted, low e commercial window films are virtually clear. Additionally, just like standard window tint, low e film significantly reduces harmful UV rays and obstructive glare.

If you want to find ways to create a more energy efficient facility with innovative technology, see how EnerLogic compares  to other potential solutions.


  1. Bob Berry
    October 1, 2011

    Low e glass does not change the insulation value significantly of glass. It is unlikely that the change in insulation ability is even measureable. Low e glass prevents electromagnetic radiation of certain wavelengths from passing through the window, this is unrelated to its insulation value.

  2. Vista
    October 6, 2011

    According to the National Fenestration Rating Council and all the data provided by glass and window manufacturers over the past 20 years, the use of low-e coatings has a pronounced effect on improving a window’s insulating performance.

    In fact, most building codes require the use of low-e glass in homes and commercial buildings to meet the insulating performance requirements for windows. The effect of low-e coatings on glass, and now window films such as EnerLogic, can provide a substantial improvement in center-of-glass insulating performance or U-value. For example, a dual-pane window with 3mm thick panes, and a 12mm air space has a center-of-glass (COG) U-value of 0.481 (based on the Lawrence Berkeley National Labs’ Window Program). By replacing the outer pane with a product such as PPG SolarBan 60, the COG U-value is reduced to 0.294, a 39% improvement. Almost similar improvements are now available with a window film such as EnerLogic. Hopefully this clears up any confusion from my previous posting.

  3. Low E Glass
    May 6, 2014

    A low-e glass window (which stands for low emissivity) is simply a windowpane coated in microscopic layers of metallic oxides. The coating appears invisible to the naked eye, allowing as much natural light into the house as possible.

  4. Vista
    May 22, 2014

    Thanks for your comment! It is also important to note that low-e coatings are very effective at improving a window’s insulating performance. In fact, adding EnerLogic window film to a single-pane window makes the window insulating performance equal to that of a dual-pane window. The low-e coating of EnerLogic achieves this high level of performance by reflecting 93% of the room’s infrared heat back into the room. Most window glass only reflects 16% of this energy.

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