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What Are Low-E Windows & How Do They Work?

You may have heard of Low-E glass if you are shopping for an energy-efficient window. It is usually available as Low-E windows, Low-E doors, Low-E storm windows, and Low-E impact windows.

But what exactly are Low-E windows, how do they work, and does Low-E glass look different? If you’re curious about Low-E windows or other Low-E glass, read on as we answer your questions below.

What are Low-E windows?

The term Low-E means “low emissivity.” It refers to a colorless, microscopically-thin metallic oxide coating applied to glass that blocks UV and infrared light while allowing in natural light. Low-E coating also reflects internal heat back into the home.

Glass treated with Low-E is known as Low-E glass, while the application of Low-E to windows gives Low-E windows. Depending on your needs, your Low-E glass can be Low-E impact windows, Low-E storm windows, Low-E doors, and so on.

Therefore, Low-E windows are windows that keep the internal temperature consistent, keeping your home warm in winter and cool in summer.

How do Low-E windows work?

Thanks to the coating, Low-E windows are selectively reflective, preventing Infrared (IR) and Ultraviolet (UV) lights from passing through while allowing natural light to enter your home.

Low-E windows work similarly to a thermos with a silver lining. When you place hot liquid inside a thermos, the silver lining reflects the heat back as it tries to escape. This ensures that the liquid remains hot. In the case of cold liquid, the silver lining works by preventing heat entry from outside, keeping the liquid cold.

In the winter, Low-E windows reflect heat back into the building, keeping the home warm. And in the summer, Low-E windows prevent the sun’s heat from entering the house, helping to maintain a cool indoor temperature. By blocking out UV light, Low-E glass minimizes the fading of furniture and other interior items. Its energy efficiency also enables you to save on energy costs.

Does Low-E glass look different?

You may be wondering whether Low-E coating alters the appearance of Low-E glass windows and doors. The answer is NO. The presence of the coating does not impact the appearance or aesthetics of a glass window.

In fact, the coating is thinner than human hair and is virtually invisible to the naked eye. Whether you install a Low-E storm window or a Low-E impact window, you won’t notice the difference.

Can you apply Low-E coating to regular glass?

Many have asked if they can treat their regular glass with Low-E coating. The answer is NO. The coating is applied during the manufacturing process. So if you want Low-E windows, Low-E impact windows, Low-E doors, or Low-E storm windows, you’ll have to purchase them.

Enjoy more benefits with Low-E impact windows

Low-E windows and impact windows offer massive benefits on their own. Now, imagine combining the benefits of Low-E glass with the safety and durability of an impact window. It seems unreal.

With Low-E impact windows or Low-E storm windows, you get an all-in-one solution that defends your home against hurricanes and other extreme weather events while ensuring a consistent and comfortable internal environment. Request an estimate today.


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