What Is Low-E Glass?
From the beginning: the "E" is for emissivity. When heat or light energy is absorbed by a surface, such as glass, it's either reflected off the surface, or radiated through the surface. A material's ability to radiate energy is known as emissivity. What does that have to do with your windows? If you've ever been in a greenhouse, you probably already know the answer to that question.
Radiating energy is one of the leading causes of heat transfer in window glass. emissivity (or low-e) windows radiate less energy, and therefore transmit less heat, which gives them greatly enhanced insulating properties. When heat energy—either from the sun or from your HVAC—strikes a low-e window pane, it is reflected back into the space it came from instead of being transferred through the window.
Choosing Low-E Glass
Homeowners have a lot to consider when choosing new low-e replacement windows for their home. The most crucial consideration is choosing the right windows for your climate, depending on whether you're most concerned about keeping your home cool during warm weather, or keeping it warm in the winter. The right combination of windows, when installed correctly, can do both.
While glass with a passive low-e coating is great for northern homes, and solar control low-e windows are great for hot southern locations, there's still a lot of grey area in which it can be challenging to choose. In these cases, it's helpful to have a knowledgeable glass professional to help guide you through the selection process. It's also important to know some of the terminology that manufacturers often use to grade their low-e windows:
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