Low e Glass Image

Low e Glass

Posted on July 25, 2017

Owning a home is no simple task. You must know a lot of little details about many important things.

A not-so-obvious factor to consider when looking at a home is the material used for the windows. A low e coating on a glass window affects overall heating, lighting and cooling in a home, and that should not be overlooked.

So what exactly is low e glass?

First off, let me give you a quick cheat sheet.
• “e” = emissivity
• Emissivity = the ability of a material to radiate energy
• Ultraviolent (UV) energy = light
• Infrared energy = heat

The amount of emissivity determines if a material will absorb energy or reflect it. When it comes to windows, the point is to minimize the amount of external UV and infrared energy that passes through the glass without compromising the actual, visible light transmitted into the home.

High e
Dull, darker materials have a lot of emissivity and absorb energy. So when the UV and infrared energy pass through it, it’s re-radiated by the glass surface, filling the home with external light and heat. Therefore, cooling systems must work harder to compensate for the absorbed energy, and you pay more money.

Low e Glass
On the flip side, highly reflective materials have little emissivity and offer better insulation, protecting from external temperatures and keeping your home, and wallet, cool.

So basically…
• Low e glass = highly reflective = insulation = GOOD!
• High e glass = dull, darker = absorption = BAD!

Test your windows!
Hold up a lit match in front of the window. A double pane will reflect four, flame images. If a low e coating is present, one of the four images will be a different color than the rest. If there is no low e coating, all the images will be the same color, and, if you want energy efficient windows, you’ll seek out ways to get a low e coating on your glass.

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