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The ABC of Low-E Windows and Doors

by Gates Dearen
A recent HomeRite project
If you’ve looked into getting replacement windows lately, you’ve probably run into some terminology you’re not familiar with. For example, one phrase that you’re almost certain to run into is “Low-e.” Just what does the “e” stand for? Emissivity. It’s not a word most people use or hear very often. Here’s a definition from the Merriam-Webster dictionary.
Emissivity:  the relative power of a surface to emit heat by radiation, the ratio of the radiant energy emitted by a surface to that emitted by a black body at the same temperature.