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What is Low-E? What does that mean for my windows?

The term Low-E gets thrown around quite a bit when talking about replacement windows.  People ask for Low-E windows, but the term is a bit vague at best.  “Low-E” literally means low emissivity, which in turn means a surface that emits low levels of radiant heat.  All surfaces reflect, absorb, and transmit heat.  So, a