How it Works: Low-E Glass
Low-e, or low-emissivity, glass is the go-to choice for energy-efficient windows. In this “How It Works” article, Debra Judge Silber outlines the various coatings and processes used in low-e windows. Different types of coatings let in different amounts of UV-rays, infrared-heat rays, and visible light. Low-e windows strive to block UV-rays, admit as much visible light as possible, and manage infrared-heat rays to the best advantage of the house for either solar control or passive-solar gain, depending on its climate zone. Low-e glass uses either sputtered coatings for solar control or pyrolitic coatings for passive-solar gain.