What Are the U-Value and R-Value of Low-E Windows?
The Quick Answer Double-pane Low-E windows land in a moderate-to-good range for U-factor. Triple-pane windows, especially with a denser gas fill, push noticeably lower — which is just a technical way of saying “better insulated.” But here’s the catch, and it’s the one thing worth remembering out of this whole article: none of these numbers […]
