Energy Performance Ratings for Windows, Doors, and Skylights
https://www.energy.gov/energysaver/energy-performance-ratings-windows-doors-and-skylights
WebFor windows, skylights, and glass doors, a U-factor may refer to just the glass or glazing alone. NFRC U-factor ratings, however, represent the entire window performance, including frame and spacer material. The lower the U-factor, the more energy-efficient the window, door, or skylight.
DA: 23 PA: 5 MOZ Rank: 5