Window U-Factor and SHGC Explained for Arlington VA Homeowners
How U-Factor And SHGC Work In Real Homes When homeowners compare replacement windows, the conversation usually gets stuck on frame color, grille style, or whether the glass is "double pane." Those details matter, but the two numbers that tell you how a window will actually perform are U-factor and SHGC. U-factor measures how much heat passes through a window. Lower is better, because it means the window resists heat flow more effectively. SHGC is the sunlight ratin