Crofton Custom Windows and Doors Replacement Checklist 2205

The Basic Meaning Of U-Factor U-factor measures heat flow through a window, so a lower U-factor generally means the window resists heat loss more effectively. That matters in Maryland because the weather swings hard enough to expose weak windows fast. A lot of people confuse U-factor with solar heat gain coefficient, or SHGC, but they are not the same thing. A strong U-factor means the entire window assembly is doing a better job of resisting heat movement, not