Is .27 A Good U-factor For Windows?
Is .27 A Good U-factor For Windows? In a cold climate a good U-factor for a window is between 0.17 and 0.39. (That’s between R-6 and R-2.5). Lower is better with U-factor–the opposite of R-value, when higher is better. What is a good U-value for windows? Building regulations When it comes to windows, the regulations