![]() This is how well the glazing insulates before your frame is added. The glazing can be an important part of the U-Factor, enough so that sometimes you can get a rating for the center-of-glass-U-Factor. The U-Factor rating includes all parts of the window, such as the spacers, the frame, and the glazing. On the lower end, replacement windows can have a U-Factor of 0.25. is feet, and the ☏ is degrees Fahrenheit. The Btu stands for British thermal units, the ft. Your windows’ U-Factor rating is expressed as Btu/h However, one more thing to keep in mind with this value is the climate you live in. Ideally, you want your replacement windows to have the lowest U-Factor rating possible, so you won’t spend as much on heating bills. It represents how much heat passes through your windows. Simply put, the U-factor is the most important insulation rating for your windows. In this guide, we’ll tell you everything you need to know about the U-Factor value of your replacement windows, as well as the NRFC sticker.Īllow us to first explain the U-Factor then. ![]()
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