What is U-Factor and Why is it Important?

What is a u-factor and why is it important to homeowners? The U-factor, also known as the U-value, is a measure of how well a window can prevent heat from escaping a building. It is defined as the amount of heat that passes through one square foot of a window per hour when there is a temperature difference of one degree Fahrenheit between the indoor and outdoor air. The lower the U-factor, the better the window's insulation properties are.

Windows with low U-factors are essential for energy-efficient buildings as they help reduce heating and cooling costs. The National Fenestration Rating Council (NFRC) rates windows based on their U-factor, solar heat gain coefficient, visible transmittance, and air leakage. The U-factor rating takes into account the entire window assembly, including the frame and glass.

The U-factor rating system varies depending on the region where the window will be installed. In colder climates, windows with lower U-factors are recommended to keep heat inside buildings. In warmer climates, windows with higher U-factors are recommended to allow excess heat to escape.

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