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Q: Why is the window U value different to that of the glass?

Q: Why is the window U value different to that of the glass?

Update Time:2023/9/20

A: The U value for a window is the combination of the U value of the glass and the U value of the frame. The frame is made of a different material to the glass so will have a different U value to the glass. The overall U values of window system using aluminium, timber or PVC frames for example will all be different even if the same glass is used in each case.