Windows lose and gain heat by conduction, convection, radiation and air leakage. This heat transfer is expressed with U-values.
As a rating of energy efficiency, U-value can be used to consider performance of windows, exterior doors, skylights and all other exterior building components, including exterior walls.
In windows, the U-value measures how well heat is transferred by the entire window, that is the frame, sash and glass combined.
The lower the U-value, the more
Double-glazed, uPVC windows are a relatively new trend to sweep Australia. PVC windows were first used in Europe in 1940, by the late 1960’s it had established an important market share. Since the 1970’s uPVC has increasingly dominated the US market, now it is the most commonly used window framing material in the U.S. In Australia uPVC windows were introduced in the mid 1980’s, however they still hold a relatively small market share. Windows are the weakest link in the insula
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