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U Value is the best way to assess the insulation efficiency of your window or door system.
Compare CycloneSafe Double Laminated Windows and Doors
or
EnviroSafe Double or Triple Glazed Windows and Doors
to single glazing.
What would you prefer for your comfort?
U-value is a measure of how effective the glass type is as an insulator.
The lower the U-value, the better the glass is as a heat insulator.