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A U-value is a measurement that indicates a windowu2019s glass or other materialu2019s thermal efficiency u2013 the lower a materialu2019s U-value is, the longer it takes for heat to pass through.<br>With an average U-Value of just 0.7W/(mu00b2K), retrofitted sash windows with vacuum double glazing are at the top of the market for energy efficiency.<br>These efficient windows ensure that properties provide a cosy place to keep warm throughout the winter and prevent energy bills from getting too high. Read more here https://chameleon-decorators.co.uk/blog/u-values-for-windows/
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