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Video explains it's best to seek window systems with low U-value

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uPVC windows are known around the world for their thermally insulating properties, keeping heat out in summer and heat in in winter. A typical uPVC double glazed window has a U-value of, or below 2.0 W/m2K which makes it a high performing window, but what about 'low-e' and 'IGUs' and all the other terms used in discussing windows?


With funding from the Office of Environment and Heritage NSW, the Australian Window Association has produced three informative videos for the fenestration industry, building industry and consumers aimed at enhancing the understanding of energy efficiency in relation to windows and doors.


Essential watching for anyone building or designing a new house, the second of the series explains the science of energy and energy efficiency in terms of windows. It succinctly explains the terminology behind the physics of high performance windows including U-Values, comparison to R-values, Solar Heat Gain Co-efficient, low-E coatings on glass, double glazing and IGUs.


This video gives a good overview of the factors to consider in choosing window products, including the benefits of low-e glass while noting that low-e is not better than double glazing, but can make improvements to double-glazing.


The video explains that not using double glazing can limit on-going energy efficiency of a home. A strong benefit of choosing low U-value windows is in moving closer to attaining thermal comfort in the home, the video says, and in therefore reducing the likelihood of excessive heating or cooling of indoor space.


Regardless of which climate zone you build in, the video says, it is always best to seek window systems with low U-value.


That's why the uPVC Window Alliance has been advocating for Australia's building codes and standards to adopt specification of maximum (low) U-values for windows, as other countries have done for years. It is time Australia stopped using poor insulating, single-glazed windows condemning Australian homeowners to decades of wasted energy.


uPVC double-glazed windows are excellent examples of window systems with low U-value. It's worth the investment, for homeowners and the country.


View The science of energy and energy efficiency here.


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