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Green home ratings don’t reflect real energy use

Most “green” energy rating systems are not reliable because they are based on assumptions rather than the reality of how buildings are used, according to a national research centre.

The Cooperative Research Centre for Low Carbon Living has found that although these rating systems can improve the environmental design of buildings, they cannot accurately predict post-occupancy energy consumption.

In a CRC editorial published on 18 January, chief executive Deo Prasad says an analysis of widely used environmental performance indexes such as GreenStar and EnergyPlus showed they “were not successful in testing compliance for zero carbon performance”.

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