Do all software packages give the same star rating for the same house?
Not always. The older first generation tools such as BERS, NatHERS and FirstRate used different methods to create the building description and they calculate their results in different ways. The star ratings they produce may differ slightly. First generation software tools are being phased out in 2007. All second generation tools are required to meet stringent requirements and will be accredited to the Scheme only if they demonstrate that results from a specified sample of buildings are consistent with those published by the National Administrator.
