What do you get when you cross a national administrator, state governments, a scientific agency, non-profit industry organisations, software developers and house builders? NatHERS - an energy modeller’s nightmare.

Section J of the National Construction Code sets the minimum standards for energy efficiency, with residential developments requiring a rating under the Nationwide House Energy Rating Scheme (NatHERS). Using accredited software, this is a star rating system which simulates proposed developments based on the dwelling dimensions, location, orientation and approximate…