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This is the ninth in our series of videos about the Energy Retrofit of the old fibro cottage next to the Greeny Flat. In this episode we go into greater detail about how Passive Solar Design works, how it is applied in a new building like the Greeny Flat and how it can be used to improve the energy performance of an existing building. Specifically we look at what is a Trombe Wall and how we are retrofitting one into the old cottage.