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I received this photo from the client showing low angled winter sunlight entering the house at around 3pm in late June. Just after the New Zealand winter Solstice which was on the 22 of June 2023, at 2:57 am.

You can see the sunlight and shadow on the 3d printed thermal mass walls. The sunlight angle is at around 23 degrees, as the sun starts to make its Westerly descent.

So, the design of the house is based around optimal seasonal sunlight exposure, and we are using thermal mass walls, with thermally broken insulated concrete slabs to passively heat the house, using passive solar gain techniques.

We are aiming to achieve an internal passive temperature range of between 18-24 degrees in mid-June.