I am engaging Morrison Hershfield (http://www.morrisonhershfield.com/Pages/default.aspx) to do the energy modelling. The target is 90% of less than typical construction, maybe even full net zero. The primary innovation is the design of ancillary spaces in the building; elevator, lobby (entrance) and stairwell so that they will only be kept at a maximum of 5 degrees C on cool days. We will be cooling those spaces on cold sunny days to heat the remainder of the building and store heat for use at night. The principal facade of the building faces SSE.
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