I thought that Energy Star guidelines required that the SHGC be limited. There was a Star Tribune article a few years back that said to skip the Energy Star windows on the south side so you can get the solar gain in the winter since that is where most of our climate control energy goes, heating and to use the energy star windows for the rest of the house. I'm not sure if all of that is accurate at all since I thought the Minnesota St Fair guys who did their passive house used Serious Windows, I figured they qualified as energy star. SHGC was 0.5 I think.
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