Posted By greenovision on 29 Apr 2014 12:44 PM egouin on post #126One thing to note here.... Eds calculation contains no south facing glazing.... Maybe why heat gain is not occurring. And I agree with Stephen T windows can contribute... American versions of Passive haus are quickly ditching passive solar for engineered control in lieu of smaller energy efficient windows and HRV systems. Lets remember free heat (passive solar) and lets remember making windows smaller reduces daylighting... daylighting is healthy and beautiful light (a write up here on Benefits of Passive solar). I wrote a blog about technology striping beauty out of the picture here. Thanks for hearing me out Mark