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I just received a copy of an interesting e-mail exchange between Peter Amerongen, the developer of the Riverdale Net Zero project in Edmonton, and Gary Proskiw, the author of a study on the cost-effectiveness of large expances of south-facing glazing.
I have appended Gary's response to Peter to my September 2012 blog on the topic (Study Shows That Expensive Windows Yield Meager Energy Returns ).
If anyone is interested in this new material, look for the additional paragraphs at the bottom of the main text of the blog, under the subhead "An interesting postscript."
Below is a graph that Gary included in his e-mail.