June 2007, Don Fugler. This is a short 4-page outline and summary of the scope, challenges, and research needed to undertake deep energy retrofits of Canadian homes.
This link downloads a 117-page presentation subtitled The Top Ten Design Elements of High Performance Homes. While focused on new home design, the principles apply to deep home energy retrofits.
This 26-page presentation discusses Passive House design and standards, and provides good background information.
This links to Larry Kinney’s company website, where you can download a 52-page presentation on “approaches to achieving close-to-zero-energy homes.”