In this session we’ll look at three deep energy retrofits: a single family that approaches Net Zero, a two-family that approaches EnerPHit (the Passive House retrofit standard), and a three-family with co-generation. All of the projects were completed by mid-2011 we have nearly three years of actual performance data to share. Our retrospective on these projects will include hard data on the initial retrofit costs; energy performance data; payback analysis; indoor air quality monitoring results; first-hand feedback from the occupants with regard to what it’s like to own, operate, and live in a home that’s undergone a deep energy retrofit; and lessons learned over time as a result of our direct experience with these projects.