Martin Holladay covers some very cool deep energy reduction projects here in Maine #MaineRocks
I already mentioned this retrofit job in a previous blog , when I reported on my conversations with Phil Kaplan and Claudia King on their approach to nailing down the insulation specifications for this house. At first, Claudia and Lindsey hoped the house would achieve the Passivhaus standard. However, after Marc Rosenbaum used PHPP software to determine what it would take to get there, they abandoned the idea. (Even R-44 walls weren't good enough; the PHPP software pointed towards the need for R-56 walls.) They decided that they couldn't justify spending thousands of extra dollars on Passivhaus levels of insulation to save just a few more BTUs per year. Although their superinsulated home won't achieve the Passivhaus standard, it will still have a thermal envelope that is far superior to typical residential construction.