The good people over at Byggmeister Associates, building science geeks one and all, are at the leading edge of residential net-zero energy retrofits.

Photos and text can be seen on their website http://www.byggmeister.com/services_energy.shtml

As an impoverished custodian of a circa 1860s Italianate Victorian that has 11 exterior walls(!) which was last insulated in the 1970s, I can only view their work with unmitigated envy and lust.

We look forward to the day when we can retrofit our abode with their expert guidance.