I wanted to let people know about one of the most far reaching and innovative energy efficiency movements in construction called the Passive House Movement. It started in Germany perhaps 12-15 years ago spurred on by the Kyoto Protocol and the German Government. Over 15,000 of these houses have been built in Central Europe and the concept is spreading fast. There have been few cold climate models but there are many experiments underway. The idea is similar to net zero but more innovative. You can find out more details in the links below. You can read a report of the 3rd annual Passive House Conference in the US just held in Duluth, MN here: http://www.energybulletin.net/node/47457 And you can visit the US passive house center here: http://www.passivehouse.us/passiveHouse/PHIUSHome.html There is even a smaller movement of building designers working on combining the Passive House concept with Natural Building. The passive house model is based on real use rather than designs and is backed up with fuel use receipts. If anyone knows of anyone trying a Passive House in VT, please let me know. Cheers, Ben Those who give up freedom for safety, deserve neither. Benjamin Franklin __________________________________________________________ Ben Graham www.naturaldesignbuild.us Natural building/design services/workshops/consulting Integrating Culture and Nature 802.454.1167