Have you looked into annualized geo solar?
http://greenershelter.org/index.php?pg=3

Store summer heat in the soil (10 ft) under your foundation, where it radiates through the floor 6 mo later.

Another use for your roof!

Posted by: VWfeature at August 27, 2008 11:57 AM in response to Green on Brownstoner #1: Salvage on a Budget