http://www.greenershelter.org/ (see both "Annualized Geo Solar" and "AGS vs PAHS") Anna Young wrote: > One method I > read about a few years ago, perhaps from this list, is annularized solar > gain. From what I remember it seemed like a simple way to add some > supplemental heat to a house during the winter months. Does anyone have any > information or links on the topic they can share? > > >