From my studies of physics and energy-system basics I have learned that solar energy can be harnessed with a simple panel, which converts the sunlight's energy into heat, or a complex panel (also known as a photovoltaic panel), which converts the sunlight's energy into a DC electrical current. A complex panel (to simplify it somewhat) is made from a wire between two alternate layers of silicon phases. A simple panel is made from a specially conductive, near-flat rectangular prism of grey glass or silicon. These are "heating panels". I have read Sue Robishaw's references to having panels like this installed in her home. Are they that easy to find? I don't remember Gaiam or Jade Mtn. selling them, but is that simply because they are locally available if you know where to look?