This book clearly describes more than a hundred creative concepts for solar space heating. (builditsolar.com)
In my case, the system involves very little extra cost or work because nearly all the components are already there for the existing solar space heating system. (builditsolar.com)
In 1977 I bought a 2,000 square foot uninsulated house in upstate New York which got me interested in solar space heating. (builditsolar.com)