Green roofs are the rage, but green walls are up and coming.  ”…The benefits of green walls are not only for aesthetics’ sake, but can also provide shade and cooling for solar heating.  Over time there has emerged a number of products for green walls – some consist of simple trays hanging with soil and others work with hanging textiles (nonwoven, etc.).  I will not evaluate these methods, but only describe the basic technique in my proposal for a vertical planting technique. …”

Greenroofs.com: In the Shadow of the Vertical Garden, By Lars Kronborg Bak.

 So, now that I’m almost completely insulated, I’m setting up my own solar air heater to start with. Not because it’s the most efficient, but because it’s the most bang for the buck, and it’s a good learning experience.  I’ve made it to be removeable, upgradeable, or even redeployed with a little elbow grease.  Worst case I can burn the wood parts in a rocket stove if I get desparate enough, and sell the scrap metal by the pound – but I think I’ll be working with it for awhile.  Check out his site – it’s worth the read into the old usenet posts too – you’ll be amazed!

Solar Closets and Sunspaces.