Solar Chimney: Awesome free-energy design to cool any building for little $$.
Direct Gain Trombe Wall
This is my absolute FAVORITE: solar thermal panels on your roof can heat your house, your water, and generate no-transmission-loss electricity . . . even on a cloudy day! This technology is a game changer!
enessere wind turbine hercules
DIY Video : How to build a Homemade Heat Pump Water Heater from an Old Air Conditioner and refrigerator parts