Epic Greenhouse Rocket Mass Heater - The insulation board has be laid in on the floor of the thermal-mass trench, inches of gravel added, and now the pipe has been assembled with a single screw holding each section of pipe together.
21 DIY Greenhouses with Great Tutorials: Ultimate collection of THE BEST tutorials on how to build amazing DIY greenhouses, hoop tunnels and cold frames! Lots of inspirations to get you started! - A P (Diy Ideas Outdoor)
Build a $300 underground greenhouse for year-round gardening (Video)
A much more affordable and effective alternative to glass greenhouses is the walipini (an Aymara Indian word for a "place of warmth"), also known as an underground or pit greenhouse. How a walipini works, and how to build it:
DIY Greenhouse Underground A trench runs down the middle of this DIY greenhouse for any climate. The concrete block walls form a heat sink that soak up the heat during the day and release it slowly as temperature cool. Farm and Garden - GRIT Magazine
When you're living at 7,750 feet above sea level, with a summer growing season of 80 days, at best, between killing freezes, how can you grow your own food? The answer, as it turns out, is pretty cool: A geodesic dome solar greenhouse.