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Hey Rick, Don't forget that the earth maintains a constant temperature. Geothermal actually is an air conditioner in the summer. It's the best of both worlds.
FYI the DIY option you are looking for is called an "earth tube" and you can find some write up on "Build it solar"
Cheap Geothermal system
DIY Mini Greenhouse
[Experimental] Mini Greenhouses
DIY verandah-style greenhouse, sunspace, draught lobby, made from recuperated wood and …
Geodesic Dome Greenhouse - Part 9 - Polycarbonate!
Unheated movable seed starting greenhouse
DIY Greenhouse Heater
My eco-friendly home
How to free-range Organic Baby Quail and employ them in weeding and eating pests in the…
The 5 Dollar Greenhouse. How to make a Smart, Low-Cost, Recycled Untreated Pallet-Wood…
Posted:Mar 27, 2011
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