Quote:
Originally Posted by Daox
Our neighbors have two greenhouses that are of fair size (not gigantic) on their 2 acre lot. They're made of two layers of plastic and they blow air between them creating a baloon effect and an air barrier for some insulation value. With this setup and some foam insulation around the perimeter they're able to grow year round. In winter they grow lettuce and spinach which can handle mildly freezing temperatures down to the high teens (degrees F).
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Low Cost DIY greenhouse design of similar construction:
greenhouse