Passive Solar Greenhouse Plans_04
Researched and written by Jim Thomas
Heat From the Earth
Pit Greenhouse Experiments
Those of us who have built successful passive solar greenhouses are aware that the secret to success is "stability."
In other words, don't let things become extreme. Maintaining a stable and moderate growing environment comprised of temperature and moisture - not too hot, not too cold, not too wet and not too dry - is the key. So, any greenhouse with too much glazing and no ventilation will bake potatoes, while a lack of insulation at night will keep meat from spoiling. These are not growing conditions. Summer highs and winter lows are also part of the pendulum of extremes one must deal with while trying to keep things stable for the sake of the plants you are growing.
Most people know that the temperature the earth down about eight feet is an even fifty-two degrees year round, regardless of season or location. The earth has its own internal, stable heat, free from freezing as well at that depth, regardless of season. This is why foundations for new homes are dug at least three feet deep to get below the frost line.
So, the next step in greenhouse construction, in the constant search for stability, is to dig a pit or cavity into the earth beneath the glazing and other protection from the weather. Our micro-climate within the greenhouse becomes easier to control where the earth itself provides this "flywheel" effect of calming of the extremes.
We've collected from the internet videos that demonstrate the efforts of others in this endeavor. We hope that you enjoy and gain an appreciation for the benefits of this techno-primitive solution.
This does not imply an endorsement, just sharing of fellow gardeners. Enjoy.
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