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Solar Greenhouse Covering Night Heat Retention
   
The south-facing glass loses a tremendous amount of heat compared to the other three-fourths of the building's surface that are insulated. What is needed is a good nighttime heat barrier for the window doesn't have to be a great insulator, but it must be durable and easy to maneuver, since it will get heavy use.
More important, the material should be reflective on the inside and fitted tightly at the edges to stop air flow. A reflective material (aluminum paint or foil) will block all escaping radiant energy. Combined with an airtight seal, that seems to do plenty for me greenhouse. Beyond that, any insulating value you can build into the curtain is so much the better.
Those are the basics of a solar greenhouse: the sun-catching design, strategically placed insulation, and heat storage. Together they make a cool-weather garden possible even in Northern states. The air inside should average 40+ degrees higher than outside and between 45 and 55 degrees F. in the soil throughout the winter. Many vegetables will thrive in that temperature range.
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Gardening Tips Garden Tools Spring Planting Organic Gardening The Western Garden Book Solar Greenhouse Basic Construction Now on to Keeping Heat constant Solar Greenhouse Covering VEGETABLE GROWING IN THE SOLAR GREENHOUSE Root Cellar Storage Poisonous Plants Greenhouse Location Greenhouse Construction Greenhouse Temperature Control Greenhouse Soil or Hydroponic Culture Carbon Dioxide and Pest Management Greenhouse Tomato Planting Greenhouse Plant Training Green House Carbon Dioxide Enhancement Greenhouse Integrated Pest Management Green House Diseases Green House Insects
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