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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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