Stephen,
You may want to contact Jerome Osentowski through his website,
http://crmpi.org
He's been building and living with innovative solar greenhouses, heated by his
brilliant "thermal battery" for a couple of decades. He knows a lot about
what structures work. And a browse around his site will give you some idea of how the
thermal battery can reduce daytime high temps and use that heat to raise nighttime
lows, if you aren't already familiar with them. If you contact him, I'm sure he'll be
happy to help. He's writing a book about these greenhouses, too.
Toby
http://patternliteracy.com
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