This is a passive solar greenhouse.  The greenhouse does not need electricity or gas to heat.  Only the sun is used to stay above freezing even when it is single digits outside.  It has several automated features which are optional. 

For those on the greenhouse tour, here is some information about the solar panels on our house.  We have 6 panels at 240 watts each or 1,440 watts total.


Greenhouse construction

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This is a Quicktime movie of a class I taught on hobby passive-solar greenhouses at Thanksgiving Point.