If you look back thru some of the old threads you'll find all kinds of ideas, underground, sunken, and reused material. There is a thread that includes all kinds of improvements to a relatively inexpensive Harbor Freight Green House. The thread "Harbor Freight Greenhouse projects" in Greenhouses forum Even if you're not investing in one the ideas are there to adapt as you may. You may get by with something as simple as a lean-to with removable ends to control summer heat. 
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