Congratulations on your greenhouse! Unfortunately, I had already ordered a Janssen thru Sam's by the time I had discovered Harbor Freight's website. I was told that I might need glass vs. poly panels because of my climate. If you want to be sure your greenhouse is insulated well, you might consider having a concrete base poured to serve as your foundation. It also will give additional head room. My concrete form will be dry in 2 more days and then begins the long arduous task of putting this booger together.
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