Neb - I check out the Harbor Freight Greenhouse. Interesting structure. I also called Customer Service which was a guy in India (call center). The polycarbonate panels are only 4mm thick. Depending on where you live, that's really thin (3/16") and won't give you much insulation value. I would recommend 10mm. Yes, their a little more expensive, but you'll be thankful for that when it gets cold at night, unless you live in Phoenix or Miami.
I have a 10mm 8' x 14' x 7' 6" greenhouse and I live in Colorado. Keeps the plants warm at 10 above zero with a 10,000 BTU heater.
Anyway, good luck. You can email me at
chuckcory81621@yahoo.com if you'd like the source for the greenhouse I have. It's really great!
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