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What material would I want to use to build the walls, and ceiling of for a 4 season greenhouse around the 45N,93W (4a)?

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    I assume 45N is a latitude. What would help is the temperature range, what you intend to grow, how large a greenhouse, access to water, what surface do you intend? earth, paving slabs, poured concrete? Without this information I think this question will be closed as "Too broad"
    – kevinskio
    Mar 22 '16 at 9:48
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    Relatively cheap, ultraviolet stabilized plastic greenhouse film. Relatively permanent, double-wall polycarbonate panels. Standard polyethylene only lasts a season so don't bother. Mar 22 '16 at 15:41
  • I'm thinking about using natural sunlight to reduce the requirements for the amount of power needed to have the plants grow cheaper for INDUSTRIAL!!!!!!! aquaponic growing of many different types of plants year round. Mar 22 '16 at 21:32
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    If you're investing heavily in infrastructure, you don't want to rely on natural lighting, but use grow lights instead so that you can grow all year round. Mar 23 '16 at 7:06
  • @kevinsky is right. We need most of the details he mentions. 45 degrees North latitude could mean anything from the Rocky Mountains in Montana to somewhere in Central France. Both the same latitude, but your growing conditions vary extremely.
    – GardenerJ
    Mar 23 '16 at 15:11

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