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Another option to think about is evaporative cooling using "cool cells" My grandparents own commercial greenhouses in iowa and they keep their greenhouses around 75-80 year round with no air conditioning. They have been using the same method for years. I believe you still have to dig a big hole for the resovoir of water to sit in. If you want I can ask them for some information on it. My uncle runs them now and he built most of them.
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