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Thanks tweva. Yes I had problems with tomatoes. The leaves yellowed and the tomatoes were small. It was getting over 100 degrees in there and so just too hot. Tomorrow I have to go in to the office, which is south of here down in MA, and I will ask the Facilities guy what % shade cloth he uses at the company. One of the buildings is essentially a 70′ high greenhouse that serves as a passive heating system for the offices in it. So as to reduce the air conditioning costs they have a shade cloth on it all summer.