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Marilyn and Neal, Thanks for your ideas. I have seen large drums of water used in greenhouses before but have never heard of using a hologram to filter out infrared rays. Can you refer me to a website for more information? Thanks again, Arlene CHINAGRVE@aol.com wrote: > I live in New Mexico and 50 gallon drums of water in the greenhouse work great to keep the temp even. They heat in the > winter and cool in the summer. > Marilyn Conway CAVM@aol.com wrote:
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