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Solar Greenhouses greenhouse plans at end of articleCalling a greenhouse solar is somewhat redundant, since all greenhouses are solar heated to some extent. The greenhouse itself traps the heat each day, as anyone who has been inside a greenhouse for just a few minutes on a sunny day knows. Although a traditional greenhouse acts as a natural solar collector on sunny days, it does not retain the suns heat at night. Consequently, 75 to 80 percent of the cost of heating a greenhouse by conventional energy sources is expended at night.
via Free Solar Greenhouse Plans.
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