The distinction between active and passive solar greenhouses hinges on their heating mechanisms: passive greenhouses maximize heat from natural sunlight using design techniques like proper orientation, thermal mass, and specialized insulation, aiming for self-sufficiency without external energy inputs. In contrast, active greenhouses employ mechanical systems like solar thermal collectors and fans to regulate temperature, offering precise control but at the cost of complexity and higher operational energy. He would likely suggest that while active systems provide more consistent conditions, passive designs are typically more sustainable and economical, aligning with permaculture principles.
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