Word Count : 238

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Direct gain heating and cooling in solar passive buildings refers to the use of sunlight to naturally heat and cool a building without relying on mechanical systems or external energy sources. In this approach, sunlight enters the building through south-facing windows or other strategically placed openings, directly warming the interior spaces. The heat is absorbed by materials such as _________ _________ _____ ________ __________ _______ _____.
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