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Another thing worth considering is simple black PVC tubing with a 90* elbow penetrating a wall near the floor, then another penetrating near the ceiling. Takes quite a few of them to make reasonable heat flow, but in direct sunlight they can do a heck of a job.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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