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We had a similar RedR TSS inquiry about 2004 for a document building in East Timor. Simply you can dig a hole to about 1.5 or 2 m where the ground temperature is stable. Infill with clean regular sized large boulders for heat mass, but still with air flow. Then using a low power or convection system air is drawn / forced to the bottom of pit and stabilised and then drawn off at the top of pit. An old document "the Owner Built Home" circa 1972 by Ken Kern describes in more detail. Hope this assists.