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as I recall , the underground house book circa 1970s says build a 12inx12in tunnel 100 ft long below the frost line and pull the house air through it,that should cool a 1000 sq ft home to 57* winter preheat or summer cooling you can use the same 20in fan and save all the complication of radiators and water,tubing etc. . It may be a good use for your new toybota
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