Geothermal Loop Length

Estimated loop length from design BTU and BTU-per-foot benchmarks (simplified).

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Formula and source

Required loop length = peak design BTU/hr (max of heating, cooling) / BTU-per-foot benchmark from soil-class lookup (vertical / horizontal × dry / moist / saturated soil).

DOE / IGSHPA technical reports by name (U.S. government, public domain).

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