Geothermal Greenhouses: Exploring the Potential

ATTRA/NCAT IP617 publication on active and passive ground-source geothermal systems for greenhouses/high tunnels (climate batteries, heat pumps); related earth-temperature strategy but not a pit walipini construction guide. Explains underground soil temperature stability starting roughly two feet below surface; page states underground soil averages ~55°F throughout the United States. Distinguishes active ground-source heat-pump systems vs passive earth-battery/climate-battery systems (fans + perforated underground piping charging soil). Discusses pairing climate batteries with passive solar greenhouses; notes high tunnels need good insulation for geothermal to be worthwhile. Before-you-build: avoid high water table / impermeable layers; maximize sunlight orientation; seal structures; ventilation still required.

RELATED BUT DISTINCT from walipini: focuses on ducted ground-air / heat-pump geothermal under or beside structures, not excavating the growing room as a pit greenhouse.

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