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Solar and Biomass Root Zone Heating for Greenhouses Saves on Farm Energy Costs

Southern SARE reports on a grant-funded project that demonstrated how renewable energy and biomass-based greenhouse heating systems can cut farmers’ energy bills in half when integrated with a root zone heating system. Systems built for greenhouses on two farms in North Carolina utilized solar collectors to heat water for root zone heating, combined with biochar kiln backup systems. These systems cut propane heating costs for one greenhouse by half or more, while creating conditions for the other, passively heated, greenhouse to be used year-round.