Root Zone Heating for Greenhouse Crops is a technical guide published by ATTRA (Appropriate Technology Transfer for Rural Areas) that explains how root-zone heating systems can improve greenhouse productivity while significantly reducing energy consumption. Rather than heating the entire greenhouse air volume, these systems focus heat directly around plant roots, where temperature has the greatest impact on plant growth. The publication presents root-zone heating as an energy-efficient technology suitable for commercial greenhouses, homesteads, market gardens, and sustainable agriculture operations.
The guide explains that warm water is circulated through EPDM hydronic tubing or PVC piping installed beneath greenhouse benches or floors. By maintaining optimal root temperatures, growers can often lower greenhouse air temperatures by as much as 15°F while still maintaining excellent plant growth. Research cited in the publication indicates that root-zone heating systems may use only half the energy required by conventional greenhouse heating systems while achieving similar or improved crop performance.
A major emphasis is placed on alternative energy sources that can supply the warm water used in these systems. In addition to natural gas and fuel oil, the publication discusses geothermal energy, solar-heated water, compost heat, biomass heating, waste heat recovery, and cogeneration systems. Because root-zone heating operates effectively with relatively low water temperatures (approximately 90–110°F), it is particularly compatible with renewable energy systems.
The guide also serves as a resource directory, summarizing decades of greenhouse engineering research and pointing readers toward additional publications, case studies, suppliers, and technical resources. For preparedness-minded growers, the publication provides valuable insight into reducing greenhouse energy dependence while maintaining year-round food production.
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