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An open-roof greenhouse production system with a heated ebb and flood floor irrigation system is being developed and evaluated. In addition to continuous roof vents, the greenhouse is equipped with sidewall vents to allow for ventilation during windy and rainy conditions. This paper discusses the design details as well as the instrumentation used for the evaluation. Preliminary data, collected over a 2.5-month period, of light and temperature conditions are presented. The greenhouse temperature closely followed outside temperature conditions for the entire measurement period when the inside temperature exceeded the set point. The inside light conditions were significantly affected by the greenhouse structure, and inside light intensities around solar noon could exceed outside light intensities due to reflection from the opened roof segments.