Hot air escapes at the highest point in the Zephyr greenhouse, not at the lower gutter area, as in a gutter-vented design. Top ridge vents allow for dehumidification even when snow is in the gutters. The combination of the Zephyr vertical ridge vent and side/endwall vents eliminates the need for exhaust fans and reduces dependence on high cost electricity. Grower experience in this house indicates the ability to hold outside ambient temperature in the greenhouse without use of mechanical cooling.
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