A location with good summer breezes and plenty of space between houses is needed. Both manual and motorized systems are available. Growers with high tunnels have found that roll-up sides work well for warm season natural ventilation. With thermostatic control, this was, and still is, the accepted method for cooling many structures where positive air movement is needed. Engineers then came up with the concept of using fans that draw outside air through louvers in one endwall and exhaust it out the opposite end. When polyethylene was developed, with large sheets covering the whole roof, placing vents on the roof proved difficult. All greenhouses built prior to the 1950’s had some form of vents or louvers that were opened to allow the excess heat to escape and cooler outside air to enter. The concept of cooling a greenhouse with thermal buoyancy and wind goes back to the beginning of controlled environment. Here are a few pointers that will help you improve your system. ![]() Regardless of whether a grower uses fans or “natural ventilation,” it is important to make sure that the system is designed properly and working well. Good temperature control is vital for a productive high tunnel greenhouse, and this in turn means that the ventilation system needs to be effective and efficient.
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