A three year study has determined that using venting and fogging fans is a far superior way to control the temperature and humidity of a greenhouse as opposed to using the standard evaporative cooling wall. The benefits to using this system are many. Primarily less electricity and water are used in the process of cooling the space. Additionally more consistent temperatures throughout the greenhouse are maintained and there is huge redundancy built into the system.
If something goes wrong with your evaporative cooling wall, the whole greenhouse is in danger. If a single fogging fan fails you still have many others that can simply be run a bit longer and keep your plants healthy until a replacement fan can be installed.