I am planning on a new greenhouse to cover my hydroponic outdoor system for tomatoes, peppers and eggplant. Construction is 1 1/2" PVC with a 10' eave and 14' peak (arched), 20' x 25' , anchored to 2x6 on sidewalls, staked in to ground. I am estimating 5000cfm airflow minimum and planning on 2 2500 cfm fans on one end, and 2 2'x4' louvers on the other end. The plant bases are 2' off ground, so I was planning on the louvers and fans at about 6-7' off ground. I have access to some industrial controls (thermocouples and temperature setpoint switch).
1. Will I also need internal air circulation? 2 small box fans in opposition center?
2. Do I just set the fans to heat level for cooling, or run constantly, or timer control (recommendations helpful)
3. Would I need evaporative cooling on the intake louvers?
Any other suggestions appreciated. Here's a pic of my system
