Ideal temperatures are between 68 and 70 F. High temperatures may cause plants to become stunted, and if the water temperature gets too high, it may lead to root rot.
Your grow room should also have an ample supply of carbon dioxide (CO2). The best way to ensure this is by making sure the room has a constant flow of air. More
advanced hydroponic gardeners may supplement CO2 levels in the room, since the more CO2 available, the faster your plants will grow.
It’s very important that a hydroponic system is set up in the right conditions. Key elements include relative humidity, temperature, CO2 levels, and air circulation. The ideal humidity for a hydroponic grow room is from 40 to 60 percent relative humidity. Higher humidity levels—especially in rooms with poor air circulation—can lead to powdery mildew and other fungal problems.