Claim: Grow box can be soil-based, the most sophisticated examples are enclosed, and the some of them have air conditioning.
Evidence: Grow boxes may be soil-based or hydroponic. The most sophisticated examples are totally enclosed, and contain a built-in grow light, intake and exhaust fan system for ventilation, hydroponics system that waters the plants with nutrient-rich solution, and an odor control filter. Some advanced grow box units even include air conditioning to keep running temperatures down, as well as CO 2 to boost the plant's growth rate.