Abstract: Methods and systems for cooling plant roots in an aeroponics unit are disclosed. One such system includes a growing unit coupleable to a mist generator for delivering a mist within the growing unit. The growing unit includes two opposing side walls connected by a top wall, a base, a front wall and a back wall with plant receptacles on the front wall. A lower opening in one of the opposing side walls, the back wall, the front wall, or the base and an upper opening in one of the opposing side walls, the back wall, the front wall, or the top wall are shaped and positioned to allow a root cooling convection air current to form between the lower opening and the upper opening to cool plant roots by allowing ambient air to enter the enclosure through the lower opening and warmer air to exit through the upper opening.