Described herein is an indoor greenhouse that includes a rack unit, an outer layer that surrounds the rack unit and defines a greenhouse interior, at least one light surrounded by a light enclosure, a cooling system, and a ventilation system all disposed in the greenhouse interior. The ventilation system includes a fan, a filter and at least one duct that cooperate to exhaust air out of the exhaust vent opening. The rack unit includes a top, a bottom, and an intermediate portion extending therebetween. The outer layer includes a top, a bottom, and an intermediate portion extending therebetween that correspond to the similar portions of the rack unit. The outer layer also has intake and exhaust vent and light cooling openings defined therein. The cooling system includes at least one duct that cooperates with the light enclosure to define an air path between the intake and exhaust light cooling openings.