A greenhouse is disclosed having a light-transmitting barrier and a floor surface. The barrier and floor surface are connected to define an enclosure within the greenhouse for plant cultivation. The barrier includes an inner layer delimiting the enclosure and an outer layer. The inner and outer layers are impermeable to air to substantially prevent air from entering the enclosure through the inner layer. The outer layer is spaced apart above the inner layer to define an air passage therebetween. The air passage is in fluid communication with at least one air inlet in a bottom portion of the outer layer and with an air outlet in a top portion of the outer layer. Air within the air passage flows passively from the at least one air inlet to the air outlet upon being heated.