An energy saving apparatus includes at least a planting rack having at least a panel and a collecting part, a wind pipe, an air conditioner, and an air blower. The panel further has a flow path, and the collecting part is located at a bottom of the panel communicative with the flow path. The wind pipe with bottom nozzles is located above the panel. The air conditioner coupled to the wind pipe is to spray a cool air to the panel through the nozzles. The air blower coupled between the collecting part and the air conditioner is to extract air, so that the cool air can flow from the top to the bottom of the panel, then flow down along the flow path to the collecting part, and finally be supplied back to the air blower for further recycling the cool air to the air conditioner.
