Abstract: A rack for a compost bed (13) includes a rack bottom (1), a carrier (11) which is supported with respect to the rack bottom for the compost bed and a liquid device (10) provided with a liquid supply (20) and a liquid discharge (21) via which a liquid can be passed in order to heat and/or cool the compost bed on the carrier. The liquid device (10) includes at least one flat plate (14), one side of which faces the carrier (11) and the other side of which is directly connected to a liquid-carrying duct and/or which other side delimits a liquid-carrying duct (17), which liquid-carrying duct is connected to the liquid supply (20) and the liquid discharge (21). By element of such a plate-shaped liquid device, the compost bed can be heated or cooled evenly. In addition, aeration pipes (7) are provided for aerating the compost bed.