Abstract: A temperature controller for liquid chemical bubbler containers comprising a rectangular cabinet that is separated by an upright partition into a container receiving compartment at one side of the partition and a circuit components compartment at the other side of the partition. A thermoelectric heating and cooling apparatus is mounted in the container receiving compartment above the bottom of the housing and defines a fan chamber therebelow. An axial flow propeller fan is mounted below the heat sink on the thermoelectric device and is arranged to deliver a portion of its air discharge to the heat sink for cooling the same and to deliver another protion of its air discharge to the circuit components compartment for cooling the circuit components therein.