means 36 decreasing to zero which de activates switch means 24 to the 34 off 34 or non conducting condition during the conduction of current through the one or more tec devices 18 inductor means 20 charges up and retains energy and when the switch means 24 is de activated the inductor means 20 discharges the retained energy thereby filtering and smoothing the dc current through the one or more tec devices 18 and providing some current stability through the one or more tec devices as the temperature of the one or more tec devices 18 and the heat exchanger 30 increases above the 34 set point 34 temperature the signal from temperature sensor 28 will indicate this rise in temperature to the programmable control means 34 the output signal from the programmable control means 34 to the non inverting input of comparator means 36 will be increased from six 6 volts to twelve 12 volts which will result in the output signal from the comparator means 36 to switch means 24 to increase to twelve 12 volts switch means 24 will be placed in the 34 on 34 or conducting condition and current will flow through the one or more tec devices 18 to bring the temperature back down.