and 73 are connected to the manual set contacts 72b and 73b respectively the controlling units 27a 34a and 37a are supplied with the respective manual signals as external input signals vin while when the movable contacts 72c and 73c of the manual set switches 72 and 73 are connected to the automatic set contacts 72a and 73a respectively the controlling units 27a 34a and 37a are supplied with the heat load signal as an external input signal vin thus the driver or passengers may choose either manual or automatic control for controlling the air conditioning equipment fig3 a and 3 b show still another embodiment of air conditioning equipment which is provided with a blower control device in addition to the control signal output unit 82 the blower controlling device 31a controls the drive circuit 65a in cooperation with the actuator 50 to change the blower speed from high to middle middle to low low to middle and middle to high as the air mixing shutter 5 is turned from the cooling mode to the full heating mode as fig3 c shows the blower controlling device 31a is constructed in such a manner that the two conductive legs jb and jc of a u shaped member mounted on the back of a gear wheel ja of the gear train j of fig1 b is brought into contact with a common contact 31aa and a low speed.