PURPOSE: To secure comfortable cooling temperature as well as to make a trip by train ever so comfortable enough, by making the setting value of the cooling temperature alterable by operation of passengers themselves with a nearby switch.

CONSTITUTION: In the case where you want to increase room temperature as you feels the cold, more than each one spot of temperature-up switches 5a1, 5a2,... in an A system and temperature-up switches 5b1, 5b2,... in a B system are operated and if so, a relay 8 is excited from a power line 1 through these switches 5a1 and 5a2 (suppose these two switches are operated), and its auxiliary contact 8a comes to be on so that it is connected to a cooling control circuit through an auxiliary contact 7b2 and a thermostat 4 being high in the temperature setting value. At this time, since auxiliary contacts 8b1 and 8b2 come to be on simultaneously, each circuit of thermostats 2 and 3 is opened whereby cooling temperature is controlled by the thermostat 4 alone. In the case where you want to reduce the temperature, a relay 7 is excited by operation of temperature-down switches 6a1, 6b1... in both A and B systems, and cooling temperature is controlled by the thermostat 3 alone.