Controller for air conditioner

A controller for an air conditioner that performs air-conditioning according to room temperature, the controller comprising:

• a housing;
• a heat source temperature sensor disposed inside the housing, the heat source temperature sensor being configured to measure a temperature of a heat source that generates heat during operation as a heat source temperature;
• an internal temperature sensor disposed inside the housing at a position away from the heat source, the internal temperature sensor being configured to measure a temperature inside the housing as an internal temperature;
• and
• a control unit that controls the air conditioner according to the room temperature of a room which the housing is disposed,
• wherein the control unit determines a correction value using a temperature difference between a heat source temperature measured at a predetermined calibration period after power on and the internal temperature, corrects a heat source temperature used when determining an amount of increase in the internal temperature using the correct value, determines the amount of increase in the internal temperature caused by an influence of heat generated by the heat source relative to the room temperature using a temperature difference between the corrected heat source temperature and the internal temperature, and determines the room temperature using the determined amount of increase.