Temperature detecting device and air conditioner

An air conditioning system comprising:

• an air conditioner comprising a detection camera and a controller electrically connected to the detection camera;
• a temperature detecting device separate from the air conditioner, comprising:
• a temperature detector utilized to generate a temperature distribution result of the specific area;
• and
• a visual indicator electrically connected to the temperature detector and disposed on an outside surface of the temperature detector and adapted to be directional guidance for providing a plurality of visual marks respectively indicating different position information of at least one heat source and being detected by the detection camera of the air conditioner;
• wherein the plurality of visual marks comprises directions pointing toward a left side and toward a right side of the temperature detecting device to indicate position relation between the at least one heat source and the air conditioner, and one of the plurality of visual marks is enabled to emit light according to the temperature distribution result;
• wherein the detection camera is configured to detect the plurality of visual marks on the visual indicator such that the controller controls the air conditioner based upon the detected visual marks.