When an air conditioner is set to the "fan" mode, it does not cool or heat the air. Instead, it operates solely to circulate the air already present in the room or space. The fan mode does not draw in air from the outside; rather, it takes the indoor air and circulates it throughout the room, helping to maintain a consistent temperature and reduce any stagnant feeling in the environment.
The fan mode is particularly useful when you don't need cooling or heating but still want to enhance air circulation. It can be helpful for creating a gentle breeze, distributing conditioned air from other parts of the room, or promoting better overall air movement. Additionally, running the fan alone consumes significantly less energy compared to running the cooling or heating function.