The utility model provides a fan coil unit, which comprises a shell, a fan component, a heat exchange coil, a sensor, a setting device and a control device, wherein the shell is provided with an air return port and an air outlet; the fan component comprises a motor and at least one fan which is driven by the motor to rotate; the heat exchange coil can exchange heat with air sucked into the shell; the sensor is arranged at the air return port of the fan coil; the setting device is used for setting various parameters related to air to be adjusted; and the control device is arranged on the fan coil and comprises a microprocessor which can receive a signal from the sensor and adjust rotation speed of the fan based on comparison between the signal and the set parameters. According to the fan coil unit provided by the utility model, the rotation speed of the motor can be adjusted according to concentration of indoor carbon dioxide to adjust fresh air output while indoor temperature and humidity are controlled, so that indoor temperature, humidity and carbon dioxide concentration are controlled.
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