The HVAC FCU, or Heating, Ventilation, and Air Conditioning Fan Coil Unit, is a critical component of a building’s HVAC system. It is responsible for providing heating and cooling to the interior of a building, as well as controlling the air flow and temperature. The FCU is typically located in the ceiling or on the wall, and consists of a fan, motor, and heat exchanger. The fan is responsible for circulating air throughout the building, while the motor powers the fan and the heat exchanger is responsible for heating or cooling the air. The FCU is controlled by a thermostat, which is used to set the desired temperature. The FCU is an essential part of any HVAC system, as it helps to ensure that the building’s interior is comfortable and that the air quality is maintained. It is important to ensure that the FCU is properly maintained and serviced, as it can be a major source of energy loss if not properly maintained.