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A Fan Coil Unit (FCU) is a simple device consisting of a heating and/or cooling heat exchanger or 'coil' and fan. It is part of an HVAC system found in residential, commercial, and industrial buildings. A fan coil unit is a diverse device sometimes using ductwork, and is used to control the temperature in the space where it is installed, or serve multiple spaces.
Best Answer: Fan coils are what they sound like. A fan blowing air over a coil. There can be one or two coils-one for heating & one for cooling. Often, an office building can have just cooling on the inside, while areas on the permimeter & top floor need the heating.est Answer: Fan coils are what they sound like. A fan blowing air over a coil. There can be one or two coils-one for heating & one for cooling. Often, an office building can have just cooling on the inside, while areas on the permimeter & top floor need the heating.