What is the function of a fan coil unit in a hydronic system?

The primary function of a fan coil unit in a hydronic system is to transfer heat from the water to the air in a room. This is accomplished by circulating water that has been heated or cooled through a coil within the unit. As air from the room passes over the coil, heat is either released into the air (in heating mode) or absorbed from the air (in cooling mode), effectively modifying the temperature of the room.

This process is central to hydronic heating and cooling systems, making fan coil units crucial components for climate control in residential and commercial spaces. By harnessing the thermal energy of the water, fan coil units can efficiently regulate indoor temperatures, contributing to overall comfort.

Other functions listed, such as circulating water or filtering air, are not accurate for this specific component. The fan coil unit relies on the overall system's circulation for water movement, does not filter air on its own, and does not provide insulation.