A fan coil is a type of heating and cooling device commonly used in HVAC systems. It consists of a fan and a coil that circulates water or refrigerant to transfer heat. When the fan blows air over the coil, it either heats or cools the air, depending on the system's operation. Fan coils can be found in various settings, including residential, commercial, and industrial buildings. These units are often installed in ceilings, walls, or floors and can be controlled individually for different rooms. They are efficient and provide a comfortable indoor climate by allowing for precise temperature control. Fan coils are an essential component of systems like central heating and air conditioning.