What is the purpose of a heating coil?

The purpose of a heating coil is to add heat to the air. Heating coils operate by transferring thermal energy to the air that passes over or through them, effectively raising the temperature of that air. This process is essential in a variety of heating systems, particularly in forced air systems where the heated air is distributed throughout a building to maintain a comfortable environment.

When heated air is introduced into living or working spaces, it helps to achieve adequate thermal comfort, especially in cold weather conditions. Heating coils can be powered by electricity, hot water, or steam, depending on the system design and energy sources available.

The other options address different functions; for instance, removing moisture from the air relates to dehumidification, which is not the primary role of a heating coil. Recycling air might pertain to ventilation systems rather than directly heating, and cooling air is contrary to the function of a heating coil, as its design and operation are specifically intended to increase air temperature rather than decrease it.