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The function of a duct heater is to provide heat through electric elements installed within ductwork. This heating method is especially useful in HVAC systems for delivering warm air directly to the space being conditioned. The electric elements within the duct heater heat the air as it passes through, which then gets distributed throughout the building via the ductwork, ensuring a consistent and controlled temperature.

This method is commonly used in scenarios where additional heating is needed, such as in commercial buildings or during colder seasons when a standard heating system may not be sufficient on its own. By utilizing electric elements, duct heaters can quickly raise the temperature of the air in the ducts, making them an efficient solution for heating specific areas of a structure.