Which system is considered a forced air system?

A forced air system is one that uses a fan to circulate heated or cooled air throughout a space. Central heating and cooling systems utilize this method by heating or cooling air in a central unit, which is then distributed via ducts throughout the building. This system allows for efficient regulation of temperature and can be integrated with various components such as filters, humidifiers, and dehumidifiers, enhancing indoor air quality and comfort.

In contrast, baseboard heating relies on convection and does not use forced air; it heats the air passively by allowing it to rise naturally. Radiant heating operates by warming surfaces directly, such as floors or walls, without circulating air. Heated water systems, like hydronic systems, utilize water heated by a boiler but do not force air through ducts.

The characteristics of forced air systems make them particularly versatile for heating and cooling, enabling adjustments for different zones within a home or building. This flexibility and the ability to improve indoor air quality are key distinctions that highlight why central heating and cooling systems qualify as forced air systems.