Forced air systems are heating and cooling systems that use a fan to distribute air throughout a building. These systems typically consist of a furnace or air conditioner, ductwork, and vents. The furnace heats the air, while the air conditioner cools it, and the fan pushes the conditioned air into different rooms. These systems are popular for their efficiency and ability to quickly change the temperature in a space. They can also be equipped with filters to improve indoor air quality by removing dust and allergens. Regular maintenance is essential to ensure optimal performance and longevity of the system.