The term ‘return air’ refers to air that is?

The term ‘return air’ specifically refers to air that is circulated back into the conditioned space within a building's HVAC system. This process is essential for maintaining a consistent temperature and air quality. When air is cooled or heated in an HVAC system, it is distributed throughout the space, and once it has been used, it does not merely exit the premises. Instead, that air is directed back to the equipment for reconditioning and redistribution, ensuring energy efficiency and comfort.

By returning air to the system, it allows for the continual recycling of air within an environment, which helps maintain a proper balance of temperature and humidity. This process also plays a significant role in filtering and conditioning the air before it is sent back into the living or working areas.