What is supply and return?

Supply and return refer to the two main airflow processes in heating, ventilation, and air conditioning (HVAC) systems. The supply system delivers conditioned air (heated or cooled) into a space, while the return system extracts stale air back to the HVAC unit for reconditioning. This cycle helps maintain indoor air quality and comfort by ensuring a continuous flow of fresh air. Properly balanced supply and return systems are essential for optimal HVAC performance and energy efficiency.