Which component of an HVAC system allows for varying air volumes to be supplied across different zones for tailored heating and cooling?

The correct response is centered around the role of VAV (Variable Air Volume) boxes in an HVAC system. VAV boxes are specifically designed to regulate and control the airflow within different zones of a building. They adjust the volume of air delivered to each zone based on the heating or cooling needs of that area. This dynamic adjustment allows for a more efficient and comfortable climate control within various zones, resulting in energy savings and enhanced comfort for occupants.

In contrast, terminal units refer generally to devices that distribute air, but they do not inherently manage variable air volumes in the same way that VAV boxes do. Chillers are used primarily for cooling, as they produce chilled water for air conditioning systems, and boilers serve to heat water or produce steam for heating purposes. Neither of these components deals directly with the distribution of variable air volumes across different zones, which is the key function of VAV boxes.