What is one common method for achieving energy efficiency in commercial HVAC systems?

Utilizing variable air volume (VAV) systems to adjust airflow based on occupancy is a well-recognized method for enhancing energy efficiency in commercial HVAC systems. VAV systems optimize the amount of conditioned air supplied to different areas of a building depending on the current occupancy and demand in those spaces. By varying the airflow, these systems reduce energy consumption and maintain comfort conditions more effectively. This adaptability prevents the wasted energy that would occur with fixed airflow systems operating at a constant rate, regardless of how many occupants are present or how much heating or cooling is actually needed at any given time.

In contrast, other choices do not align with energy-efficient practices. Single-zone HVAC systems typically provide uniform heating or cooling throughout a space, which is not as efficient as systems that can adjust based on needs. Operating all HVAC units at full capacity disregards the fact that energy can be wasted when demand is lower than the system's output. Lastly, installing oversized air handlers can lead to short cycling and increased wear on the system, ultimately resulting in higher energy usage and maintenance costs. Therefore, VAV systems represent a more modern and efficient approach to managing indoor climate in commercial settings.