How do occupancy sensors in HVAC systems improve efficiency?

Occupancy sensors in HVAC systems contribute to energy efficiency by adjusting heating and cooling based on the presence or absence of people in a space. When these sensors detect that a room is unoccupied, they can reduce or completely shut off heating or cooling, minimizing energy waste. Conversely, when occupancy is detected, the system can increase heating or cooling to maintain a comfortable environment. This targeted approach helps ensure that energy is only used when necessary, leading to significant reductions in overall energy consumption and associated costs.

Other options do not align with the primary function of occupancy sensors in HVAC systems. Operating at full capacity at all times would lead to unnecessary energy consumption without regard to actual need. Focusing on outdoor air quality is not a function of occupancy sensors, as they primarily manage indoor environmental conditions based on presence. Reducing lighting usage alone does not address the heating and cooling aspects of HVAC systems directly. Thus, the ability to adjust heating and cooling depending on room occupancy is what makes the use of occupancy sensors an important strategy for increasing efficiency in HVAC systems.