What is the largest portion of energy usage typically attributed to in a building?

In a typical building, the largest portion of energy usage is usually attributed to HVAC systems (Heating, Ventilation, and Air Conditioning). HVAC encompasses the heating and cooling of spaces and is crucial for maintaining indoor climate and comfort levels. The demand for heating and cooling is significantly influenced by factors such as climate, building design, and occupancy patterns.

While lighting and appliances are essential components of energy use, HVAC systems generally account for a larger share of total energy consumption, especially in commercial buildings and climates where heating and cooling demands are pronounced. Understanding the energy consumption patterns in buildings is crucial for developing effective energy management practices and improving energy efficiency measures.