Once you have benchmarked your building using a tool like ENERGY STAR Portfolio Manager, the next step to improving the energy performance of your property is to conduct a comprehensive energy audit. Energy audits, also known as energy assessments, can identify energy-saving opportunities in your building, such as lighting, heating, air conditioning, windows, insulation, and more. An energy assessment will show you exactly how and where energy is being used in your building, and specific steps you can take to limit energy waste. The industry standard for energy audits is the ASHRAE Energy Audit. ASHRAE offers three levels of energy audits with increasing depth of analysis. This guide will explain the differences between each audit level.