An energy audit is an inspection, survey and analysis of energy flow into a building. It is a process or system used to determine and reduce the amount of energy input into the building’s systems without negatively affecting the output.

When the object of study is occupied building, then reducing energy consumption while maintaining or improving human comfort are of primary concern. Beyond simply identifying the sources of energy use or misuse, an energy audit seeks to prioritize the energy uses according to the greatest to least cost effective opportunities for energy savings. In other words, paying for an energy audit today helps you prevent avoidable waste and therefore saves you a lot in the long run.