Final answer:
A Level 4 audit is an on-site evaluation by a certified auditor who conducts a detailed inspection and analysis of a facility's energy profile to identify areas for improved efficiency.
Step-by-step explanation:
The student has asked for a description of a 'Level 4 audit' which refers to an on-site evaluation conducted by an experienced energy advisor. This type of evaluation is detailed and comprehensive. A Level 4 audit involves a certified auditor performing a thorough inspection of the facility, which includes looking at the physical components of the building as well as operational practices. This audit is much more than a simple review of utility bills; it consists of a hands-on examination to identify opportunities for energy savings through improved efficiency. The auditor also analyzes historical energy usage to understand the facility's energy profile. Unlike remote assessments or homeowner self-assessments, the on-site Level 4 audit ensures a tailored approach based on actual conditions and use, leading to more accurate recommendations for energy savings.