Lexus Engineering conducts Energy Audits (aka Energy Assessments) as per ASHRAE’s "Procedures for Commercial Building Energy Audits". We work closely with the building owner and other stakeholders to determine the best course of action for the client.

A commercial building energy audit is classified into the following three levels of effort:

• Level 1: Walk-Through Analysis
• Level 2: Energy Survey Analysis
• Level 3: Detailed Analysis of Capital Intensive Modifications

We also conduct Targeted Audits, which have a limited scope, typically a single energy-using system, central plant, or area of the building. Some examples include lighting-only audits, boiler system audits, or electrical motor performance audits.

Regardless of the level of audit, a Preliminary Energy-Use Analysis (PEA) is required as the starting point. A minimum of 1 year of utility bills (preferably 2 or 3 years) is analyzed to determine the Energy Cost Index (ECI) and the Energy Utilization Index (EUI). The EUI is compared to similar buildings to assess the potential for improved energy performance and to determine whether further engineering study and analyses are likely to produce significant energy savings.

Relationships of ASHRAE Energy Audit Levels 1, 2, and 3