Level 2 Vs 3 Energy Audits


The costs and savings associated with audits and the complexity of energy analysis vary with the different Audit levels. A Level I audit is a simple walk-through analysis, while Audit Levels II and III tend to be more detailed in their data-gathering processes, equipment used and ECMs proposed.

Level II Audit (or Level 2: Energy Survey & Analysis)

A Level II Audit looks at all base building systems and examines how they use energy. It begins with a study of past energy bills and is followed by investigation of current performance. The energy audit report will include a breakdown of energy consumption and will outline the low- to no-cost measure that can be implemented to reduce energy use.

Level III Audit (or Level 3: Investment-Grade Technical Analysis)

A Level III Audit is the most detailed audit. It will provide a granular analysis of energy inputs and outputs in a building. In addition to base building systems, the building envelope will be examined to ensure efficient use of heating and cooling resources. As part of a Level III Audit, data logging equipment will be used to record temperature, humidity, and the hours of operation for the major building systems and equipment. ECMs will be identified and accompanied by an investment-grade cost analysis. Cost savings for ECMs will be determined using computer simulation. The ECMs will be assessed singularly and collectively to investigate the interactive effects of the measures and their dynamic effect on the building conditions using hourly weather data for a full calendar year.

Although Local Law 87 requires only an Energy Audit Level II to ensure compliance with the legislation, conducting a Level III investment-grade technical study can identify complex EEMs (energy efficiency measures) which lie beyond the scope and budget of a Level II analysis. By engaging in a Level III audit, buildings will realize the benefits of exactitude and precision in measuring whole-building energy usage as well as, higher savings from each capital-intensive measure proposed.

 

Table comparing Energy Audit Level I, Level II and Level III:

 

Level I Audit

Level II Audit

Level III Audit

Establish building area

x

x

x

Utility bill analysis

x

x

x

Building benchmarking

x

x

x

LL87 compliance

 

x

x

Analysis of base building systems

 

x

x

Breakdown of energy end use

 

x

x

Outline of low- to no-cost ECMs

 

x

x

Granular study of energy end use

 

 

x

Anaysis of capital intensive ECMs

 

 

x

Investment grade financial analysis

 

 

x

Computer simulation of ECMs

 

 

x

Data logging

 

 

x