This resource describes the three levels of an energy audit, from a basic energy audit to an investment grade audit, based on the generally accepted ASHRAE standards.
The purpose of this subpart C is to implement HUD policies in support of national energy conservation goals by requiring PHAs to conduct energy audits and undertake certain cost-effective energy conservation measures.
Energy Audits: GreenGen's tips on what to look for in a high-quality audit and how to maximize your audit value.

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Although this standard is primarily focused on energy conservation measures and criteria, it does extend beyond these measures to address the building as a whole. The auditors role may vary depending on the context in which the audit is conducted.
Learn how to get a practical energy audit for your building, including what to expect, how to prepare, and what to look for in the report. This guide will help you save money, reduce your carbon footprint, and green your asset.

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Learn the best practices for conducting an energy audit and improve the energy efficiency of your building or facility.
By identifying air leaks, insulation gaps, inefficient systems, and performance issues, an energy audit reduces utility costs, improves comfort, and enhances indoor air quality.
A key component of an energy audit is to identify opportunities to improve energy efficiency. This is partly informed through the analysis of a propertys energy consumption profile and is complemented by general observation of equipment and operational practices.