Energy Audits & Retro-Commissioning · Every 10 years
LL87 requires covered buildings to conduct an ASHRAE Level II energy audit and a retro-commissioning study once per decade, then file an Energy Efficiency Report (EER) with the Department of Buildings.
What the audit covers
An ASHRAE Level II audit is a systematic walkthrough of every major energy system — envelope, HVAC, DHW, lighting, controls, motors, and plug loads — with measurement, financial analysis, and prioritized ECMs.
- Base year energy accounting reconciled to LL84
- System-by-system efficiency assessment
- Financial analysis (SPB, NPV, IRR) for each ECM
- Peak load and demand profile analysis
Retro-commissioning
Retro-Cx verifies that installed systems still operate as designed. Most buildings recover 5–15% energy savings from RCx alone — the highest ROI compliance activity available.
- Functional testing of HVAC and BMS sequences
- Sensor calibration and setpoint review
- Corrective measures with measured verification
- Master List of Findings and Corrective Actions
How LL87 connects to LL97
LL87 audit ECMs feed directly into LL97 decarbonization roadmaps. When executed together, one field mobilization satisfies both regulatory obligations and produces an actionable capital plan.