Public Library Retro-Commissioning (RCx) Success

In August 2024, an Indiana county’s public library worked with Michaels Energy through the Duke Energy Retro-Commissioning (RCx) Find-and-Fix program to identify opportunities to improve building performance and comfort while reducing energy consumption. The Michaels team identified a series of low-cost operational enhancements targeting air-handling units, chilled water systems, and building schedules, which the library implemented. These improvements resulted in significant verified annual energy savings and long-term cost reductions—without major capital investment.

Find-and-Fix Study Results

A review of the library’s building automation system revealed opportunities across common controls. Prior to implementation, air-handling units operated with fixed setpoints, limited scheduling, and no optimization for outside air conditions. Additionally, inconsistent temperature setpoints and static pressure levels contributed to unnecessary heating and cooling loads. The Find-and-Fix study identified actionable measures that could be implemented quickly for little to no cost.

Implemented Measures & Impact

After the Find-and-Fix study was completed, the library implemented five of the recommended Energy Management Improvements (EMIs), which included:

• Improved HVAC Scheduling: Reducing weekly HVAC operating schedule by 28 hours, and supplementing holiday schedule by adding two previously unaccounted for holidays.
• Static Pressure Reset for Air Handling Units: Transitioning to a new static pressure reset sequence based on VAV damper positions.
• Temperature Adjustments: Standardizing occupied setpoints to 69°F heating / 74°F cooling.
• Cooling Optimization: Implementing chilled water and condenser water reset sequences based on outdoor air temperature.
• Economizer Setpoint Adjustment: Raising fixed dry-bulb economizer setpoint from 56°F to 62°F.

Total Verified Impact

• Annual Cost Savings: $24,320
• Lifetime Cost Savings: $170,240
• Energy Savings: 270,310 kWh
• Carbon Reduction: 282,700 lbs CO₂e

Michaels also identified potential for future savings by implementing optimal start sequences for AHUs and VAVs, which could provide the library $860 more in annual savings and reduce an additional 9,600 kWh.

The library’s participation in the Duke Energy RCx Find-and-Fix program demonstrates how thoughtful improvements can yield substantial energy and cost savings. By focusing on low-cost optimization measures, the library reduced operational waste and enhanced occupant comfort while setting the stage for continued performance improvements.