Re-tuning is a systematic process aimed at minimizing building energy consumption by identifying and correcting operational problems that plague buildings at no-cost or low-cost. Re-tuning relies on building automation system data to identify and implement control improvements at no cost other than the time to program the changes.

These low-cost or no-cost operational improvements ultimately improve the buildings' energy efficiency, reduce operating costs, and improve occupant comfort.

An active energy management program utilizes many practices to reduce energy use. Re-tuning is one practice that has been verified to produce energy savings ranging from 5% to 25% in federal sites. Re-tuning is an effective, low-cost and relatively easy method for reducing building energy use primarily accomplished through the building automation system controls.

The primary steps of re-tuning include:

1. Basic building information collection
2. Trend-data collection and analysis
3. Building walk down
4. Identify and implement re-tuning actions
5. Report findings and recommended actions and implementations
6. Analyze savings
7. Continued use of re-tuning in operation and maintenance.

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