retrocommissioning photoRetro-commissioning (RCx) is the systematic discovery, documentation, review, and improvement of energy operations through NO-COST OR LOW-COST SAVINGS OPPORTUNITIES (repair, adjustment, control) that match building performance to current functional requirements. Retro-commissioning offers guidance and analysis to improve the energy performance of your building by FOCUSING PRIMARILY ON HVAC (heating, ventilating, and air conditioning systems).  In addition to saving energy, RCx recommendations can contribute to longer equipment life, lower maintenance costs, and fewer comfort complaints

RCx establishes a collaborative partnership between building stakeholders and the RCx provider for investigation and optimization of building operations.  RCx service providers work collaboratively with building staff and contractors to determine measures for correct and efficient energy systems operation. Through trend data analysis and functional testing, equipment faults and optimization opportunities are identified.


The RCx provider conducts a facility assessment to diagnose problems and make recommendations for minor low-cost adjustments that can be made quickly, as well as recommendations for more substantial improvements. An assessment of cost, savings, and payback is part of the process. The RCx provider will then work with the customer’s implementation team to fully investigate, implement, and verify the recommended measures.

Become a RCx Service Provider

Are you an experienced RCx provider? Want to participate in our program? SEDAC invites interested architects and engineers experienced in retro-commissioning to become pre-qualified RCx Service Provider by completing the Request for Qualifications (RFQ). Learn more.

View list of pre-qualified Retro-Commissioning Service Providers

For More Information

To learn more about RCx Program, determine eligibility, or to find out how to apply, please call 312.267.2865 or email

Links To Retro-Commissioning Documents