ToddIs your operations and maintenance budget tight? Are you constantly fielding comfort complaints and fighting maintenance fires? SEDAC recommends retro-commissioning (RCx) to ensure that equipment and systems function as intended and operate at optimal efficiency. RCx helps buildings identify what needs to be repaired, tuned, or better maintained to meet needs and reduce energy costs.

Retro-commissioning offers significant energy cost savings at a relatively low cost, increases building comfort, and gives you peace of mind, knowing that the building will require fewer stressful service calls. 

Who we serve

Ameren Illinois customers. SEDAC offers Retro-commissioning (RCx) services for non-residential facilities (business and public sector) in Ameren Illinois territory. Learn more

All other facilities. We are happy to provide RCx services to other facilities for a fee. We can also direct you to available RCx services in your area. 

Get started

Fill out SEDAC's application to get started. We'll follow up within two business days to discuss next steps. 


Are you unsure whether RCx or an energy assessment would best meet your needs? Contact us. For questions about eligibility, the RCx application process, and other SEDAC services, please call 800.214.7954 or email

What does RCx entail? 

RCx is the systematic discovery, documentation, review, and improvement of energy operations through recommendations 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.

SEDAC 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. We work collaboratively with building staff and contractors to identify measures for correct and efficient energy systems operation. Through trend data analysis and functional testing, equipment faults and optimization opportunities are identified. We provide a report with costs, savings, and payback of our recommendations and provide assistance to help you implement our recommendations.

Learn more about RCx