Retrocommissioning spans the spectrum from tweaking controls of the HVAC and lighting systems to physically analyzing the functionality of the mechanical systems. (Are the valves and dampers working? Are the systems piped correctly?). In the end, the building operates more smoothly, occupants are more comfortable, equipment maintenance problems are reduced, and the building owner saves money.


Determine if RCx is worth pursuing in your building and outline potential measures.


Further develop measures identified during Qualifying Phase and model their cost/savings.


Make the recommended changes in your building.


Ensure savings are being realized.

What are the Qualification steps?

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Want to know whether RCx is right for your building? Worried about how much this effort would cost? If your building is in Vermont, contact Efficiency Vermont to learn about their Retrocommissioning Program that Cx Associates helped to develop – the Qualifying Phase of an RCx Study may be available to you for FREE!

Retrocommissioning Program - Learn More


Retrocommissioning Experience

Cx Associates has expertise in retrocommissioning including system optimization, identification of energy efficiency measures and capital investments for long term energy reductions. Cx Associates Principal Emeritus Tom Anderson was a contributing author to the Building Commissioning Association's (BCA) Best Practices in Commissioning Existing Buildings and was referred to as the "grandfather of retrocommissioning in Vermont" at an annual BCA conference.


We have helped clients reduce energy use in building systems through in depth building controls investigation and upgrades, the addition of energy savings technologies such as variable frequency drives, even on constant volume systems, commissioning the improvements and providing metering based measurement and verification to ensure performance.

Focus on efficiency

Focus on Efficiency and Savings

In one retrocommissioning project, CxA recommended installing programmable thermostats to control heat pump fans, saving 107,000 kWh annually and providing a payback of two years.

Cx Associates brings energy efficiency expertise to every project and the energy savings we find can pay for our services.

Identifying Cost-Effective Opportunities

  1. Control Measures. Low/no cost opportunities to reduce energy use and demand through improved control and the necessary control upgrades required for implementing them. 
  2. Energy Efficiency Measures. Moderate cost energy efficiency upgrades that require investment in equipment to improve efficiency of existing systems. 
  3. Capital cost items that, when implemented with planned infrastructure upgrades will significantly reduce the energy use and demand of the facility. 

Cx Associates Principal Emeritus Jennifer Chiodo reviews each facet of the RCx process in more detail in her blog post,

Why the Many Facets of Building Retrocommissioning Matter.