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Retro-Commissioning

by Mr John A. Herbert | Director

Retro-Commissioning also known as re-commissioning fine tunes system performance, adding capital value, lowering operating costs, and improving comfort conditions for the occupants within existing buildings.

Presently commissioning is often overlooked being viewed as only the last obstacle to payment, something that needs done, as swiftly as possible, with little thought regarding the longer term impact on building operations and energy efficiency.

building tuning, re-commissioning building services
Photo Above: Room thermostat set at 10 deg C to compensate for poor location.


Properly conducted commissioning ensures that the systems operate as intended creating comfortable environment for your employees. But what then? Does the building run for twenty years without a tuning?

Building Tuning

Over time your organisation and its needs will change and evolve and the systems degrade. The E&M systems, particularly the HVAC systems, are often over looked - ignored unless there is a major problem. That's like running your car for twenty years or more without a tune-up.

Retro-Commissioning (re-commissioning) is the equivalent of that essential vehicle tune-up, uncovering opportunities to lower operating costs, recovering lost performance, improving comfort, and importantly rediscovering lost productivity.

Correctly problems, such as the thermostat pictured above lowers operating costs, saving money.


Automatic Controls

Automation and control systems are like anything else in life, they degrade over time if they are not maintained. Because they are small, hidden, and often forgotten, thermostats are not checked for settings or failure; control loops are not tuned; sensors are not recalibrated (if they were ever calibrated in the first place); dampers get stuck; control valves leak or fail operate correctly; set points are intentionally or unintentionally overwritten, and the list goes on and on.

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Kelcroft advises organisations how to get the most from their existing HVAC systems.

With energy costs escalating saving energy is foremost in the minds of many building owners and facility managers.

But the real question is how can energy be saved, and lower costs achieved without causing other problems? Where can an energy-saving project compete for the same limited dollars an owner has available? One answer may be retro-commissioning!

Retro-commissioning is a systematic procedure to identifying operational and maintenance improvements for existing buildings and for ensuring their continued performance over time.


Would you run your car for twenty years without regular servicing - so why run your buildings that way?

Retro-commissioning process intends not only to optimize how equipment and systems operate, but also to optimise how the all the various systems function together, including the building envelope in an operational setting.



Although retro-commissioning may include recommendations for capital improvements, the primary focus is O&M activities and diagnostic testing to optimise the E&M systems.

Seven good reasons to recommend retro-commissioning:

  1. Recovering degraded performance
  2. Reducing wasted energy
  3. Improving facility operation and maintenance
  4. Bring equipment back to proper operational state
  5. Increasing equipment life, lowering the total cost of ownership
  6. Improving indoor air quality
  7. Reducing complaints and increasing tenant satisfaction
  8. Reduce staff time spent on emergency calls
  9. Improve IAQ and comfort



Independent Validation

Kelcroft provides an independent monitoring and validate commissioning validation, acting as independent eyes and ears on the ground for the entire commissioning (CX) process. From planning stage through to commissioning fieldwork, execution, and most importantly O&M documentation.


Further Information

Kelcroft's expertise covers a range of energy and environmental products Click here to learn more about Kelcroft's servicesor call us today.

For further information regarding Kelcroft's services, call today, our Hong Kong office telephone: +(852) 2335 9830, send us a fax +(852) 2335 9862, or send us an email message




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