Why Retro-Commissioning Should Come Before Energy Efficiency Investments in Commercial Buildings

Guest blog by Ranjit Gunewardane, President & CEO, North American Global Tech Services LLC

Key Takeaways:

• Retro-commissioning for buildings provides the engineering foundation for successful energy efficiency programs.
• Hidden building operational deficiencies often waste energy and water long before they become visible.
• Building analytics reveal what is happening; retro-commissioning explains why.
• Continuous monitoring of buildings helps sustain operational improvements and protect long-term return on investment.

Why Retro-Commissioning Should Be the First Step in Every Building Energy Efficiency Strategy

Commercial building owners face growing pressure to reduce energy consumption, conserve water, lower operating costs, and meet increasingly ambitious sustainability goals. To achieve those objectives, many organizations are investing in smart building technologies, including building analytics, digital twins, utility management platforms, AI-enabled monitoring, and energy reporting software.

These technologies can deliver tremendous value, but only when organizations first understand how building systems are actually performing.

Unfortunately, many organizations invest in technology before identifying the operational problems they are trying to solve. Software can monitor energy consumption and visualize building performance, but technology alone cannot determine whether mechanical, electrical, plumbing (MEP), and control systems are operating efficiently. If the underlying systems are already underperforming, even the most sophisticated analytics simply measure inefficiency rather than eliminate it.

Before investing in energy efficiency initiatives, organizations first need to understand how the building actually operates.

Why Energy Efficiency Projects Often Fall Short

Commercial buildings rarely operate exactly as originally designed.

Over time, building systems drift away from optimal performance. Common operational issues include:

• Sensors drifting out of calibration
• Control valves leaking or failing to modulate correctly
• Dampers sticking or failing to respond
• Pumps and fans operating outside efficient ranges
• Cooling towers losing thermal performance
• Economizers failing to take advantage of favorable outdoor conditions
• Building automation systems relying on outdated sequences, temporary overrides, or poorly tuned control logic

These hidden operational issues waste energy, water, maintenance resources, and capital every day. Yet many remain invisible because utility bills reveal only the symptoms—not the underlying causes.

This is where many energy efficiency programs go wrong.

Organizations often invest in smart building technologies expecting analytics, dashboards, or energy management software to identify opportunities for improvement. Those technologies are excellent at measuring energy and water consumption and identifying changes in building performance. A dashboard may report that yesterday's electricity consumption increased by 15 percent or that a building used 5,000 kWh during the previous day.

What those platforms cannot always explain is why.

Was the increase caused by a cooling tower that has gradually lost thermal performance? A leaking control valve? A stuck outside-air damper? An economizer that has been disabled for months? A chilled water loop operating outside its design parameters?

Without understanding the operational cause, organizations risk investing in technology that measures inefficiency instead of eliminating it. The missing step is retro-commissioning. A systematic engineering process, retro-commissioning identifies hidden operational deficiencies and restores building performance before organizations invest in additional technologies.

Building Analytics Reveals the Symptoms. Retro-Commissioning Identifies the Cause.

Consider a commercial office building where energy analytics report a steady increase in electricity consumption over several months. The dashboard clearly shows that electricity usage has increased by 15 percent, but the data provides no explanation for why the increase occurred.

A retro-commissioning investigation reveals that multiple hidden operational issues are contributing to the higher energy consumption, including:

• A cooling tower has gradually lost thermal performance, forcing the chillers to work harder to maintain cooling capacity.
• A leaking control valve is preventing proper water flow, reducing system efficiency.
• An economizer has been manually overridden, preventing the building from taking advantage of cooler outdoor air.
• A chilled water loop is operating outside its intended design parameters.

The analytics platform accurately reports rising energy consumption. Retro-commissioning identifies the operational problems responsible for that increase and quantifies the impact of each issue. Instead of replacing equipment unnecessarily or investing in additional software, engineering teams can correct the underlying faults first, verify the savings, and then use smart building technology to continuously monitor performance.

The result is a more informed investment decision. Instead of simply monitoring rising energy use, building owners understand why energy is being wasted, which corrective actions will deliver the greatest savings, and where technology can provide the greatest long-term value.

How a Retro-Commissioning Assessment Works

A typical retro-commissioning project combines engineering expertise, field inspections, operational data, and system testing to evaluate how existing building systems perform under real operating conditions. Rather than relying on utility bills alone, engineering teams examine HVAC equipment, control sequences, sensors, valves, dampers, pumps, chillers, cooling towers, and building automation systems to identify hidden operational deficiencies.

A retro-commissioning assessment typically includes:

• Reviewing historical BAS and utility data
• Inspecting mechanical and electrical systems
• Testing sensors, valves, dampers, and control sequences
• Identifying operational deficiencies and their root causes
• Quantifying energy, water, and financial impacts
• Prioritizing corrective actions based on cost and ROI
• Verifying that improvements deliver the expected results

Retro-commissioning provides the engineering insight needed to implement the right corrective actions. Continuous monitoring then helps ensure those improvements are sustained over time.

Smart Building Technology Delivers Greater Value After Retro-Commissioning

Once retro-commissioning identifies and corrects hidden operational deficiencies, smart building technology becomes significantly more valuable. Rather than simply reporting energy consumption, connected technologies help organizations verify improvements, sustain operational performance, and detect new issues before they become costly operational problems.

GENESIS, the smart building platform from Mitsubishi Electric Iconics Digital Solutions, extends the value of retro-commissioning by transforming operational data into actionable engineering intelligence. Continuous monitoring, real-time visualization, analytics, and diagnostics help organizations move beyond one-time optimization to continuous building performance improvement.

Through continuous monitoring and operational intelligence, GENESIS helps organizations:

• Verify that corrective actions continue to deliver the expected operational and energy performance.
• Detect equipment degradation and control issues before performance declines or operating costs increase.
• Sustain long-term energy and water savings by identifying performance drift as conditions change.
• Prioritize maintenance and operational improvements using real-time performance data and diagnostics.
• Support evidence-based capital planning with measurable operational and financial insights.
• Improve operational reliability, occupant comfort, and resource efficiency across the building portfolio.

Rather than functioning as another utility dashboard, GENESIS enables organizations to continuously validate building performance, optimize operations, and maximize the long-term value of retro-commissioning investments.

Build Smarter Energy Efficiency Programs

The most successful energy efficiency programs begin with understanding how a building actually performs. Retro-commissioning provides that foundation by identifying hidden operational deficiencies, enabling organizations to prioritize corrective actions before investing in new technologies or optimization initiatives.

Once those improvements have been implemented, continuous monitoring with smart building technology helps verify results, sustain operational performance, detect new issues as they emerge, and prevent systems from drifting back into inefficient operation.

Together, retro-commissioning and continuous performance monitoring create a smarter investment strategy. Organizations can prioritize projects based on measurable operational impact, expected savings, implementation cost, and return on investment rather than assumptions or incomplete data. 

By combining engineering expertise with operational intelligence, organizations can maximize long-term energy and water savings, improve building performance, and increase the return on every energy efficiency investment.

Turn Engineering Insight into Long-Term Building Performance

Retro-commissioning establishes the engineering foundation. GENESIS helps organizations sustain the results. Discover how the Intelligent Building Software Stack connects operational data, diagnostics, and continuous monitoring to support long-term building performance.

Explore GENESIS.

Frequently Asked Questions About Retro-Commissioning

Retro-commissioning is often misunderstood or confused with commissioning, building analytics, and energy management software. The following questions address some of the most common topics organizations consider when planning building performance improvements.

What is retro-commissioning? 
Retro-commissioning is a systematic process used to evaluate and optimize the performance of existing buildings. Engineering teams identify hidden operational issues, restore systems to intended performance, and uncover opportunities to reduce energy and water consumption while improving occupant comfort and operational reliability.

Why should retro-commissioning come before energy efficiency investments? 
Retro-commissioning identifies the operational issues responsible for wasted energy and water before organizations invest in new technologies. Correcting those underlying problems helps maximize the value and return on investment of future energy efficiency initiatives.

What is the difference between retro-commissioning and building analytics? 
Building analytics monitor equipment performance, identify trends, and detect changes in building operation. Retro-commissioning investigates the underlying causes of those changes, identifies equipment and control deficiencies, and recommends corrective actions.

Does retro-commissioning reduce energy consumption? 
Yes. By identifying inefficient equipment operation, control system issues, sensor inaccuracies, and other hidden faults, retro-commissioning helps reduce unnecessary energy and water consumption while improving overall building performance.

How does GENESIS support retro-commissioning? 
GENESIS connects operational data, building systems, and engineering intelligence within a single platform. Continuous monitoring, visualization, analytics, and diagnostics help engineering teams verify corrective actions, detect new performance issues, and sustain long-term operational improvements.

Is retro-commissioning only appropriate for older buildings? 
No. Although commonly performed on existing buildings, retro-commissioning can benefit buildings of any age whenever operational performance has changed over time or building systems require optimization.