How recommissioning improves energy efficiency in commercial buildings

How recommissioning improves energy efficiency in commercial buildings

Many commercial buildings waste energy because their mechanical systems no longer run as designed. Schedules drift. Sensors fail. Controls get overridden and never reset. Recommissioning—often called RCx—fixes these issues without major equipment replacement. In Quebec, this approach is supported by public funding because it can cut whole-building energy use by 5% or more through low‑cost operational improvements.

What is recommissioning (RCx)?

Recommissioning is a structured process that reviews, tests, and fine‑tunes existing building mechanical systems. The goal is to restore optimal performance based on how the building is actually used today—not how it was designed years ago.

RCx usually focuses on:

• Heating, ventilation, and air conditioning (HVAC)
• Building automation and controls
• Pumps, fans, and air handling units
• Sensors, setpoints, and operating schedules

Unlike retrofits, recommissioning does not usually involve installing new equipment. Instead, it improves how existing systems work together.

Under Quebec’s ÉcoPerformance — Recommissioning of building mechanical systems (RCx) component, RCx must follow five formal phases:

• Planning
• Investigation
• Implementation
• Transfer
• Continuous monitoring

How recommissioning improves energy efficiency

Recommissioning improves energy efficiency by eliminating hidden waste that builds up over time. Common findings in commercial buildings include equipment running when spaces are empty, heating and cooling operating at the same time, or airflow rates set far higher than needed.

Here’s how RCx delivers measurable savings:

• Optimizes schedules
  Systems are aligned with real occupancy patterns, reducing after‑hours energy use.

• Corrects control logic
  Control sequences are tested and rewritten so systems respond properly to temperature, humidity, and demand.

• Fixes sensor and calibration issues
  Faulty sensors cause systems to overwork. RCx identifies and corrects these errors.

• Balances airflow and water flow
  Proper balancing reduces fan and pump energy while improving comfort.

For ÉcoPerformance eligibility, the implemented RCx measures must represent at least 5% of the site’s energy consumption before the project starts.

Funding for recommissioning in Quebec

Quebec businesses can offset a large portion of RCx project costs through the ÉcoPerformance — Recommissioning of building mechanical systems program.

Key funding details:

• Funding amount: Up to $100,000
• Coverage: Maximum 75% of eligible costs
• Status: Open
• Jurisdiction: Quebec

Eligible applicants include:

• Businesses and enterprises
• Institutions and municipalities
• Organizations in commercial, industrial, manufacturing, agricultural, and institutional sectors

Eligible costs may include:

• Fees for an accredited RCx agent
• External consultant fees
• Internal specialist labour
• Rental of measurement and verification equipment

Buildings must be located in Quebec. New buildings can apply three years after initial commissioning.

Tools like GrantHub’s eligibility matcher can help you filter RCx funding programs by province, building type, and sector in seconds.

When should you consider recommissioning?

Recommissioning delivers the best return when:

• Your building is 5–25 years old
• Energy bills have crept up without obvious cause
• Comfort complaints are increasing
• You plan a retrofit later and want a low‑cost first step

RCx is often used as a foundation before deeper upgrades like heat recovery, electrification, or control system replacements.

Common mistakes to avoid

Skipping the investigation phase
Energy savings come from detailed testing. Rushing straight to fixes often misses the biggest opportunities.

Using non‑accredited professionals
ÉcoPerformance requires qualified RCx agents. Using the wrong team can make costs ineligible.

Ignoring ongoing monitoring
Without continuous monitoring, systems slowly drift back to inefficient operation.

Overlapping funding without disclosure
RCx funding can sometimes be combined with other programs, but all financial aid must be disclosed upfront.

Frequently Asked Questions

Q: What is recommissioning (RCx) under ÉcoPerformance?
RCx is a formal process to optimize existing building mechanical systems through testing, adjustment, and verification. It focuses on operational improvements rather than new equipment.

Q: How much funding can I receive for an RCx project?
ÉcoPerformance can cover up to 75% of eligible costs, to a maximum of $100,000 per project.

Q: Does my building need to achieve a minimum energy reduction?
Yes. The implemented measures must represent at least 5% of the site’s pre‑project energy consumption.

Q: Are consultant and internal labour costs eligible?
Yes. Eligible costs include accredited agent fees, external consultants, internal specialists, and equipment rental.

Q: Can RCx funding be combined with other grants?
In some cases, yes. All other financial assistance must be declared, and stacking rules apply.

GrantHub tracks hundreds of active grant programs across Canada—including provincial energy efficiency funding—so you can quickly see which ones match your building and project type.

Next steps

Recommissioning is one of the fastest, lowest‑risk ways to improve energy efficiency in commercial buildings. If your building is in Quebec, ÉcoPerformance can significantly reduce the cost of getting started. GrantHub helps you confirm eligibility, compare energy programs, and plan your next efficiency project with confidence.

See also:

• Energy Efficiency and Clean Tech Rebates for Canadian Businesses
• How to Plan Energy, Resource, and Environmental Projects for Canadian Government Funding
• Waste Heat Recovery Funding in Quebec: How It Supports the Energy Transition