Commercial HVAC in Laval: Installation of rooftop units for a distribution center

Energy optimization and enhanced reliability through a complete replacement of commercial roof systems

As part of a major commercial HVAC modernization project in Laval , AirGreen was contracted to replace several rooftop units at a large logistics distribution center located in Laval's industrial park. The main objective was to increase heating and cooling reliability , reduce energy consumption , and ensure compliance with new environmental and safety requirements.

Context of the mandate

The building, with a surface area of ​​over 25,000 sq ft, houses storage areas, administrative offices, and an order preparation area. The former rooftops, installed more than 20 years ago, featured:

• Repeated breakdowns during peak periods ;

• Low energy efficiency (EER < 8.0);

• Temperature balancing problems between zones;

• Wear and tear on heat exchangers threatens indoor air quality.

The client was looking for a sustainable solution allowing centralized management via BMS (building management system) and a rapid return on investment.

Constraints and planning

The main constraints of the project:

• Recent bituminous membrane roofing requiring a lifting plan without perforation ;

• Close coordination with other trades (electricians, roofers, automation technicians);

• Intervention windows limited to 48 hours to avoid any interruption of activity;

• Variable weather conditions, requiring a phased installation sequence .

To meet these challenges, AirGreen developed a three-phase execution plan , validated by a structural engineer and a representative of the manufacturer.

Technical solution chosen

After thermal analysis and energy simulation, our team selected high-efficiency Trane Voyager series rooftop units , equipped with:

• Variable speed scroll compressors , allowing fine modulation of the load;

• From a heat recovery system on exhaust air , improving overall efficiency by 18%;

• A plate heat exchanger to optimize ventilation and limit losses;

• A BACnet control module for direct integration into the existing BMS.

Each unit was mounted on a new custom-adapted base , avoiding any modification to the roof and minimizing civil engineering work.
The ducts were insulated and sealed according to ASHRAE 90.1 and CSA C282 standards, ensuring airtightness and thermal performance.

Construction progress

1. Preparatory phase: structural analysis, lifting plan and coordination with the City of Laval for crane permits.

2. Execution phase: removal of the old rooftops using a 90-ton crane, transport of the new modules onto the roof, mechanical and electrical connections.

3. Commissioning phase: calibration of probes, balancing of airflows, programming of control sequences (heating/cooling/dehumidification).

All operations were completed within 48 hours , without interruption to the internal logistics of the distribution center.

Compliance and safety

The project complies with:

• CSA B52 standards (refrigeration system safety);

• ASHRAE 62.1 for indoor air quality;

• The requirements of the Quebec Building Code and the RBQ guidelines.

Intermediate inspections were carried out by a building mechanical engineer to validate structural compliance, electrical safety and the stability of the anti-vibration mounts.

Results and Key Performance Indicators (KPIs)

The results measured 30 days after commissioning demonstrate:

• 31% reduction in total energy consumption related to HVAC;

• 22% improvement in air exchange rate;

• Indoor temperature stabilized at ±0.3 °C across all zones;

• External noise reduced by 5 dB(A) thanks to the new ECM fans.

The system is now remotely monitored via the building management system (BMS ), enabling:

• Proactive anomaly detection ;

• A dynamic timetable based on occupancy;

• Automatic alerts in case of parameter deviations.

Maintenance and post-installation follow-up

AirGreen has integrated the site into its commercial preventative maintenance program , which includes:

• Quarterly cleaning of coils and filters;

• Pressure and subcooling checks;

• Inspection of the condensation tray and belts;

• Seasonal performance report sent to the building manager.

A priority 24/7 SLA contract guarantees intervention in less than 3 hours in the event of a critical shutdown.

ROI and financing

The initial investment, amortized over five years, will be recouped from the third year onwards thanks to:

• Reducing energy costs (electricity and natural gas);

• Lower maintenance costs thanks to increased compressor reliability;

• Eligibility for the Quebec government's EcoPerformance grant program.

The financial evaluation demonstrates an estimated return on investment of 3.2 years , with an annual decrease in operating costs of nearly $15,000.

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This project demonstrates AirGreen's ability to design, plan, and execute large-scale HVAC installations , even in critical industrial environments. Through an integrated approach combining engineering, energy efficiency, and regulatory compliance , AirGreen ensures its Greater Montreal clients sustainable performance and optimal comfort year-round.