A fast, strategic, and exemplary intervention by AirGreen
In the demanding world of commercial HVAC, every hour counts. When a major shopping mall in Laval faced a complete air conditioning failure during a peak July heatwave, the building’s management turned to AirGreen to handle the urgent situation. In less than 48 hours, our team not only diagnosed the issue but also replaced the central system with a 20-ton Lennox central rooftop heat pump, restoring comfort for thousands of visitors and employees.
A critical situation requiring immediate response
At 9:00 a.m. on Monday morning, our emergency line received a call: the air conditioning system had completely shut down throughout the building, affecting both the common areas and individual stores. The interior temperature had already hit 29 °C, compromising not only customer comfort but also the safety of heat-sensitive equipment in certain shops.
On-site diagnosis: a central unit at the end of its life
By 11:00 a.m. the same day, our team of certified HVAC technicians was on-site. Upon inspecting the existing system—a Trane central air conditioner installed over 20 years ago—we quickly identified a major compressor failure, combined with a leak in the heat exchanger. Repairing the system would take several days with hard-to-source parts, and with no guarantee of long-term reliability. The only viable solution: full replacement of the central unit.
Immediate proposal and accelerated approval
Understanding the urgency, we submitted a detailed proposal to the client the same day, which included:
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Full replacement of the defective unit with a Lennox Energence® R-410A, 240,000 BTU (20-ton) central rooftop heat pump.
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Optimization of the existing ductwork network to improve airflow distribution.
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A control system upgrade with a smart thermostat connected to the building’s management system.
All this including installation, commissioning, and full warranty. The mall manager approved the proposal within the hour.
Express delivery and AirGreen team mobilization
Thanks to our preferred partnership with Lennox Canada, the unit was delivered the next morning to our Montréal warehouse. Our team coordinated delivery to the Laval site within three hours and immediately began the work.
A two-phase installation, expertly executed
Phase 1: Removal of the existing unit
Our technicians safely proceeded with the removal of the old unit, using a crane to lift it from the mall’s rooftop. This operation, conducted during off-peak hours, required meticulous logistical planning and authorization from the City of Laval.
Phase 2: Installation of the new Lennox heat pump
The Lennox Energence® heat pump, renowned for its high energy efficiency (SEER 13, EER 11.5), was installed on a new galvanized steel base. Electrical connections, refrigerant lines, and ductwork were completely reworked to ensure maximum performance and long-term reliability.
Technical details of the installed equipment
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Brand: Lennox
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Model: Energence® LGH240H4B
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Type: Commercial rooftop central heat pump
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Capacity: 240,000 BTU (20 tons)
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Refrigerant: R-410A
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Energy Efficiency: SEER 13 / EER 11.5
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Sound Level: 77 dB
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Control: Lennox iComfort™ smart thermostat
Final result: comfort and productivity fully restored
By 8:00 a.m. Wednesday—47 hours after the initial call—the new unit was fully operational. Temperatures in the mall had returned to a comfortable 23 °C, and satisfaction was evident among both shop owners and customers.
Testimonial from the mall manager:
"We were impressed by the responsiveness, clear explanations, and professionalism of the AirGreen team. They saved our week."
Why choose AirGreen for your commercial HVAC projects in Laval and Greater Montréal
At AirGreen, we specialize in HVAC solutions for complex commercial buildings, whether in Laval, Montréal, Longueuil, on the North Shore or the South Shore. Here’s what sets us apart:
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Fast interventions with teams available 7 days a week
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Direct access to trusted equipment brands such as Lennox, Fujitsu, Gree, Bosch, Trane, and more
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Advanced technical expertise for complex systems (rooftop, multi-zone, VRF, etc.)
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Complete service: from design to post-installation maintenance
Practical tips for commercial building managers
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Have your central air systems inspected annually
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Plan to replace units over 15 years old
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Work with an HVAC team that can respond quickly in emergencies
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Choose equipment with eco-friendly refrigerants (R-32, R-410A, R-454B)
Proven expertise throughout the region
Our work in Laval is just one example among many: we’ve recently completed similar installations in Brossard, Saint-Eustache, Montréal-Nord, Repentigny, and Longueuil. In each of these projects, our goal remains the same: to deliver a fast, durable, and energy-efficient solution.
In conclusion, this mission in Laval perfectly reflects our commitment: acting with speed, precision, and professionalism to restore comfort in the shortest possible time. Whether you’re a property owner, building manager, or commercial tenant, AirGreen is your trusted HVAC partner in Laval and across Greater Montréal.
