A real case handled by AirGreen where neglecting HVAC maintenance led to a thermal disaster during a summer heatwave
Québec summers can be relentless—especially in high-traffic commercial environments like shopping centers. When a central air conditioning system fails during a heatwave, the consequences go far beyond discomfort: they directly impact customer health, employee productivity, and retailer revenue. At AirGreen, we were called in for an emergency at a Laval shopping center to manage a critical situation caused by a simple HVAC maintenance oversight. This real-world case perfectly illustrates why preventive maintenance should never be neglected.
The Facts: A Shopping Center Left Without Air Conditioning in the Middle of July
In the heart of July, with outdoor temperatures soaring above 34°C, the central air conditioning system of a mid-sized shopping center in Laval suddenly stopped working. Within just a few hours:
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Indoor temperatures exceeded 30°C, making several shops uninhabitable.
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Customers left the premises, causing a sharp drop in foot traffic.
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Employees experienced heat-related illness, with some leaving work early.
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Several retailers shut down temporarily, resulting in estimated revenue losses of several thousand dollars per day.
The Cause of the Problem: A Clear Lack of Maintenance
After a quick technical inspection, our AirGreen team identified the cause of the failure:
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Completely clogged filters: they hadn’t been replaced in over a year.
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Dust-covered condensers: blocking effective heat transfer.
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No refrigerant level checks since the system’s installation more than 5 years prior.
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No preventive service contract in place with a qualified HVAC provider.
This neglect caused the central heat pump compressor—a Carrier brand, model 25HNB6, 10-ton unit—to overheat, triggering an emergency automatic shutdown.
AirGreen’s Emergency Response in Laval: Fast, Thorough, Efficient
Contacted by the center’s facility manager, we dispatched an emergency crew to the site within 2 hours. Our certified HVAC technicians immediately:
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Performed a full cleaning of the coils and filters using non-corrosive professional-grade products.
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Recharged the system with R-410A refrigerant after detecting low levels and recalibrated the entire system.
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Inspected the compressor in detail, which, thankfully, had not sustained irreversible damage.
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Implemented a new preventive HVAC maintenance contract with scheduled check-ups every 6 months.
Within 24 hours, the system was fully operational again, restoring indoor temperatures to 23°C, much to the relief of both retailers and customers.
Lessons Learned: Critical HVAC Maintenance Mistakes to Avoid at All Costs
This case highlights the consequences of a sadly frequent oversight in the commercial sector:
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Delaying preventive maintenance for budget reasons always ends up being more expensive in the long run.
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Ignoring early warning signs (unusual noises, declining performance, etc.) often leads to major system breakdowns.
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Operating without a service agreement with a qualified HVAC contractor increases the risk of missing key intervention windows.
Our Recommendations to Prevent a Similar Disaster
At AirGreen, we’ve drawn several essential lessons from this emergency intervention—advice we share with all commercial building managers in Montréal, Laval, Longueuil, and across the North and South Shores:
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Implement a regular HVAC maintenance plan with at least two technical visits per year.
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Prioritize inspections at seasonal transitions (spring and fall), which are critical periods for system performance.
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Train your on-site staff to recognize signs of malfunction and respond quickly.
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Install remote monitoring systems to detect real-time anomalies in your HVAC unit.
Why AirGreen Is Your Best Ally for Commercial HVAC Management
With over 15 years of experience in HVAC installation, maintenance, and repair, AirGreen stands out through its technical expertise, rapid response capability, and personalized approach to every building.
By choosing AirGreen, you benefit from:
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A 24/7 HVAC emergency service covering Montréal and the surrounding regions.
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Certified teams capable of diagnosing and repairing even the most complex breakdowns.
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Thorough follow-up and technical reports after each intervention.
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Tailored maintenance contracts designed specifically for your infrastructure and business needs.