An improperly sized air conditioner can cost a business dearly—not just in energy usage, but in comfort, excessive maintenance, and loss of efficiency. At AirGreen, we were recently called in to correct a commercial HVAC installation in Laval that could have led to serious losses if not addressed in time. This case perfectly illustrates why proper sizing of commercial air conditioning is critical—and why our expertise stands out in the market for commercial air conditioning in Montréal, Laval, Longueuil, North Shore and South Shore.
When an oversized air conditioning system becomes an invisible but costly problem
In this project located in a commercial building in Laval, the client—a company specializing in electronic equipment storage—had recently installed a 10-ton central air conditioner through a general contractor. Shortly after commissioning, the management noticed:
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Constant temperature fluctuations in key zones.
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High humidity levels despite the unit running continuously.
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Abnormally frequent on/off cycles.
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Energy consumption far exceeding expectations.
They suspected a faulty unit, but it turned out the real issue was improper sizing. In fact, the oversized system didn’t run long enough to properly dehumidify, causing dangerous humidity spikes for the stored equipment, while also leading to premature compressor wear.
AirGreen’s technical analysis: how we made the right diagnosis
When we were called in for an inspection, our first step was to carry out a full thermal analysis of the premises: sunlight exposure, insulation, average occupancy, heat generated by electronics, etc.
Our diagnosis revealed that the actual thermal load of the space required a 7-ton unit—not 10 tons. In other words, the system was oversized by more than 40%, which not only reduced performance, but also jeopardized the integrity of the electronic equipment stored onsite.
Our solution: a new installation with a 7-ton Goodman R-32 commercial air conditioner
We recommended a full removal of the existing unit and installation of a 7-ton Goodman R-32 central air conditioning system, known for:
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Its R-32 refrigerant, which is more eco-friendly and efficient.
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Its superior energy efficiency (SEER 16.5).
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Its compatibility with smart control systems for optimized management.
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Its modular design, making future expansion easy as the business grows.
We also added smart sensors in sensitive zones, allowing for precise regulation based on ambient temperature and humidity.
Installation process: deadlines met, efficiency achieved
Our teams completed the replacement in less than three business days, without disrupting the company’s operations. We:
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Safely removed the old unit and secured existing ductwork.
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Adjusted the distribution duct to match the new airflow rate.
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Optimized the placement of supply and return vents.
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Integrated the system into the existing control network via a communication module.
Once the installation was complete, we ran a 48-hour full performance test, confirming temperature stability, a significant drop in humidity, and a 26% reduction in energy consumption.
Client testimonial: a quick and tangible return on investment
The company’s operations director highlighted the transformation:
“We thought going with a bigger system would be a smart choice, but we learned that bigger isn’t always better. AirGreen not only prevented material losses, they also improved our employees’ comfort. Their thorough approach and commercial HVAC expertise are unmatched.”
Why choose AirGreen for your commercial air conditioning needs?
At AirGreen, every project is treated with an engineer’s precision and an expert’s commitment to thermal comfort. This case shows our ability to:
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Diagnose complex issues caused by oversized commercial air conditioning systems.
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Deliver custom technical solutions based on real data and clear operational goals.
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Guarantee HVAC installations that are compliant, durable, and cost-effective across all types of buildings.
We provide service throughout Montréal, Laval, Longueuil, the North Shore, and the South Shore, catering to the specific needs of businesses, warehouses, retail stores, schools, offices, and industrial buildings.
Practical advice: how to avoid an improperly sized commercial air conditioner
Here are the most common mistakes we see:
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Relying solely on square footage instead of calculating the actual thermal load.
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Ignoring heat generated by equipment or sun exposure.
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Failing to consider real building occupancy.
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Choosing a unit based only on price, without assessing whether it’s appropriate.
To avoid these pitfalls, always work with a specialist like AirGreen who performs a comprehensive technical analysis before making any recommendations.
In summary: sizing correctly is a smart investment
This project in Laval highlights a far too common issue in the world of commercial air conditioning: decisions made too quickly without thorough analysis. Thanks to our intervention, the company was able to:
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Protect its sensitive equipment.
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Improve employee comfort.
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Significantly reduce energy use.
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Extend the lifespan of its HVAC system.
At AirGreen, we believe a properly sized HVAC system is the foundation of long-term energy performance.
Contact us today for a free technical evaluation of your existing installations or for your upcoming commercial air conditioning projects in Montréal, Laval, Longueuil, North Shore or South Shore.
