When Air Conditioning Turns Into a Nightmare: Critical Mistakes to Avoid in Your HVAC Installations
At AirGreen, we’ve seen the best…and the worst. In the world of air conditioning and heating in Laval, certain installation or maintenance mistakes can be expensive — in terms of money, comfort, and even safety. Through these 5 real stories from Laval, we highlight critical mistakes in HVAC installation, and most importantly, how to avoid them with professional expertise.
1. An Undersized Wall-Mounted Heat Pump: Overwhelming Heat in a Laval West Daycare
A newly opened daycare in Laval West decided to install a 12,000 BTU wall-mounted heat pump by an unqualified contractor. The result? During a heatwave, the indoor temperature exceeded 30°C, making the premises suffocating for the children.
The problem:
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An undersized unit for a room over 500 sq. ft.
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No prior thermal assessment.
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The system was constantly overloaded, causing premature wear.
The AirGreen Solution:
We replaced the unit with an 18,000 BTU Gree Extreme heat pump, ensuring proper airflow and system balancing. The result: optimal comfort, energy savings, and a satisfied daycare.
2. Extreme Condensation in a Chomedey Home: The Return of Ghost Humidity
In a renovated bungalow in Chomedey, a family noticed mold and condensation around their ventilation vents. Yet, their HVAC system had been recently replaced.
The cause:
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No humidity control integrated into the system.
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Lack of a HRV (Heat Recovery Ventilator).
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Imbalanced air circulation between hot and cold zones.
Our intervention:
Installation of a VENMAR HRV, balancing the ducts, adding humidity sensors. The indoor air is now dry, healthy, and perfectly distributed throughout the home.
3. A Dramatic Short Circuit in a Laval-des-Rapides Business: The DIY Electrician
A restaurant attempted to save money by entrusting the electrical connections of its central air conditioning system to a non-certified electrician. Two weeks later: short circuit, total system failure, and ventilation shutdown during peak lunchtime.
The risks involved:
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Fire hazard.
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Voiding the manufacturer’s warranty.
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Temporary closure of the business.
What we did:
Completely removed the non-compliant wiring, reinstalled per CSA standards, and configured a Lennox system with centralized controls. The client was able to reopen in 48 hours, with a safe and certified system.
4. Extreme Energy Consumption in Vimont: A Climax That Costs More Than It Cools
A condo in Vimont was experiencing an electricity bill exceeding $300/month in the summer, just for running its wall-mounted air conditioner.
The diagnosis:
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An old SEER 9 model, energy-draining.
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Poor maintenance of the filters and coils.
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Continuous operation due to improper configuration.
AirGreen’s result:
Replaced with a Fujitsu KZAH R32 wall-mounted air conditioner, SEER 26, along with a full maintenance overhaul and optimized settings. The bill dropped by nearly 40%, and the indoor temperature remained steady.
5. Hidden Installation in a False Ceiling… Until the Water Damage in Sainte-Dorothée
In a small condo building in Sainte-Dorothée, a contractor installed a ducted unit in a suspended ceiling without a secondary drainage pan. When the unit failed, it leaked for several days, causing over $12,000 in damage to neighboring units.
Why this is a grave mistake:
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No overflow sensor.
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Non-compliance with HVAC drainage standards.
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Impossible to access: installation was hidden.
Our reinstallation:
Dismantled the false ceiling, installed a Lennox ducted system with a retention pan, overflow sensor, and secure technical access. Since then, no incidents, and the system is compliant with standards.
What These Mistakes Teach Us: Air Conditioning Is Not to Be Taken Lightly
At AirGreen, we often meet clients who, in trying to save costs, rely on unqualified installers or choose improperly sized equipment. The problem is not just the comfort: these mistakes lead to financial, health, and sometimes legal risks.
We believe that a reliable HVAC installation depends on:
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Precise thermal analysis of the space.
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Choosing the right equipment for the layout, occupancy, and usage.
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Compliance-based installation, by certified technicians.
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Regular HVAC maintenance, with cleaning, pressure checks, and system calibration.
Why Choose AirGreen for Your HVAC Projects in Laval?
A Trusted Local Expertise
Based in the Greater Montreal area, we carry out residential and commercial installations in Laval, Montreal, Longueuil, South Shore, and North Shore, with hundreds of satisfied clients.
A Certified Team
All of our technicians are trained for installation, maintenance, and repair of major brands: Lennox, Gree, Fujitsu, Midea, Zephyr, and more.
A Human, Professional, and Forward-Thinking Service
We support you from evaluation to commissioning, including LogisVert grant applications, financing, and maintenance services.
In Conclusion: Horror Shouldn’t Be an Option… Choose AirGreen
Each of these stories is true. They prove that poorly planned air conditioning can turn into a nightmare. With our rigorous, technical, and needs-centered approach, we guarantee durable, compliant, and truly effective installations.
At AirGreen, we don’t just sell HVAC systems — we ensure your peace of mind.