Behind Every Failed Installation Is an Expert Solution from AirGreen
In the world of residential and commercial HVAC in Montréal, Laval, Longueuil, North Shore and South Shore, botched wall-mounted heat pump installations are far more common than most people think. Poor sizing, incorrect pipe slope, no thermal study, or simply an inexperienced installer — the consequences are numerous and sometimes disastrous. Reduced performance, excessive noise, rising energy bills, and even complete system failure within a few years.
At AirGreen, we’re often called in after a faulty installation by another company. Our role? Fix the unfixable, bring a poorly installed system back to life, and most importantly, restore the customer’s trust in wall-mounted heat pump technology. Here are a few real, authentic stories from our daily work in the field.
Case #1 – Laval (Sainte-Dorothée): A Gree Lomo Heat Pump Poorly Installed and No Thermal Comfort
Problem Identified
A couple reached out to us after having a Gree Lomo 12,000 BTU wall-mounted heat pump installed by a non-certified contractor. They complained about unusual noises, inconsistent temperatures, and excessive energy consumption.
When our technician arrived on site, they found:
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Poorly insulated conduits causing thermal loss
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Incorrect refrigerant levels
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An indoor unit installed too close to the ceiling, affecting air distribution
AirGreen's Solution
We:
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Drained the system and refilled to the correct refrigerant level
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Reinstalled the indoor unit at the optimal height
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Added thermal insulation to the conduits
The result: stable temperatures, a 20% drop in energy use, and a happy couple who could finally enjoy their system.
Case #2 – Longueuil (Saint-Hubert): A Fujitsu KZAH Installed Without a Thermal Study
Problem Identified
In a single-family home, a Fujitsu KZAH 18,000 BTU wall-mounted heat pump had been installed in a space that only needed about 9,000 BTU. The result:
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Short cycles (the unit turned on and off constantly)
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Uneven comfort in rooms further away
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Increased noise with each restart
AirGreen's Intervention
We performed a full thermal assessment and recommended:
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Replacing it with a 9,000 BTU R-32 unit, better suited to the space
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Installing an air redistribution fan in the more distant areas
The customer immediately noticed a 30% reduction in electricity consumption and more even comfort throughout the house.
Case #3 – North Shore (Blainville): A Misaligned Condensate Drain Causing Water Damage
Observed Problem
A Bosch IDS 2.0 R-454B wall-mounted heat pump, despite being high-end, was causing water infiltration inside the wall. The issue? The condensate drain, installed without proper slope, was backing up during periods of high humidity.
What AirGreen Did
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Completely rerouted the drain with proper slope
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Added a condensate pump to ensure reliable drainage
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Dried the affected wall and provided antifungal treatment recommendations
The initially discouraged customer was able to keep their heat pump thanks to our precise intervention, avoiding full replacement costs.
Case #4 – Montréal (Rosemont): A Poorly Mounted Wall Unit Causing Vibrations
Diagnosis
A Gree Sapphire 12,000 BTU wall-mounted heat pump, installed by a general contractor, vibrated so intensely that the shaking could be felt on the floor.
AirGreen’s Resolution
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Completely uninstalled the indoor unit
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Reinforced the structural wall with a dedicated mounting plate
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Installed a certified anti-vibration bracket
Since then, no more vibrations. The customer even decided to entrust us with their annual maintenance.
The Most Common Errors Identified by Our Teams
Here are the most frequent wall-mounted heat pump installation problems we’ve observed at AirGreen across Montréal, Laval, Longueuil, North Shore, and South Shore:
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Oversized or undersized unit
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Poor drainage of condensates
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Incorrect placement of the indoor unit
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No leak tests or refrigerant adjustments
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Uninsulated conduits causing energy loss
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Non-compliant electrical wiring
How to Avoid a Failed Installation
1. Always Request a Pre-Installation Thermal Study
This is the foundation of proper sizing. Without it, you risk paying for a unit that doesn’t match your needs.
2. Hire a Certified HVAC Installer
At AirGreen, our technicians are certified, continuously trained, and specialized in high-performance wall-mounted heat pump installations.
3. Check References and Past Projects
We regularly share our completed projects across Laval, Montréal, Longueuil, and the surrounding areas. It’s the best proof of our commitment to quality and rigor.
4. Ask for a Clear Installation Warranty
We provide a comprehensive installation warranty, in addition to the manufacturer’s warranties. This gives our clients total peace of mind.
Why AirGreen Is Your Best Option After a Failed Installation
Our expertise doesn’t stop at new installations. We take over failed projects, correct other contractors’ mistakes, and guide our clients toward durable, efficient, grant-eligible solutions.
By choosing AirGreen, you’re choosing:
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An experienced, attentive team
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Tailor-made solutions for your home
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Full transparency every step of the way
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100% compliance with 2026 regulations and grants such as LogisVert, Rénoclimat, and Chauffez Vert
If your wall-mounted heat pump isn’t performing as expected, don’t give up. Contact us. It’s never too late to fix the unfixable.