A service call on a Montreal roof: AirGreen expertise in action
At AirGreen , we are regularly called upon to intervene in multi-unit buildings in downtown Montreal. Recently, our team was called upon in Côte-des-Neiges to address a problem affecting a Napoleon wall-mounted heat pump installed on the roof of a modern residential building.
Occupants reported a gradual loss of air conditioning performance, accompanied by an unusual operating noise. In hot weather, this situation quickly became uncomfortable.
Precise diagnosis: a heat pump that is stressed and dirty
Upon our arrival, our certified technicians conducted a complete inspection of the outdoor unit. This Napoleon heat pump , a single-zone wall-mounted model, was installed on a stable roof support, connected to a distribution duct by a waterproof metal box.
The first observations:
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Accumulation of debris and dust on the heat exchanger reducing heat removal capacity.
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Slight corrosion on the electrical connection box , caused by exposure to wind and rain.
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Refrigerant pressure slightly lower than normal, suggesting a slow microleak in the liquid line.
These elements, combined, explained the drop in performance of the heat pump.
Intervention: cleaning, resealing and complete rebalancing
1. Cleaning and refurbishing the outdoor unit
We removed the protective grilles and thoroughly cleaned the condenser using a specific biodegradable product designed for rooftop installations. This treatment restored optimal air circulation.
2. Inspection and resealing of refrigeration connections
Using an electronic detector, we located a micro-leak on a flare fitting in the refrigeration circuit. The seal was replaced, tightened to the exact torque recommended by Napoleon, and then resealed with a professional sealing compound.
3. Refrigerant recharge and performance checks
A partial recharge of R-410A was performed to bring the system back to nominal pressure. We then conducted a full performance test :
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Blowing temperature restored to 11°C in air conditioning mode.
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Delta T meets manufacturer's standards.
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Operating noise level reduced by 20%.
Result: restored comfort and optimal performance
Following our intervention, residents immediately noticed a significant improvement in indoor comfort. The Napoleon heat pump was once again operating at full capacity, with stabilized electricity consumption.
We also recommended:
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Biannual preventive maintenance , especially for roof installations exposed to the elements.
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Adding a light anti-corrosion treatment to the housing to extend the life of the hardware.
What sets AirGreen apart
Our interventions are not limited to repairing a breakdown: we seek to prevent future problems and optimize each HVAC system so that it operates reliably, economically and sustainably.
Whether you own a building in Montreal, Laval, on the North Shore or the South Shore, our AirGreen team offers you:
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Technical expertise on all brands, including Napoleon, Fujitsu, Gree, Midea, Trane and Sharp .
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State-of-the-art diagnostic tools.
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Technicians continuously trained according to the latest HVAC industry standards.
Conclusion: Peace of mind from AirGreen
This Napoleon wall-mounted heat pump repair in Côte-des-Neiges perfectly illustrates our approach: technical rigor, transparency, and attention to detail. Thanks to a quick and methodical intervention, we restored this system to its full performance, while ensuring lasting comfort for the occupants.