A typical service call in a downtown Montreal apartment
At AirGreen , we often receive calls from clients living in older buildings in Côte-des-Neiges–Notre-Dame-de-Grâce , a neighborhood where thermal comfort can vary considerably between floors and seasons. In this specific case, our team intervened in an apartment where the Fujitsu wall-mounted air conditioner was no longer blowing cold air, despite a normal display on the remote control.
The owner, concerned about a complete breakdown, contacted our team for a quick diagnosis . The system had only been installed for a few years, but was already showing signs of lack of maintenance .
Diagnosis: Understanding the cause of performance loss
Upon our arrival, we conducted a complete examination of the wall system. Here are the main observations:
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The Fujitsu indoor unit was covered with a thin layer of dust and protective plastic that was not removed after initial installation.
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The air filter was clogged, significantly reducing airflow.
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The condensate was no longer draining properly, causing moisture to build up in the interior tray.
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Finally, after checking with a pressure gauge, we noticed a slight lack of R-410A refrigerant , responsible for the lack of cooling power.
This type of situation is common in Montreal, especially when annual maintenance of the HVAC system is not performed.
Fujitsu System Repair and Refurbishment
Our certified technician took the following steps:
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Complete cleaning of the front panel, evaporator coil and centrifugal fan.
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Removing the protective film still on the housing — a common oversight in some residential installations.
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Antibacterial disinfection of the condensate drain and complete purging of the line to prevent water backflow.
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Checking the tightness of the refrigeration circuit using a nitrogen test.
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Partial recharge of R-410A refrigerant , adjusted according to Fujitsu recommended pressures.
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Complete performance test : checking the discharge temperature, sound level and compressor start cycle.
At the end of the intervention, the air conditioner was again blowing air at 7°C at the outlet of the vent, confirming a return to optimal efficiency.
Result: comfort restored and preventive maintenance established
The customer immediately noticed the difference. The previously noisy and underperforming unit was now running quietly and efficiently again. We also offered to implement an annual AirGreen maintenance plan , including:
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Complete cleaning of the interior and exterior system,
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Checking the refrigerant level,
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Checking electrical connections and air flow,
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And validation of the correct operation of the condensate pump.
This annual monitoring helps avoid costly repairs and extends the life of the equipment.
The Importance of Regular Maintenance of Wall-Mounted Air Conditioners in Montreal
In densely populated neighborhoods like Côte-des-Neiges, where older buildings are not always well ventilated, Fujitsu, Midea, Gree, or Sharp wall-mounted air conditioners are essential for maintaining consistent comfort. However, without proper maintenance:
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dust accumulates on the coils,
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the sensors lose precision,
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and energy efficiency drops by up to 30% .
A simple annual cleaning by an AirGreen certified technician is often enough to prevent breakdowns and reduce electricity consumption during heat waves.
AirGreen: your HVAC partner in Côte-des-Neiges and throughout Montreal
We intervene every week for the repair and maintenance of wall-mounted air conditioners in the residential and commercial sectors of Montreal, Laval, Longueuil, the North Shore and the South Shore.
Our team is trained to quickly diagnose and repair all brands — Fujitsu, Midea, Sharp, Gree, Haier, Goodman , and many more.
Whether it's a compressor problem, a refrigerant leak, an electronic card problem or an electrical failure , we provide reliable, documented and guaranteed repairs.
In summary
This intervention in Côte-des-Neiges perfectly illustrates our commitment: to quickly diagnose, sustainably repair and optimize the energy performance of HVAC systems installed in Montreal.
Thanks to AirGreen expertise, comfort has returned… and for good.