When a wall system shows signs of fatigue: a typical service call in Saint-Laurent
At AirGreen , our technicians are often called upon to work on wall-mounted air conditioners that are experiencing performance issues after several years of use. This is exactly what happened in this red brick residence in Montreal's Saint-Laurent district. The customer contacted us after noticing that their North Cool unit was no longer cooling effectively, despite the regular noise of the outdoor fan.
Initial diagnosis: a lack of performance that hides a pressure problem
Upon our arrival, we noticed that the outdoor unit, installed under the awning on the rear facade, was working, but without the expected pressure level. The indoor air remained lukewarm, a typical sign of a lack of refrigerant or a tired compressor .
Our technician proceeded to:
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a check of the low and high side pressures ,
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an interior blowing temperature test ,
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a visual inspection of the coil and copper fittings .
The verdict: minor leak at a flare fitting on the liquid line, a common problem in installations built several years earlier without adequate vibration protection.
Repair: resealing and upgrading of the system
We undertook a complete repair of the leak by:
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dismantling the connection protection casing,
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redoing the flare using a calibrated precision tool,
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adding a new layer of insulating protection around the pipes,
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carrying out a complete vacuum to eliminate all traces of humidity,
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and finally, recharging the system with R-410A refrigerant , according to the manufacturer's specifications North Cool.
Once the leak test was successful, the air conditioner returned to perfect pressure and optimal performance.
Performance verification and final adjustments
After recharging, we observed:
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an indoor blowing temperature of 11°C ,
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stable electricity consumption ,
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a normal condensate flow ,
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and no perceptible vibration on the wall structure.
We also repositioned the wall bracket and tightened the fixings to limit any transfer of vibrations to the brick facade.
Result: Restored comfort and newfound peace of mind
The customer, who was dreading replacing his air conditioner, was relieved to learn that a simple , targeted repair was all it took to extend the life of his system. With this refurbishment, his wall-mounted North Cool is now ready to withstand several more summer seasons.
AirGreen Maintenance Tips for Wall-Mounted Air Conditioners
To prevent this type of breakdown from recurring, our experts recommend:
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a complete annual maintenance , including pressure checks and cleaning of coils;
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to monitor any drop in performance or abnormal noise;
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and to have the connections inspected after each winter, particularly in areas where temperature variations are significant, such as in Montreal and on the North Shore .
Recognized expertise throughout Montreal and its surrounding areas
This successful intervention in Saint-Laurent perfectly illustrates AirGreen's philosophy: diagnose with rigor, repair with precision and advise with transparency .
Whether in Laval , Longueuil , on the South Shore or the North Shore , our team always puts its know-how at the service of the lasting comfort of our customers.