When Performance Drops: A Typical Service Call in a Montreal Duplex
At AirGreen , we often work in typical Montreal buildings: brick walls, metal balconies, and HVAC systems visible on the rear facades. This is exactly the context of this service call in Rosemont–La Petite-Patrie , where a homeowner contacted us after noticing a marked drop in performance from his Gree wall-mounted air conditioner . The unit, installed on the upper floor of a duplex, was no longer able to maintain a stable temperature despite recent maintenance by another supplier.
On-site diagnosis: between architecture and technical constraints
Upon our arrival, we found an outdoor installation well protected by a custom-made wooden structure , securely attached to the brick. This type of arrangement is common in Montreal, especially to protect the compressor from falling ice or vandalism. However, the structure in question slightly restricted the ventilation of the condenser - a detail that, in the long term, can cause the compressor to overheat .
After some basic checks, our technicians quickly noted:
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Abnormal pressure in the refrigeration circuit.
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A slight accumulation of ice on the suction line.
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Irregular voltage levels at the compressor terminal.
The origin of the problem: a minimal leak, with major consequences
Using our electronic leak detector, we located a leak of R-32 refrigerant at a slightly loose flare fitting. Although minimal, this leak was enough to unbalance the thermodynamic cycle and reduce air conditioning power by nearly 40%.
We have :
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Isolated and purged the circuit to avoid any gas contamination.
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Tightened and replaced the faulty fitting .
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Recharged the system to the nearest gram , according to Gree specifications.
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Checked discharge pressures and temperatures to ensure optimal operation.
Immediate results: restored comfort and optimized performance
As soon as it was restarted, the customer noticed a clear difference:
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The blown air was at 18°C in cold mode (compared to 25°C before the intervention).
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The compressor was now operating at stable pressure , without abnormal noise.
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Power consumption has been reduced thanks to an exact refrigerant charge.
We have also adjusted the remote control programming to limit the overly frequent cycles , often observed after a partial recharge.
Advice and personalized follow-up
Our technicians recommended:
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A thorough cleaning of the outdoor unit in spring to prevent the fins from clogging.
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A check of the fixings of the wooden formwork , which, although aesthetic, must guarantee adequate ventilation.
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An annual check of pressures and condensate drain, especially for south-facing installations.
At AirGreen, we believe that every repair is also an opportunity to optimize the system and avoid future emergency calls. This type of intervention demonstrates the importance of rigorous maintenance, especially for air conditioners installed in urban structures where air circulation is sometimes restricted.
Local expertise, lasting trust
Whether in Montreal , Laval , on the North Shore or the South Shore , our teams of certified technicians are committed to providing transparent, fast and sustainable service. Each intervention, like the one carried out here in Rosemont–La Petite-Patrie , reflects our know-how: diagnosing accurately, repairing rigorously and ensuring the longevity of Gree, Fujitsu, Sharp, Midea systems and more.