A high-rise service call on a typical Montreal brick wall
At AirGreen , we were recently called in to repair a Sharp wall-mounted air conditioner installed on the rear facade of a residential building in Côte-des-Neiges–Notre-Dame-de-Grâce . As is often the case in this type of urban setting—brick walls, wrought iron balconies, and limited space—the work requires careful planning and attention to detail.
Diagnosis: a Sharp air conditioner losing performance
The customer contacted us after noticing a significant drop in cooling capacity and unusual noise coming from the outdoor compressor . This Sharp 12,000 BTU model, typical of residential wall-mounted installations in Montreal, had been working well for several years, but was now exhibiting:
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ice buildup on the suction line;
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incomplete defrosting during automatic cycles;
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and increased vibrations noticeable even in the home.
These symptoms indicated a pressure imbalance in the refrigeration circuit, possibly caused by a micro-leak of refrigerant or a partial obstruction of the expansion valve .
Intervention: method, rigor and safety
Given the elevated position of the Sharp compressor , our team installed a temporary safety system with harness and anchor, in accordance with the requirements of the CSST and the RBQ . After a complete inspection, our technicians:
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Checked the electrical connections and supply voltage ;
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Inspected the refrigerant pipe for leaks using an electronic gas detector;
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Measured suction and discharge pressures to confirm lack of refrigerant;
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Perform a complete vacuum draw of the system before recharging with R410A according to the manufacturer's specifications.
Result: restored performance and extended reliability
Following the repair, the Sharp wall-mounted air conditioner returned to full cooling capacity, with an indoor/outdoor temperature differential that met Sharp's performance standards. Compressor noise levels also decreased significantly, ensuring the customer's comfort and optimal energy efficiency.
We also added new black trunking to protect the refrigeration lines, which match the red brick facade—an important aesthetic concern in Montreal's central neighborhoods.
AirGreen expertise at your service
Sharp wall-mounted systems offer proven reliability, but like any HVAC unit, they require regular maintenance and rapid diagnosis in the event of a problem . At AirGreen, we work on all brands (Sharp, Gree, Fujitsu, Midea, Hitachi, Bosch, Goodman, etc.) throughout Montreal, Laval, the North Shore and the South Shore .
Our approach is simple: technical rigor, transparency, and respect for your comfort . Whether your air conditioner has a leak, a suspicious noise, or a defrosting problem, our RBQ and CCQ certified technicians ensure durable and safe repairs.
Why choose AirGreen?
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Precise and rapid diagnosis on all brands;
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Repair certified according to RBQ/CSA standards;
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Calibrated equipment for refills and pressure tests;
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Service in all residential areas of Montreal ;
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Full warranty on replaced parts.
Preventive maintenance: the key to sustainability
To avoid summer breakdowns, we recommend annual maintenance before the warm season. This maintenance includes:
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cleaning the evaporator and condenser ;
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checking refrigerant pressures and levels;
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inspection of mounting brackets ;
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disinfection of filters and verification of condensates .
This simple measure will extend the useful life of your Sharp appliance by several years and optimize its energy consumption.
AirGreen: your trusted partner in Montreal
From one-off repairs to preventative maintenance , we put our expertise at the service of your thermal comfort. Our goal is to guarantee an HVAC system that operates quietly, efficiently and sustainably , regardless of architectural or climatic constraints.
For any service call or HVAC diagnosis , contact our AirGreen team — Sharp wall-mounted air conditioning experts in Montreal and the North/South Shore .
Warning: Any handling of refrigerant fluid must be carried out exclusively by a certified technician holding an RBQ permit .