A service call to a South Shore home
At AirGreen , we were recently called to Sainte-Julie , on Montreal's South Shore , to work on a Namflow wall-mounted air conditioner installed in a small hallway near a bathroom. The tight wall placement and proximity to the door already presented a unique access challenge—a situation our technicians often encounter in single-family homes in the area.
The customer had noticed a lack of air conditioning performance over the past few days, accompanied by an unusual noise when the unit started up. In addition, the unit no longer seemed to blow cold air, even when the outdoor compressor started up.
Careful diagnosis and AirGreen expertise
Our technicians first performed a complete visual inspection of the Namflow indoor unit. A significant buildup of dust was blocking airflow through the heat exchanger. This lack of maintenance, combined with the unit's very high position (just above the doorframe), reduced cooling capacity and forced the fan motor to run at full load.
Using our measuring instruments, we then noticed an insufficient temperature difference between the air inlet and outlet , indicating a heat transfer problem. An inspection of the refrigeration line confirmed a slight leak of R410A refrigerant , possibly at one of the welds of the flare connection.
Repair and recommissioning
After protecting the work area and unplugging the device, we have:
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Thoroughly cleaned the indoor unit (evaporator, filters, turbine and temperature sensors).
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Locate the leak using an electronic detector and bubble test solution .
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Re-welded and tightened the fitting, then performed a complete vacuum draw on the system .
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Recharged the circuit with the exact amount of R410A according to the manufacturer's specifications Namflow.
Once the intervention was completed, the device was tested over several cycles. The customer was immediately able to notice a return to optimal performance : constant fresh air, quiet operation, and stabilized temperature within minutes of switching on.
An often neglected, but essential interview
This case illustrates a recurring problem: wall-mounted units installed in narrow spaces or near ceilings quickly accumulate dust and moisture. Without regular maintenance, they become vulnerable to:
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Significant drops in energy efficiency .
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Premature failure of the fan motor .
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Risk of refrigerant leakage caused by compressor overheating.
At AirGreen , we recommend a complete cleaning at least once a year, especially before the summer season, to ensure long-lasting efficiency and avoid costly repairs.
Final result: comfort and reliability restored
Thanks to our fast and accurate service, this Sainte-Julie customer's Namflow wall-mounted air conditioner is now working like new. This type of repair demonstrates the value of regular professional maintenance and the expertise of our residential HVAC repair teams on the South Shore.
Whether in Montreal, Laval, Longueuil, or elsewhere on the North Shore and the South Shore , our AirGreen technicians travel quickly to diagnose, repair and optimize your air conditioning and wall-mounted heat pump systems.