An outdoor unit in distress: our intervention in Dorval
When a Dorval customer contacted us about a performance issue with a Friedrich air conditioner , they described typical symptoms of a system struggling to cool despite a running compressor. At AirGreen , we know that accurate diagnosis is the key to a lasting repair—especially for inverter units like this one, designed for optimal energy efficiency.
Initial diagnosis: loss of efficiency and fouling of the condenser
Upon arrival, our technician immediately noticed that the outdoor unit, securely mounted on galvanized steel wall brackets , was showing obvious signs of wear:
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dirt buildup on the condenser fins;
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slight oxidation of the metal frame;
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stagnation of rainwater under the base, promoting corrosion.
A pressure test of the refrigeration circuit revealed a slight leak of R-410A refrigerant , the probable cause of the observed drop in efficiency.
Technical intervention: restoring the efficiency of an inverter system
Our HVAC experts have undertaken a complete upgrade procedure :
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Cleaning the condenser with steam and specialized degreaser to remove deposits.
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Location and welding of the micro-leak at the flare connection.
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Full circuit recharge to Friedrich specifications, with superheat and subcooling control.
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Inspection of the external fan and lubrication of the motor shaft.
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Checking the inverter module to ensure correct modulation of the compressor.
Once the intervention was completed, we noticed an immediate return of cold air flow and stability of the refrigeration pressure .
A unit extended for several seasons
After these fixes, the Friedrich air conditioner returned to its original performance, providing the residence with consistent comfort even on Dorval's hot days . We also applied a protective anti-corrosion coating to the base and supports to extend the system's lifespan.
AirGreen Maintenance Tips
To avoid similar problems, we recommend:
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an annual professional cleaning before the summer season;
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a refrigerant pressure check every two years;
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maintaining sufficient air clearance around the condenser (at least 60 cm);
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and, ideally, the installation of a protective canopy to limit exposure to rain and rust.
Our interventions are part of our ongoing commitment to providing reliable and durable HVAC solutions throughout Montreal, Laval, the North Shore, and the South Shore . Whether it's a wall-mounted air conditioner, central heat pump, or multi-zone system repair , our trained technicians always work with the same attention to detail and performance.
Final result: restored comfort and optimized efficiency
A few hours after the repair, our customer confirmed that his Friedrich air conditioner was once again operating quietly and efficiently , restoring a stable indoor temperature without excess energy consumption.
At AirGreen , every service call is an opportunity to demonstrate our expertise and rigor in the maintenance of residential and commercial HVAC systems.