A revealing service call: a wall-mounted air conditioner that was no longer cooling effectively
At AirGreen , we regularly repair Midea wall-mounted air conditioners throughout Sainte-Julie and the greater Montreal area. This specific case perfectly illustrates our rigorous approach and technical expertise when a residential air conditioning system experiences a loss of performance.
A customer on Rue de Normandie in Sainte-Julie contacted us after noticing that their Midea wall-mounted air conditioner was no longer maintaining a stable temperature. The unit was blowing lukewarm air, and slight condensation was appearing on the interior casing—a sign often linked to poor maintenance or a faulty refrigeration circuit.
Diagnosis: identify the source of the breakdown
Upon our arrival, our certified technician performed a complete inspection of the indoor unit. The top cover was opened to check:
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Condition of the evaporator : slightly clogged with accumulated dust.
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The air filter : clogged, reducing airflow and forcing the compressor to compensate.
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The tangential fan : in good condition, but slightly unbalanced.
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The temperature sensor (thermistor) : was showing unstable readings.
After measuring the pressure of the refrigerant gas (R-32), we noticed a slight leak at the liquid line connection . This leak, although minimal, was enough to explain the drop in efficiency.
Repair: precision and rigor
Our team undertook a complete repair of the refrigeration circuit , in several stages:
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Recovery of R-32 refrigerant according to environmental standards.
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Soldering the leaking connection using a silver alloy to ensure a seal.
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Nitrogen pressure test for 30 minutes to confirm no leaks.
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Accurate refrigerant filling , calibrated according to Midea manufacturer specifications.
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Complete cleaning of the evaporator and filter with a specialized biodegradable cleaner.
After restarting, the system returned to stable pressure and a blowing temperature of 7°C , indicating optimal performance. The customer immediately noted a return to comfort and a reduction in operating noise .
Signs of a Wall-Mounted Air Conditioner Needing Repair
Over the years, we have noticed that several symptoms frequently recur with Midea air conditioners :
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Warm air despite setting to cooling mode.
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Unusual noise (fan or compressor).
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Excessive condensation on the front panel.
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Flashing light or error code on the display.
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Bad smell when starting.
When these signs appear, it is important to avoid any risky handling. A professional diagnosis not only helps to target the exact cause of the problem, but also to extend the life of the device .
Maintenance: Key to long-term performance
This case highlights the importance of regular maintenance . We recommend our clients to:
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Clean air filters every 30 to 45 days.
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Have the refrigerant gas checked every 2 years.
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Schedule annual preventative maintenance before the summer season.
A well-maintained air conditioner can consume up to 20% less electricity and provide stable performance for more than 10 years. In Sainte-Julie, as elsewhere on the South Shore , many breakdowns can be avoided with a simple preventive visit from an AirGreen technician.
Why choose AirGreen for your Midea air conditioner repairs in Sainte-Julie
Our team is distinguished by:
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Certified technicians specialized in Midea systems.
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Rapid intervention throughout Sainte-Julie, Boucherville, Brossard and Longueuil.
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The use of latest generation diagnostic tools .
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A full guarantee on repairs carried out .
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Courteous, transparent and professional service.
At AirGreen, we understand that indoor comfort isn't a luxury, but a necessity—especially during Greater Montreal's sweltering summer heatwaves. Our goal is simple: to repair efficiently, sustainably, and affordably .
End result: a satisfied customer and an optimized system
At the end of the service, the customer was able to enjoy fresh air again, with no temperature fluctuations. Our technician took the time to explain proper maintenance practices, ensuring optimal operation for several seasons to come.
This type of intervention, typical of our daily operations in Sainte-Julie and on the South Shore , demonstrates AirGreen's ability to combine technical expertise and local proximity .
Every repair is an opportunity for us to build customer confidence while extending the useful life of their HVAC equipment.
At AirGreen , we are proud to bring Midea wall-mounted air conditioners back to life, a reliable system that deserves professional maintenance to deliver its full potential.
Areas served : Montreal, Laval, Longueuil, North Shore, South Shore.
Service offered : Repair, maintenance, installation, diagnosis of residential and commercial HVAC systems.