A typical service call turned into an AirGreen HVAC success story
At AirGreen , we work every day in homes on the South Shore , Montreal , and Laval to diagnose and repair heating, ventilation, and air conditioning (HVAC) systems. One of our recent calls to Sainte-Catherine perfectly illustrates our meticulous and human approach: an efficient, clean, and durable repair of a Midea wall-mounted air conditioner .
The context: a wall system that was no longer cooling efficiently
Our client, the owner of a modern semi-detached house in Sainte-Catherine, contacted us after noticing that his Midea wall-mounted air conditioner was no longer reaching the set temperature. The indoor unit was displaying a temperature of 23°C , but the air blown out remained lukewarm, even after several minutes of operation.
Upon arrival, our technicians Marc and Éric carried out the first checks:
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The outdoor unit was running normally.
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No error codes were displayed on the wall unit.
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The filter looked clean at first glance.
These clues suggested a refrigerant pressure problem or a temperature sensor malfunction .
The diagnosis: a lack of R-32 refrigerant caused by a microleak
Using our digital pressure gauge and electronic leak detector, we confirmed a pressure drop on the low line . After careful inspection of the refrigeration circuit, the leak was coming from a slightly cracked crimp on the copper line leading to the indoor unit.
We then have:
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Recovered the remaining gas using our certified recovery station.
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Repaired the leak by cutting out the damaged section and silver soldering .
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Performed a deep vacuum of 500 microns.
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Recharged the system with the exact amount of R-32 , according to Midea specifications.
After restarting, the pressure stabilized and the cold air flow immediately improved.
The result: restored performance and reassured customer
Within the first minute of testing, the blowing temperature dropped from 24°C to 12°C , a sign of a return to optimal performance. The customer was able to see the difference instantly:
“It’s night and day! My living room has never cooled down so quickly.”
Our technicians took advantage of the visit to:
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Clean the air filters and the tangential fan .
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Disinfect the internal exchanger with a biodegradable antibacterial solution.
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Explain to the customer the importance of annual preventative maintenance , particularly before heat waves.
AirGreen expertise: precision, transparency and reliability
This case perfectly illustrates our philosophy: every repair must aim for durability and performance . Our teams never simply “restart” a device—they identify the root cause , ensuring consistent comfort for several seasons.
We also documented the intervention with photos and added a service note in our system to ensure follow-up during the next maintenance.
Some tips to avoid this type of breakdown
Our experts often share these recommendations with our clients:
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Clean the filters once a month during the summer.
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Avoid extension cords : always plug the unit into a dedicated circuit.
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Watch for abnormal noises or temperature variations.
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Schedule an annual maintenance before the warm season—ideally between April and June.
These simple actions extend the life of your wall-mounted air conditioner and ensure stable energy consumption.
Why choose AirGreen for your HVAC repairs?
We operate throughout the South Shore , Montreal , Laval , the North Shore and their surrounding areas, always with the same promise:
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Accurate diagnosis , based on professional tools.
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Complete transparency on costs and parts replaced.
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Certified technicians with ongoing training on new generations of devices, including R-32 refrigerant models.
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Fast and courteous service , even during periods of high demand.
In conclusion
The service call in Sainte-Catherine resulted in a complete repair and a fully satisfied customer. The Midea wall-mounted air conditioner is now operating at full capacity, providing consistent, quiet comfort.
At AirGreen , every intervention is an opportunity to demonstrate our know-how and our commitment to quality, customer respect and sustainable performance.