Midea wall-mounted air conditioner repair in Sainte-Catherine

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 .

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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:

• The outdoor unit was running normally.

• No error codes were displayed on the wall unit.

• The filter looked clean at first glance.

These clues suggested a refrigerant pressure problem or a temperature sensor malfunction .

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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:

1. Recovered the remaining gas using our certified recovery station.

2. Repaired the leak by cutting out the damaged section and silver soldering .

3. Performed a deep vacuum of 500 microns.

4. 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.

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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:

• Clean the air filters and the tangential fan .

• Disinfect the internal exchanger with a biodegradable antibacterial solution.

• Explain to the customer the importance of annual preventative maintenance , particularly before heat waves.

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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.

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Some tips to avoid this type of breakdown

Our experts often share these recommendations with our clients:

• Clean the filters once a month during the summer.

• Avoid extension cords : always plug the unit into a dedicated circuit.

• Watch for abnormal noises or temperature variations.

• 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.

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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:

• Accurate diagnosis , based on professional tools.

• Complete transparency on costs and parts replaced.

• Certified technicians with ongoing training on new generations of devices, including R-32 refrigerant models.

• Fast and courteous service , even during periods of high demand.

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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.