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Réparation d’une thermopompe murale Midea à Ville-Marie
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Repair of a Midea wall-mounted heat pump in Ville-Marie

When performance meets expertise: AirGreen's rapid intervention in the heart of Montreal

At AirGreen , we are often called upon to work in downtown apartment buildings where wall-mounted heat pumps provide comfort for entire apartments, even in tight spaces. This time, our team traveled to the Ville-Marie neighborhood in the heart of Montreal to diagnose and repair a Midea wall-mounted heat pump installed on the second floor of a typical downtown brick building.

Context of the service call

The client, the owner of a rental condo, contacted us after noticing that his heat pump had not been producing cold for several days. Despite the apparent operation of the indoor fan, no fresh air was circulating and the room temperature remained uncomfortable. In addition, the outdoor compressor seemed to be emitting an irregular noise , accompanied by a slight vibration that could be heard through the brick wall.

In this type of urban environment, where outdoor units are often installed high up on metal supports, mechanical stress and vibrations can accelerate certain breakdowns.

Technical diagnosis: identify the cause of the problem

Our certified technicians performed a complete diagnostic of the Midea system. Here are the main steps:

  1. Visual and auditory inspection of the outdoor unit — we noticed a buildup of dust and debris around the condenser and intermittent noise coming from the compressor.

  2. Checking refrigerant pressures — the pressure gauge indicated abnormally low pressure, a clear sign of a refrigerant leak .

  3. Leak test — by injecting a fluorescent tracer, we were able to locate the leak on a solder at the liquid line connection , probably weakened by the vibrations of the wall bracket.

  4. Electronic board check — the control board had a slight delay in compressor activation, a secondary consequence of an imbalance in the refrigerant circuit.

Intervention: repair and complete return to service

Once the diagnosis was confirmed, our team undertook a complete repair according to industry standards:

  • Soldering of the defective joint using a high-strength alloy, perfectly suited to Midea copper pipes.

  • Complete vacuum test of the circuit to eliminate all traces of humidity and guarantee a perfect seal.

  • Recharge R-410A refrigerant according to the manufacturer's factory specifications.

  • Complete cleaning of the outdoor condenser to restore optimal airflow.

  • Final check of pressures and power consumption , ensuring normal operation of the compressor and evaporator.

Once the repair was complete, we tested the system in both heating and cooling modes to confirm proper operation of the expansion and compression cycles.

Result: restored comfort and improved efficiency

Within minutes of restarting, the interior temperature began to drop rapidly. The customer immediately noticed a noticeable difference in the system's airflow and sound stability .

We also securely fastened the wall bracket with anti-vibration screws and added damping pads to reduce noise transmission into the brick—an often overlooked detail, but essential in a dense urban environment like Ville-Marie.

The result:

  • A Midea heat pump that is once again as quiet as it is efficient.

  • Optimized energy consumption thanks to perfectly calibrated gas pressure.

  • A customer reassured by the durability of the repair and the maintenance advice we provided.

Maintenance tips to prevent future breakdowns

We recommend to all owners of wall-mounted heat pumps in Montreal :

  • Clean the interior filter every month during the air conditioning season.

  • Have the refrigerant pressure checked every two years by a certified technician.

  • To check wall supports and copper joints, especially in installations exposed to external vibrations.

These simple actions extend the life of your device and maintain stable performance throughout the year.

AirGreen expertise serving downtown Montreal

Downtown brick buildings, with their metal structures and tight spaces, require specialized HVAC expertise . At AirGreen, we combine accurate diagnosis , on-site repair , and proactive prevention to ensure the reliability of every system, whether residential or rental.

Thanks to our in-depth knowledge of Midea, Fujitsu, Gree, Sharp, Zephyr and Mitsubishi systems , we intervene quickly everywhere in Montreal, Laval, Longueuil, on the North Shore and the South Shore , with the same technical rigor and the same human approach.