Repair of a Midea wall-mounted heat pump in Côte-des-Neiges

An intervention on the roofs of Montreal: efficiency and precision signed AirGreen

At AirGreen , we regularly work in demanding urban environments, where restricted access and installation constraints require proven technical expertise. This week, our team was called in to repair a Midea wall-mounted heat pump installed on the rooftop of a residential building in Montreal's Côte-des-Neiges neighborhood.

The customer had noticed a gradual decline in the performance of her system: the unit was no longer cooling properly and an unusual noise was coming from the outdoor compressor.

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Diagnosis: A refrigeration connection problem and deferred maintenance

Upon arriving on site, our certified technician first carried out a complete inspection of the outdoor condenser , securely mounted on a metal structure. The first observation: a slight oozing of oil at the refrigerant line connections , a clear sign of a micro-leak of R-32 refrigerant .

The unit, a Midea single-zone 12,000 BTU wall-mounted model, also had dust buildup on the heat exchanger, reducing heat transfer. Internally, the wall-mounted unit's temperature sensor appeared to be corrupted, causing an improper defrost cycle .

We have therefore established a three-step intervention plan:

1. Locate and repair the micro-leak at the flare fittings.

2. Replace the defective probe with an original Midea part.

3. Clean and recalibrate the system to restore its optimal performance.

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Repair: precision and safety on the roof

Working on a building roof in Montreal requires strict safety measures. Our technicians first secured the area with harnesses and non-slip supports. Next, the refrigerant connection was disassembled, cleaned, and rebuilt with a new flare and tightening torque calibrated to the manufacturer's specifications.

Once the leak is repaired, we have:

• pulled a full vacuum at -30 inHg for 25 minutes ,

• injected the R-32 refrigerant at the exact nominal charge,

• tested operating pressure (125 psi in cold mode, stable),

• and checked the compressor inrush current , in accordance with the technical data sheet.

The indoor temperature sensor was then replaced, and a full operating cycle confirmed a return to nominal performance.

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Result: comfort restored and performance optimized

After our intervention, the customer noticed uniform and quiet cooling from the first minutes. The system returned to optimal energy efficiency, with a delta T of 10°C between intake and exhaust, perfectly within the standards for a Midea device.

We also took the time to remind you of some good preventive maintenance practices :

• cleaning the internal filter every 2 months,

• annual professional inspection,

• checking the tightness of the refrigeration connections,

• clearance from the outdoor unit (minimum 30 cm around).

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AirGreen expertise: a complete and rigorous service

Every HVAC repair we carry out, whether in Montreal , Laval , Longueuil , on the North Shore or the South Shore , has the same objective: to ensure the durability, performance and safety of our customers' systems.

We make it a point of honor to:

• diagnose accurately before any intervention,

• use only original parts from manufacturers,

• and provide a detailed report to the customer after each repair.

This approach sets us apart in the residential HVAC market in Montreal and contributes to the lasting satisfaction of our customers.

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Conclusion: Another Midea system saved by the AirGreen team

Thanks to a quick and methodical intervention, our client's Midea wall-mounted heat pump in Côte-des-Neiges is now operating at full capacity. This type of service demonstrates our commitment to the quality , transparency , and reliability of our interventions.

For any wall-mounted heat pump , air conditioner , or central HVAC system repair needs, trust the AirGreen team — your trusted partner for lasting comfort, summer and winter.