Repair of a Midea wall-mounted heat pump in Rosemont–La Petite-Patrie

A typical service call in a Montreal duplex

At AirGreen , we work weekly in typical Montreal residential buildings, such as this brick duplex located in the Rosemont–La Petite-Patrie sector. The client contacted us after noticing that their Midea wall-mounted heat pump was no longer producing heat, despite a complete restart and filter cleaning.

Upon our arrival, our certified technician noted an outdoor unit installed high up , securely mounted on a galvanized steel wall bracket—a common configuration for Montreal semi-detached homes to prevent snow accumulation.

Diagnosis: loss of performance linked to a refrigerant leak

After checking the power supply , outdoor fan and refrigeration circuit pressures , our measurements revealed a lower than normal pressure, confirming an R-32 refrigerant leak . This type of leak can occur at the flare fittings or the compressor outlet when vibrations accumulate over the seasons.

Our diagnostic steps included:

• Visual inspection of refrigerant lines and casing.

• Electronic leak detection using a halogen detector.

• Checking the condenser coil and protective cover.

The leak point was located on a poorly sealed connection at the service fitting , probably weakened by freeze and thaw cycles.

Complete repair and return to service

Our technicians carried out the following operations:

1. Safe recovery of remaining gas using our certified recovery station.

2. Replacement of the flare fitting and application of a specialized sealing compound .

3. Complete vacuuming of the circuit to eliminate moisture.

4. Recharge the system with R-32 refrigerant according to the manufacturer's specifications.

5. Performance test in heating and cooling mode to ensure optimal air pressure and flow.

Result: the Midea heat pump has regained its full efficiency, with an indoor/outdoor temperature delta of 11°C in heating mode, in line with expectations for a 12,000 BTU model.

AirGreen Expertise: The Difference in the Details

Our teams work daily on a variety of HVAC systems in the greater Montreal area, Laval, the North Shore, and the South Shore . What sets AirGreen apart is our rigorous approach: every service call is treated as an opportunity to maximize the system's lifespan while improving customer comfort .

In this specific case, we also have:

• Checked the condensation water flow and cleaned the drain pipe.

• Inspected the interior fan for dust deposits.

• We recommend that the customer have an annual preventive maintenance , ideally in spring or autumn.

Tips to avoid this type of breakdown

A refrigerant leak is often gradual and can go unnoticed. Here are our recommendations for Midea wall-mounted heat pump owners:

• Have the refrigeration connections checked every two years.

• Clean the indoor unit filters regularly.

• Make sure the wall mount is stable and free from corrosion.

• Monitor for any abnormal noise or loss of performance .

A well-maintained heat pump can last up to 15 years , while maintaining excellent energy efficiency.

Comfort restored, customer satisfied

Once the repair was completed, our customer noticed a rapid temperature rise and quiet operation, just like the original installation. The intervention was completed in less than 90 minutes , demonstrating the speed and expertise of our team.

At AirGreen , we are committed to providing reliable, fast and durable HVAC repair service, whether for Midea, Gree, Fujitsu, Sharp, Lennox or Goodman heat pumps, throughout Montreal , Laval , and on the North and South Shores .