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Réparation d’une Thermopompe Murale Midea à Rosemont–La Petite-Patrie
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Repair of a Midea Wall-Mounted Heat Pump in Rosemont–La Petite-Patrie

AirGreen intervention for a dirty outdoor unit and loss of efficiency

A recent service call took us to Rosemont–La Petite-Patrie , in the heart of Montreal, to diagnose a Midea wall-mounted heat pump that was showing a noticeable loss of performance . The customer had been observing irregular cooling and an unusual vibrating noise coming from the outdoor compressor installed on a wooden support at the gravel-covered roof terrace for several weeks.

Initial Diagnosis: Symptoms of Neglected Maintenance

From our visual inspection, we noticed several revealing elements:

  • Significant accumulation of dust and foam on the external battery;

  • Blocked exchanger fins , preventing good air circulation;

  • Slightly unstable wooden support , causing vibrations and mechanical noise;

  • Lack of debris protection at the airflow inlet.

Refrigeration pressure readings indicated a drop in refrigerant charge , probably a consequence of a micro-leak linked to a slightly loose connection at the service valve.

Repair and maintenance steps

Our certified technicians proceeded methodically to restore the Midea system to full performance :

  1. Power off and secure the electrical circuit.
    We started by checking the condition of the connections and power cables.

  2. Complete cleaning of the outdoor condenser.
    Use a professional biodegradable cleaner to remove dirt, moss and debris.
    Result: immediate improvement in airflow.

  3. Tightening of refrigeration connections and leak testing.
    A micro-leak was identified at the liquid line junction. After correction, the circuit was put back under vacuum to eliminate any traces of moisture.

  4. Midea R410A refrigerant recharge at nominal pressure.
    Accurate calibration according to manufacturer's recommendations.

  5. Realignment and stabilization of the support.
    The wooden base has been fitted and secured with anti-vibration pads to eliminate operating noise.

  6. Checking overall operation.
    After restarting, the heat pump regained constant airflow, stable performance and quiet operation.

Results: restored comfort and improved energy efficiency

At the end of the intervention, performance measurements demonstrated:

  • A 25% performance gain compared to the arrival values;

  • An indoor blown air temperature in accordance with Midea specifications;

  • Significant reduction in external noise thanks to support stabilization.

The customer was able to observe a rapid return to optimal comfort , while reducing the load on the compressor - thus ensuring a prolonged life of the system .

AirGreen Maintenance Tips for Midea Heat Pump Owners

To avoid future inconvenience, our experts recommend:

  • A complete spring maintenance and pre-winter inspection ;

  • Clean the internal filters every 4 to 6 weeks;

  • Avoid the accumulation of vegetation or dust around the condenser;

  • Monitor vibrations : a poorly secured bracket can cause premature damage to the compressor;

  • Schedule annual AirGreen maintenance , including checking the refrigerant, sensors and electronic board.

AirGreen expertise in Montreal and across the North Shore

At AirGreen , we operate every day in Montreal, Laval, Longueuil, on the North Shore and the South Shore , to diagnose and repair all types of residential and commercial HVAC systems .
Our technicians have extensive expertise in Midea heat pumps , as well as Fujitsu, Gree, Sharp, York, Goodman, Zephyr and Trane brands.

Every intervention follows a rigorous approach: precise analysis, lasting repair and total transparency . Our priority always remains the reliability and performance of your system — for uninterrupted comfort, summer and winter.

Conclusion: efficiency restored and customer satisfied

Thanks to this meticulous intervention on the Midea wall-mounted heat pump in Rosemont, the system has returned to optimal and silent operation.
This case perfectly illustrates AirGreen's mission: to combine technical know-how, compliance with HVAC standards and exemplary customer service .

AirGreen — HVAC repair and maintenance experts in Montreal, Laval, North Shore and South Shore.
We bring your Midea systems back to life with precision, reliability and passion for our work.