Repair of a Midea wall-mounted heat pump in Sainte-Anne-de-Bellevue

Precision diagnosis and perfectly restored temperature thanks to AirGreen

At AirGreen , our team of HVAC technicians was recently called for repair service on a Midea wall-mounted heat pump installed in a modern home in Sainte-Anne-de-Bellevue , on the west side of Montreal. The customer had noticed a drop in performance for several days: the indoor unit was blowing lukewarm air despite a setpoint of 20°C. This is a typical situation that can hide several possible causes—from a lack of refrigerant to a sensor or electronic board problem.

Initial on-site observation

Upon our arrival, our technician began with a complete assessment of the Midea system .

• Ambient temperature in the room: 23.8°C .

• Temperature measured at the air outlet using an infrared thermometer: 15.6°C (see image).

This temperature difference was not sufficient to ensure optimal performance of the heat pump . Cooling needed to be more pronounced, ideally around 10°C difference.

Inspection of the refrigeration circuit

We checked the refrigerant level outside. The compressor was running, but the pressure reading indicated a slightly lower charge than normal . This could explain the excessively high blowing temperature. After performing a nitrogen leak test, no microleaks were detected.
➡️ The problem therefore probably came from a micro-loss of charge over time , typical after several years of use.

Repair carried out

1. Recovery of remaining refrigerant in order to work in safe conditions.

2. Complete system recharge according to Midea specifications (R410A type, exact quantity according to the nameplate).

3. Complete cleaning of the interior turbine and exterior condenser.

4. Checked the evaporator temperature sensor , which was slightly dirty, distorting the temperature reading.

5. Recommissioning and electronic calibration of the control module.

Results obtained

After recharging and calibration:

• Air outlet temperature: 7.2°C .

• Ambient temperature stabilized at 21°C in less than 20 minutes.

The 14°C difference in airflow demonstrated optimal performance. The customer immediately noticed a significant improvement in interior comfort.

Explanations and advice given to the customer

We took the time to explain to the owner the importance of regular maintenance to avoid a gradual decline in performance:

• Clean filters every 4 to 6 weeks.

• Annual inspection of refrigerant level and outdoor fan operation.

• Watch for warning signs such as: warm air, unusual noise, excessive condensation, or slow starting.

AirGreen expertise: efficiency, precision and transparency

Each AirGreen intervention is based on a rigorous methodology:

• Use of professional measuring tools (such as the infrared thermometer seen in the photo).

• Diagnosis based on real and comparative data.

• Detailed report provided to the client to ensure transparent and documented monitoring .

This approach not only restores equipment performance, but also significantly extends its lifespan — an undeniable economic and ecological advantage .

Why choose AirGreen for your HVAC repairs in Montreal and the West Shore?

• Certified and specialized technicians Midea, Fujitsu, Gree, Sharp, Lennox, Goodman and several other brands.

• Fast service covering the entire Greater Montreal Region : Sainte-Anne-de-Bellevue , Dorval , Pointe-Claire , Lachine , Laval , Longueuil , North Shore and South Shore .

• Warranty on the repair carried out and parts used.

• Complete transparency of diagnostics, without forced sales or hidden costs.

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Summary of the intervention

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Conclusion

Thanks to a quick and methodical intervention, AirGreen was able to restore the performance of a Midea heat pump in a single visit. The system is now operating at full capacity, providing the customer with optimal comfort, improved energy efficiency, and renewed peace of mind.

At AirGreen, we put our expertise at the service of your comfort, throughout Montreal and the surrounding area.