Home » Some of Our Service Calls in Greater Montreal » Midea wall-mounted air conditioner repair in Côte-des-Neiges
Réparation d’un climatiseur mural Midea à Côte-des-Neiges
Reading time: 4'

Midea wall-mounted air conditioner repair in Côte-des-Neiges

An AirGreen intervention to restore summer comfort in a Montreal apartment

At AirGreen , we work every day in the neighborhoods of Montreal , Laval , Longueuil , as well as on the North Shore and the South Shore , to bring back to life the heating, ventilation and air conditioning (HVAC) systems that ensure the comfort of our customers.
Recently, our team visited a residential building in the Côte-des-Neiges neighborhood of Montreal for a service call regarding a Midea wall-mounted air conditioner that was no longer effectively cooling the air in the apartment.

Diagnosis: Loss of performance and dust accumulation

Upon arrival, the customer reported that the unit was making a slight humming noise and that the cold airflow seemed to have been significantly reduced for several days.
After a quick visual inspection, we found that:

  • The outdoor unit, installed on a covered balcony, was clogged with dust and debris .

  • The heat exchanger fins had a buildup of dirt limiting heat dissipation.

  • The condensate drain was partially blocked, causing water to back up inside the sump.

  • The compressor inrush current was slightly above the norm, indicating increased engine strain.

Step 1: Complete cleaning of the outdoor condenser

We first performed a deep cleaning of the outdoor unit using a biodegradable product designed for HVAC coils.
Each fin was carefully brushed, then rinsed under low pressure to avoid any deformation.
This cleaning immediately improved airflow around the condenser—a critical factor in maintaining optimal refrigerant pressure.

Step 2: Checking the refrigeration circuit and compressor

The Midea model installed here was a 12,000 BTU wall-mounted air conditioner , running on R-410A refrigerant .
After restarting, we observed the operating pressures: they were slightly lower than the norm.
Using our electronic detector, we then checked the circuit for leaks — no leaks were detected.

However, the compressor discharge temperature was found to be a little high, a direct consequence of accumulated dirt and prolonged thermal stress.
A minimal additional refrigerant charge was added to bring pressures back to an optimal level.

Step 3: Cleaning the drain and interior coil

Secondly, our technician accessed the indoor unit to clean the evaporator coil and unclog the drain pipe using a mini air compressor.
The flow of condensation water was quickly restored, confirming the proper functioning of the drainage system.
We then replaced the very dirty air filter with an original Midea model, thus guaranteeing optimal air flow and quality.

Result: a refurbished air conditioner

As soon as we finished our intervention, the Midea unit was again blowing cold, dry air, with an outlet temperature measured at 10°C — perfectly within the standards for efficient operation.
The customer immediately noticed a difference: the compressor noise had stabilized , and the room reached its set temperature in less than ten minutes.

Maintenance tips we shared with the customer

At AirGreen, we believe that good preventative maintenance is the key to a sustainable and efficient system.
Here are some recommendations we left for the owner:

  1. Clean the air filters every two months during the summer season.

  2. Check the outdoor unit at the beginning of each summer to ensure no debris is blocking the ventilation.

  3. Avoid hanging objects too close to the condenser, especially in confined spaces such as balconies.

  4. Schedule annual professional maintenance to maintain the manufacturer's warranty and optimize energy performance.

Fast and professional service throughout Montreal

This intervention in Côte-des-Neiges perfectly illustrates our commitment: to intervene quickly, diagnose accurately and extend the lifespan of HVAC devices .
Our certified technicians travel everywhere — from Laval to Brossard , from Terrebonne to Saint-Lambert — to offer transparent, meticulous and lasting service.

No matter the make or model, AirGreen is your trusted partner for the repair, maintenance, and installation of Midea, Gree, Fujitsu, Sharp, Mitsubishi, Goodman, and many other systems .