An essential intervention to restore the efficiency of an HVAC system
One Tuesday evening, our AirGreen team was called to an apartment in the Rosemont–La Petite-Patrie neighborhood of Montreal for a complete maintenance of a Midea wall-mounted air conditioner . The customer complained of a drop in performance: the blown air was lukewarm despite a temperature set at 20°C. He had also noticed a slight dusty odor and water leaking from the bottom of the wall, two clear signs of internal fouling in the system.
Initial diagnosis: a visible lack of maintenance
Upon removing the front of the wall-mounted unit, our technicians immediately noticed the condition of the evaporator module : the aluminum fins were partially clogged with a layer of dust and mold. In addition, the drainage tray showed dark, viscous deposits, a sign of prolonged water stagnation.
This type of fouling, common in urban areas like Montreal, significantly affects the energy performance of the HVAC system and increases electricity consumption.
Setting up a professional cleaning system
To ensure efficient, splash-free cleaning, our technician installed a waterproof wash bag specially designed for the wall-mounted units. This device channels water and cleaning products directly into a reservoir, preventing any splashing onto the walls or floor.
Using a biodegradable antibacterial cleaner , we sprayed the solution onto the evaporator, fins and turbine fan, before rinsing with warm water under low pressure.
This process eliminates:
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Microorganisms responsible for bad odors;
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Fine particles accumulated on the fins;
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Fatty deposits that impair heat exchange;
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And above all, obstructions in the condensate drain .
Checking the drainage and refrigeration circuit
After cleaning, the condensate pipe was checked using a small compressor. The water flow was again free, confirming that the drainage system was back in operation.
We then checked the pressure of the R-32 refrigerant used on this recent Midea model and it was found to be perfectly in line with the manufacturer's standards.
Post-interview performance test
Once the unit was reassembled, we restarted the air conditioner in cooling mode. The results were immediate:
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Blowing temperature: 7.8°C after 5 minutes of operation;
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More powerful and uniform airflow in the room;
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Completely odorless and quiet operation.
The customer, who had been using his system for three years without extensive maintenance, was impressed by the difference. His room temperature dropped from 26°C to 21°C in less than 15 minutes.
Why annual cleaning is essential
At AirGreen , we always remind our customers that annual cleaning of their wall-mounted air conditioner is much more than just a comfort measure. It is an essential step for:
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Preserve the energy performance of the system;
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Reduce electricity consumption by up to 20%;
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Extend the life of the compressor and internal components;
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Avoid premature failures due to fouling;
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Maintain healthy indoor air quality .
Recognized expertise in Montreal and on the North Shore
Our interventions, such as the one carried out in Rosemont–La Petite-Patrie, demonstrate our expertise in the cleaning and maintenance of residential HVAC systems .
Each AirGreen technician is trained to:
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Quickly diagnose the causes of reduced performance;
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Use environmentally friendly products;
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Guarantee a clean, safe and lasting result.
Whether you are in Montreal, Laval, Longueuil , or elsewhere on the North Shore and the South Shore , our mobile team travels with all the necessary equipment to ensure complete on-site maintenance.
Final result: an air conditioner like new
By the end of the repair, the customer's Midea unit was back operating at full capacity. The cold airflow was optimal, the ducts perfectly clean, and the condensate drain was flowing smoothly. Indoor comfort was instantly restored, with no odors or dampness.
This service call perfectly illustrates the importance of regular professional maintenance , especially before the summer season. At AirGreen, we guarantee fast, efficient, and transparent interventions, designed to restore each HVAC unit to its original performance.