When a wall-mounted air conditioner loses performance: an AirGreen intervention in Côte-des-Neiges
At AirGreen , we are regularly called to diagnose performance problems or abnormal temperature on wall-mounted air conditioning units . This was precisely the case during this intervention in Côte-des-Neiges–Notre-Dame-de-Grâce , in a Montreal apartment where the customer noticed a significant drop in the cooling power of his Ecolo wall-mounted air conditioner .
Symptoms observed
The customer contacted us after noticing that, despite a 21°C setting, the room temperature wouldn't drop below 26°C. Additionally, the indoor unit seemed to be blowing warm air rather than cold. On site, our technician took an initial temperature measurement using an infrared thermometer , recording an air outlet of 24.9°C —a clear sign that the system wasn't working properly.
Diagnosis: the AirGreen method
Our experts always follow a rigorous diagnostic process to isolate the exact cause of the problem:
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Check air filter : slightly clogged, reducing airflow.
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Evaporator coil inspection : dust accumulation and light frost film.
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Refrigerant pressure measurement (R-410A) : level below standard — sign of a small leak in the refrigeration circuit.
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Condensate drain check : slight water backflow due to algae buildup.
These four observations combined perfectly explained the loss of cooling performance.
Repair and refurbishment
To restore the full efficiency of the Ecolo wall-mounted air conditioner, our technician carried out a series of specific interventions:
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Complete cleaning of the coil and interior housing with an Ecolo approved biodegradable cleaner.
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Replace the filter with a compatible HEPA model to improve indoor air quality.
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Repair of the refrigerant leak on the flare connection, followed by a nitrogen leak test .
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Recharge with R-410A refrigerant until the manufacturer's recommended pressure rating is reached.
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Cleaning the drain and applying an antibacterial treatment to prevent any future obstructions.
Once the intervention was completed, the air outlet temperature was measured at 11.7°C , confirming a return to optimal performance.
Result: restored comfort and maximized energy efficiency
Within minutes of restarting, the apartment's ambient temperature dropped rapidly, restoring the desired comfort. The customer immediately noticed the difference: a more powerful blower , fresher air , and stabilized energy consumption .
At AirGreen, we always emphasize the importance of annual preventative maintenance to avoid this type of breakdown, especially before Montreal's heatwaves. A simple check-up at the beginning of summer can save time, money, and discomfort.
AirGreen Tips to Extend the Life of a Wall-Mounted Air Conditioner
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Clean the air filters every 3 to 4 weeks during the summer season.
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Avoid setting the temperature too low: excessive variation increases condensation.
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Schedule a professional interview every spring.
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Watch for signs of poor performance: warm air, abnormal noises, odors, or leaking water.
Why trust AirGreen
Working on a wall-mounted HVAC system requires precision and expertise. Our certified technicians are fully familiar with the most popular brands in Montreal , including Ecolo, Gree, Fujitsu, Midea, Sharp, and Lennox . We use professional diagnostic tools, such as infrared thermometers and digital pressure gauges , to ensure fast and reliable diagnosis.
Our goal is simple: to offer each customer in the Greater Montreal Region, Laval, Longueuil, the North Shore and the South Shore , a fast, efficient and durable HVAC repair service.
An exemplary intervention by AirGreen
Thanks to this meticulous repair, the Côte-des-Neiges customer now enjoys restored thermal comfort, without increasing his electricity bill. Another successful HVAC repair that demonstrates our expertise and our commitment to quality and customer satisfaction.