A thorough cleaning intervention for optimal performance
At AirGreen , we are often called upon to work on Midea wall-mounted units that show signs of weakness after several seasons of use. This was the case during this service call in Sainte-Julie , on the South Shore of Montreal, where a customer noticed a marked decrease in the airflow and performance of his wall-mounted air conditioner.
Diagnosis: significant internal fouling
Upon arriving on site, our technician immediately noticed that the Midea wall-mounted unit had a significant buildup of dust and biofilm on the evaporator fins. This type of buildup, common after two to three summers without maintenance, prevents proper air circulation and can lead to:
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a drop in energy efficiency ,
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excessive electricity consumption ,
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a blocked condensate drain ,
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and in some cases, unpleasant odors .
After carrying out a complete electrical check (control board, blower motor and temperature sensors), we confirmed that no part was defective: the problem was solely due to a lack of maintenance .
Step 1: Prepare for cleaning
To avoid any water splashing on the walls and floor, our team installed a professional washing tarpaulin , specifically designed for maintaining wall units.
This protection, hermetically sealed under the device, allows the rinsing water to be channeled to a container via a drainage pipe.
This device, visible in the photo, is a safe pressure cleaning system - a method we systematically use during complete maintenance at our residential customers' homes.
Step 2: Deep Clean the Midea Unit
The technician then applied a biodegradable degreasing product to the evaporator, fins, turbine and inner casing.
Using a low pressure cleaner , all accumulated dirt, mold and particles were removed, restoring the heat exchanger to full exchange capacity.
This process includes:
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Cleaning the centrifugal fan , often overlooked, but crucial for static pressure.
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Disinfection of temperature sensors for more accurate readings.
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Flushing and unblocking the condensate drain , where a slight deposit of sludge had formed.
Step 3: Final checks and performance tests
Once the wash was complete, the unit was thoroughly dried and then tested under various fan speeds.
The airflow returned to normal and the blowing temperature quickly dropped to 7.8°C , confirming excellent performance.
We also measured the system's refrigerant pressure — everything was within the original Midea parameters , a sign that the compressor and refrigeration circuit were in perfect condition.
Result: restored comfort and reduced consumption
The customer immediately noticed a significant improvement in interior comfort : the air was fresher, the ventilation more uniform, and the operating noise significantly reduced.
In addition, thanks to this complete maintenance, your Midea air conditioner will regain optimal energy efficiency , extending its lifespan by at least several seasons.
Why Annual HVAC Maintenance Is Essential
Annual professional maintenance is the best way to ensure the performance and reliability of a Midea appliance—or any other brand.
At AirGreen, we recommend doing a complete cleaning before each summer , including:
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washing the evaporator and fan,
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checking the refrigerant gas pressure,
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cleaning the outdoor condenser,
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and inspection of wiring and drain.
These simple actions prevent 80% of the most common breakdowns, such as condensate leaks, ice formation or loss of power.
AirGreen Expertise in Sainte-Julie and on the South Shore
Our team serves Sainte-Julie, Boucherville, Brossard, Saint-Lambert and the entire South Shore for all your residential and commercial HVAC system repair, maintenance and installation needs.
Thanks to our status as an authorized Midea dealer and installer , we have direct access to original parts and the latest technical specifications of the wall units.
In summary
This professional cleaning of a Midea wall-mounted air conditioner in Sainte-Julie demonstrates that a simple preventative intervention can transform the performance of an HVAC system.
A well-maintained device is:
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better comfort ,
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an extended lifespan ,
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and energy savings throughout the year.
AirGreen — your HVAC expert in Montreal, Laval, Longueuil, North Shore and South Shore.
Repair, maintenance and installation of Midea, Fujitsu, Gree, Lennox, Goodman, Trane heat pumps and wall-mounted air conditioners, and more.