A deep cleaning to restore performance and air quality
At AirGreen , every HVAC system maintenance is carried out with rigor and care. That day, our team traveled to Saint-Lambert , on the South Shore of Montreal , to perform a complete cleaning of a Fujitsu wall-mounted air conditioner . The customer had noticed a slight decrease in cooling power and a persistent damp smell when the unit was operating—typical signs of internal system fouling .
Initial diagnosis: accumulation of dust and biofilm in the indoor unit
As soon as the front cover was removed, the observation was clear: the evaporator fins were partially obstructed by dust and moisture spores .
This type of accumulation leads to:
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A loss of energy performance ,
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Reduced airflow ,
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And, in the long term, a deterioration in indoor air quality .
When we approached our humidity and stale air detector , the measurements confirmed the presence of microorganisms and minor molds —a common situation in systems that have not been maintained for more than two years.
Cleaning preparation: AirGreen method
To protect walls and furniture, we installed our waterproof washing cover specially designed for Fujitsu and Midea wall units .
This tarpaulin, connected to a drain hose, allows for intensive cleaning without splashing, even in the smallest rooms.
The preparation steps included:
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Power cut to secure the intervention.
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Removal of the front fairing, filters and ventilation turbine .
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Installing the wash bag and connecting the drain hose to a portable tank.
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Preparation of a biodegradable disinfectant and degreasing solution , suitable for residential HVAC systems.
Deep cleaning: complete removal of deposits
Using a pressure-controlled sprayer, our technician applied the solution to:
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The evaporator coil ,
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The condensate tray ,
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The ventilation turbine ,
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And the internal fins of the air diffuser .
The cleaning foam began to dissolve the organic deposits, then a gradual rinse helped flush the dirt down the drain.
In less than 20 minutes, the rinse water cleared , proof that the device was returning to its optimal condition.
Checking the drain and fan operation
Once the cleaning was complete, our team proceeded to fully inspect the condensate drain . A slight blockage had been detected at the pipe outlet—a possible cause of the slight water leaks reported by the customer.
After unblocking the pipe using a compressed air pump , we restarted the system to check:
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Airflow: perfectly restored,
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Noise level: reduced by almost 40%,
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Blowing temperature: lowered to 7°C in air conditioning mode .
Result: comfort and purified air in Saint-Lambert
Immediately after restarting, the customer noticed a noticeable improvement in air quality . The damp smell was completely gone, and the room cooled down faster than before.
This intervention demonstrates the importance of regular maintenance of wall-mounted air conditioners , particularly before summer, for:
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Prevent water leaks,
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Optimize electricity consumption,
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And extend the life of the compressor.
AirGreen Tips: Annual Preventative Maintenance
Our technicians recommend:
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A complete annual cleaning for intensively used devices,
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Replacing antibacterial filters every 12 months,
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And a refrigerant pressure check every two years to ensure consistent performance.
We also advised the customer to schedule an AirGreen maintenance contract , which includes:
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Inspection of the outdoor condenser,
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Cleaning the coils,
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Checking electrical connections,
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Condensate drainage test.
Expertise and reliability signed AirGreen
With our experience with Fujitsu, Midea, Gree, Sharp, Zephyr, Goodman and Trane brands, we are able to quickly diagnose and correct any problem related to the performance or air quality of an HVAC system.
Our interventions cover Montreal, Laval, Longueuil, the North Shore and the South Shore , always with the same rigor:
restored comfort, maximum energy efficiency and lasting peace of mind.
Conclusion
This intervention in Saint-Lambert perfectly illustrates the importance of regular professional maintenance .
By thoroughly cleaning every component of the Fujitsu wall-mounted air conditioner, AirGreen not only restored cooling power but also ensured healthy indoor air for the entire summer season.
Because a well-maintained system means lasting comfort and guaranteed energy efficiency.