A service call in a typical Plateau apartment
At AirGreen , we regularly receive calls from older buildings in Montreal's Plateau-Mont-Royal , where Fujitsu wall-mounted air conditioners keep occupants comfortable during hot weather. In this case, our client contacted us because their wall-mounted air conditioner was no longer cooling efficiently , emitting intermittent noise and appearing to suffer from abnormally low airflow .
On-site diagnosis: dust accumulation and clogged fan
The indoor unit, installed just above a casement window in a living room converted into a music space, showed several signs of wear and dirt :
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saturated air filters,
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coil fins clogged with dust,
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fan turbine slightly unbalanced,
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visible accumulation of deposits near the condensate drain.
The customer had noticed an increase in his electricity consumption and a gradual slowdown in cooling capacity , two common symptoms when air circulation is compromised.
Steps of the intervention: cleaning, disinfection and rebalancing
Our technicians first secured the workstation and protected the furniture, including the electronic keyboard located under the unit. After turning off the power, we dismantled the front panel and removed the filters for dry cleaning with warm soapy water .
Next, a specialized AirGreen biodegradable cleaner was applied to the evaporator coil , dissolving the layer of dirt and restoring heat exchange. The internal turbine was disassembled, disinfected and reinstalled after careful rebalancing to eliminate the reported intermittent noise.
The condensate drain was also purged with a hand pump: a small dust plug was blocking the drain, risking causing water leaks on the interior wall in the long term.
Electrical verification and performance test
After cleaning and reassembly, our team carried out a complete check of the electrical system :
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stable supply voltage,
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communication between the main board and the IR module,
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calibration of the ambient temperature sensor.
The final test showed a temperature difference of 9.8°C between the incoming and outgoing air—evidence of restored thermal efficiency . Noise measured at 1 meter distance returned to 25 dB , in line with Fujitsu standards.
Result: a quiet, efficient system and a satisfied customer
The intervention allowed to restore thermal comfort in the apartment without replacing expensive parts. The client immediately noticed the reduction in noise and the rapid cooling .
We recommended annual professional maintenance , which is essential for wall-mounted appliances installed in dusty urban environments like the Plateau.
AirGreen Tips to Extend the Life of Your Wall-Mounted Air Conditioner
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Clean the filters every 4 to 6 weeks during the summer season.
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Avoid obstructing airflow : keep 20 cm free around the unit.
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Have the condensate drain checked at each maintenance to prevent leaks.
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Call a certified RBQ/CCQ technician for any unusual noise, odor, or drop in performance.
AirGreen expertise, the benchmark in HVAC maintenance in Montreal
Working in older housing in the Plateau-Mont-Royal requires a careful approach: restricted access, limited height and aesthetic constraints.
At AirGreen, we tailor our HVAC maintenance and repair methods to each situation—whether it's a Fujitsu wall-mounted air conditioner , a Sharp multi-zone heat pump , or a Midea central system .
Our commitment: to offer a reliable, sustainable and clean service , everywhere in Montreal, Laval, Longueuil, on the North Shore and the South Shore .