Deep Cleaning for a Dirty HVAC System
At AirGreen , we were commissioned in Plateau-Mont-Royal to perform a complete maintenance on a Fujitsu wall-mounted air conditioner . The client, the owner of an older apartment with period wood moldings, had noticed a noticeable decrease in airflow and a persistent damp odor when the unit was turned on. These typical signs indicated a buildup of dust, mold, and bacteria on the coils and indoor fan.
The intervention took place in a typical residential environment of the Plateau: plaster walls, original woodwork and hot water radiators - a context requiring particular care to avoid any splashing of water or cleaning products.
Step 1: Site preparation and environmental protection
Before beginning the cleaning process, our technicians carefully protected the surrounding surfaces : curtains, walls, floor, and woodwork. The Fujitsu wall unit was equipped with a professional waterproof cleaning bag to direct the rinse water into a collection container.
This method, systematically used by our AirGreen teams, guarantees clean and safe maintenance , without splashes or infiltration into the walls.
Step 2: Initial Diagnosis and Disassembly
After turning off the circuit breaker, we removed the front panel, filters, and air direction fins. A visual inspection revealed:
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Significant fouling of the evaporator coil , obstructed by dust and pollen.
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A buildup of mold on the blower turbine.
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Traces of stagnant moisture in the condensate tray.
The customer had not had the unit cleaned for over three years, too long an interval for this type of wall-mounted system exposed to heavy seasonal use.
Step 3: Chemical cleaning and disinfection
We applied a specialized biodegradable HVAC coil cleaner , designed to dissolve grease and dirt without damaging the aluminum fins.
A soft anti-static brush was used to dislodge the accumulated particles, followed by a low-pressure rinse to prevent any infiltration towards the electronic board.
The condensate tray and drain pipe were cleaned and rinsed, then disinfected with a bactericidal solution approved by Health Canada.
Next, the blower turbine was removed and thoroughly washed—a crucial step often overlooked, but essential to eliminate sources of odors and mold spores .
Step 4: Technical verification and performance testing
Once the cleaning was complete, all components were reassembled and dried with hot air. We then carried out a series of tests:
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Airflow measured before and after maintenance: 37% improvement.
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Blowing temperature : lowered to 9.2°C, proof of better heat exchange efficiency.
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Noise level : reduced by 4 dB after complete cleaning of the fan.
The Fujitsu unit has returned to smooth, quiet and efficient operation.
Step 5: Personalized advice for lasting maintenance
Before leaving the premises, our AirGreen technicians provided several preventive recommendations to the client:
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Clean air filters every 30 days during the warm season.
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Schedule a complete professional interview every spring .
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Maintain indoor humidity levels between 40% and 55% to reduce mold growth.
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Avoid using chemical deodorizers on wall units, which can impair thermal sensors.
We also reminded the customer that regular HVAC maintenance not only extends the life of the system, but also reduces electricity consumption by up to 20%.
Result: purified air and restored comfort
Thanks to this meticulous intervention , the ambient air in the apartment has regained its original freshness. The Fujitsu wall-mounted air conditioner now operates at optimal efficiency , without odor or excessive noise, ensuring the client lasting summer comfort in their Plateau-Mont-Royal home.
At AirGreen , we make it a point of honor to offer HVAC cleaning and maintenance services that meet the most demanding standards — throughout Montreal, Laval, Longueuil, on the North Shore and the South Shore .