In many apartments and houses in the Rosemont–La Petite-Patrie area, wall-mounted heat pumps work hard year-round: providing air conditioning in the summer, supplemental or primary heating in the colder months, and daily air filtration. Over time, one observation often arises during our interventions at AirGreen: even if the unit is "working," the interior can accumulate a significant amount of dust, lint, and organic deposits.
The photo we received clearly shows a disassembled indoor unit (cover, grilles, and access to the coil), with a significant accumulation of dirt around the louvers , suction areas , and especially the fan/impeller (the typical thick deposits that eventually reduce airflow and promote odors). This is exactly the kind of situation where simply rinsing the filters is no longer sufficient: a thorough, methodical, and safe cleaning is required.
Machine type and identification (consistent with the image)
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Type : Wall-mounted heat pump (mini-split / wall unit)
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Brand (supplied manually, therefore priority) : Fujitsu
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Model (consistent with the range, not visible in the photo) : Fujitsu Altair 500 (KPAS – R-32) , or equivalent of the same generation
Even when the exact model is not legible, the cleaning method remains the same: the procedure is adapted to the internal configuration (condensation tank, turbine access, coil shape, type of drains) and the recommissioning is validated with concrete tests.
Why a thorough cleaning becomes essential (and not just “useful”)
A dirty wall-mounted heat pump can still blow air, but it often does so less efficiently and with greater effort :
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Reduced airflow : dust weighs down the turbine and clogs the passages.
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Odors : the mixture of humidity + dust + micro-deposits can generate a "musty" odor at startup.
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Unstable performance : the machine reaches the target temperature more slowly.
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Condensation/drainage : a partially clogged tray and drain increase the risk of dripping and runoff.
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Indoor air quality : the device circulates and redistributes what accumulates inside.
In a dense neighbourhood like Rosemont–La Petite-Patrie (close housing, traffic, urban dust, frequent pet hair), these phenomena can appear faster than one might think.
Our AirGreen approach: “clean”, controlled, and refurbished
1) Site preparation and surface protection
First and foremost, we secure the intervention:
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Power outage (dedicated circuit breaker / isolation).
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Protection of the floor, walls and furniture (tarpaulins, drip edge protection).
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A cleaning containment system has been put in place to prevent dirt from spreading throughout the room.
Even when the unit is already disassembled (as in the photo), we repeat the procedure properly: the objective is not only to remove the dirt, but to do so without contaminating the inside of the housing .
2) Controlled disassembly: hood, filters, grilles, flaps
We remove and inspect:
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Filters (often saturated with fine dust).
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Shutters and louvers (where deposits stick easily).
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Plastic panels and parts (which accumulate lint and cooking grease particles, very common in residential settings).
These elements are cleaned separately, using a method that respects the plastics (no aggressive products, no deformation, adequate drying).
3) Cleaning the coil (evaporator): delicate and efficient
The coil (the thin fins visible behind the facade) is a critical area:
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Dust removal and cleaning with products suitable for heat exchangers.
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Work in the direction of the fins to avoid bending them.
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Visual inspection: uniformity, absence of blockage, optimized airflow.
A clean coil = better heat exchange = better efficiency in both air conditioning and heating .
4) The heart of the problem: heavily clogged turbine/fan wheel
In your photo, the fouling is typical of a turbine that has accumulated deposits on the internal blades. This is often the main source of:
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decrease in airflow,
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noise,
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persistent odors.
Our cleaning service includes:
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Thorough cleaning of the turbine blades (controlled brushing + controlled rinsing according to configuration),
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Removal of stuck-on deposits,
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Checking the balance (a heavy and dirty turbine can vibrate).
This is the step that most transforms the final result: a machine can “come back to life” after a proper turbine cleaning.
5) Condensation tray and drain: preventing leaks and odors
We systematically address:
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Condensation tray : cleaning of residues and deposits.
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Drain : checking flow, cleaning if necessary, preventing blockages.
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Targeted disinfection if there are odors or biological deposits present.
A clean drain greatly reduces the risk of overflow and odors.
6) Reassembly, testing and return to service
We reassemble the unit with checks:
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Adjustment of parts, clips, flaps, alignment.
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Restart and tests: airflow, stability, noise, response to modes.
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Control of airflow quality and drainage behavior during operation.
Expected result after a complete cleaning (what is most often observed)
After this type of intervention, customers generally note:
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Lighter and more pleasant air ,
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Less odor at startup ,
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Stronger airflow at equivalent speed,
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Quieter operation
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More stable comfort, especially when the heat pump has to work for a long time (Quebec heat waves or cold).
How often should a Fujitsu wall-mounted heat pump be cleaned in Montreal?
Without dramatizing, let's remain pragmatic:
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Filters : regular maintenance (depending on use and presence of animals).
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Deep cleaning (coil + turbine + tank + drain): recommended periodically, especially if you observe:
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smells,
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reduced flow rate
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Visible dust upon exiting.
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unusual noise
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intensive use summer/winter.
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In Rosemont–La Petite-Patrie, where homes are often very occupied and dust circulates quickly, a thorough cleaning becomes an excellent investment to preserve performance, comfort and air quality.
Conclusion: an “internal” cleaning that protects your comfort and your device
At AirGreen , we treat Fujitsu wall-mounted heat pump cleaning as a performance and air quality intervention, not just a routine procedure. When the unit is as dirty as the one shown in the photo, a complete cleaning (turbine, coil, tray, drain, targeted disinfection) allows you to start fresh, improve airflow, and reduce odors, while protecting the system's lifespan.