In an apartment in Ville-Marie , in the heart of Montreal, we were called in for a complete cleaning of a Fujitsu wall-mounted heat pump (mini-split indoor unit). The photo shows a classic wall-mounted unit installed high up, typical of condos and apartments where efficient heating/cooling is desired without ductwork.
Even when a machine is "running," the inside can accumulate dust, biofilm, and moisture. The result: odors , reduced airflow , noise , higher energy consumption , and sometimes the feeling that the air conditioning or heating is working unnecessarily. Our goal: to restore this Fujitsu to a clean, stable, and efficient condition, with a meticulous approach tailored to Montreal residential settings.
The existing system: Fujitsu wall-mounted heat pump (recent model)
It is difficult to identify an exact model number from a single photo of the indoor unit. However, the shape and dimensions correspond very well to a recent generation Fujitsu wall-mounted heat pump , comparable to the Altair series (e.g., Altair 300 / Altair 500 ), frequently installed in Quebec for their efficiency and comfort.
What this implies in terms of cleaning:
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The indoor unit contains filters , evaporator coil , turbine (blower wheel) , condensation tray and drain .
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Efficiency depends heavily on the cleanliness of these components, especially in an urban environment (fine dust, cooking, variable air circulation, etc.).
Why a cleanup is essential in Ville-Marie
In Ville-Marie, we often see realities that accelerate the accumulation of dirt and grime:
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Windows often open in mid-season (outdoor dust, particles).
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Open-plan kitchen : fine grease that settles on the heat exchangers.
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Variable indoor humidity (showers, drying clothes, ventilation sometimes limited).
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Intensive use: air conditioning in summer + supplementary heating in autumn/spring .
Even a slight buildup on the turbine or coil can:
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reduce heat exchange,
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create abnormal condensation
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to generate a "musty" smell upon startup,
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increase the sound level,
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reduce comfort (less air projected, less uniform rooms).
Our AirGreen method: clean, protected, efficient residential cleaning
1) Surface preparation and protection
First and foremost, we work cleanly:
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protection of the wall, floor and nearby furniture,
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installation of a cleaning cover (wash bag type) under the unit,
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Securing the area to prevent any splashing or runoff.
This step is essential in a condo/apartment: we aim for an impeccable result, without damage and without traces.
2) Cleaning the filters: the basics, but not enough
Filters are the first line of defense. Us:
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Let's remove them.
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Let's dust them off and wash them thoroughly,
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Let's check their condition (deformation, greasy soiling, fragility),
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We return them after drying and inspection.
A clean filter immediately improves:
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the airflow ,
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air quality ,
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internal static pressure (therefore less effort from the fan).
3) Cleaning the coil (evaporator): where the air is conditioned
The coil is the critical area: it's what cools (or heats) the air. When it's clogged:
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The exchange is less favorable.
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The machine can condense more than necessary.
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Performance drops.
We proceed to:
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a controlled cleaning of the fins,
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the use of suitable products (residential, without unnecessary aggressiveness),
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special care must be taken to avoid damaging the thin fins.
Expected result: better heat transfer , more stable cycles, more consistent comfort.
4) Cleaning the turbine (blower wheel): the real source of the odors
In most cases of odors, the culprit isn't the filter: it's the turbine . With humidity, dust sticks and forms a film that:
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retains the particles,
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may promote odors at startup,
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unbalances the rotation (noise, vibration).
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reduces the volume of air projected.
We carry out a thorough cleaning of the turbine, with an approach that respects the mechanics and avoids “pushing” the dirt further into the unit.
5) Condensation tray and drain: prevent leaks and backflow
A wall-mounted heat pump naturally produces water when cooling (and sometimes when dehumidifying). If the tray or drain is partially blocked:
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Water can stagnate,
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Odors appear,
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There may be drips, backflow, or abnormal humidity.
We :
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Let's clean the bin.
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Let's check the flow,
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Let's check the condition of the drain (debris, deposits, slope, signs of obstruction),
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Let's put everything back in a safe condition.
6) Recommissioning and operational checks
After cleaning:
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testing of air conditioning and heating modes (depending on the season),
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Airflow and flap control,
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checking for the absence of water leaks,
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validation of overall operation (noise, response, stability).
The goal is not just for it to "blow air", but for it to blow air well , cleanly , and with consistent performance.
What the customer notices (often within the first few minutes)
After a thorough cleaning of a Fujitsu wall-mounted unit like this one, the benefits are usually very tangible:
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Fresher, more neutral air (fewer odors at startup)
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Increased airflow (you can feel the projection better)
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Less noise (cleaner turbine and more stable rotation)
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Better air conditioning in hot weather
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More efficient heating in the shoulder seasons, and more stable performance when it's cold outside
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Reduced risk of internal mold growth due to stagnant moisture
Cleaning vs. “simple maintenance”: the nuance that changes everything
Many people quickly clean the filters, then are surprised when the smell returns or the machine remains noisy. The reality:
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Filters require minimal maintenance.
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Air performance and quality depend mainly on the coil , turbine , and drain .
At AirGreen, our approach aims for deep cleaning, while remaining perfectly suited to residential use (clean, controlled, without excess).
How often should a wall-mounted heat pump be cleaned in Montreal?
In practice, for an environment like Ville-Marie :
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Filters : ideally every 3 to 6 weeks during periods of intensive use (summer/winter).
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Complete cleaning (coil + turbine + tank + drain): once a year is an excellent standard.
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If there are odors, allergies, animals, or frequent cooking: sometimes twice a year (spring + late summer).
Regular cleaning prolongs service life and reduces the risk of breakdowns due to dirt and moisture.
Why entrust your cleaning to AirGreen?
In a Ville-Marie condo, the margin for error is small: you want a clean , precise job, without any damage . We emphasize:
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surface protection,
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a structured method,
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clear checks after intervention,
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a recommissioning which confirms that the machine is stable and safe.
Our goal: to make your Fujitsu wall-mounted heat pump a discreet, efficient, and pleasant appliance for everyday use.