In a condo in Ville-Marie , we performed a complete cleaning of a KoolKing wall-mounted unit (mini-split type). The photo clearly shows the indoor unit installed near the ceiling, with the air vent open and the illuminated display on the front (temperature set). This is a typical residential installation where the unit often runs for extended periods—and where dust accumulation eventually affects air quality , odor, and performance.
At AirGreen , we like to remind people of a simple fact: a wall-mounted heat pump is not “self-cleaning”. Even if it continues to blow cold or hot air, the interior can become filled with fine particles, humidity, and deposits that create a breeding ground for odors and contamination of the condensation tray.
Why cleaning is essential on a Kool King wall mural
A wall-mounted heat pump (or wall-mounted air conditioner) draws in ambient air, passes it through filters and a coil, and then redistributes it. In a downtown condo, you'll often find:
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fine particles (urban dust),
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variations in humidity (kitchen, bathroom, ventilation),
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frequent operation in heating mode in winter and air conditioning mode in summer.
When maintenance is not performed regularly, symptoms appear:
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decrease in airflow (the device “blows less”),
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persistent odor upon startup.
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The turbine/blower noise is more pronounced.
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efficiency decreases (the machine is working harder).
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condensation which manages water less well (drain to monitor).
Professional cleaning aims precisely to restore the unit to a clean, stable and efficient working condition, without damaging the components or internal finishes.
On-site visual diagnosis: what the image suggests
On this wall-mounted Kool King unit, the appliance is positioned high above sliding doors, with adequate clearance for operation. The cover is open, which usually allows for observation of:
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the presence of dust on the fins and outlet air areas,
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light deposits on the internal lamellae,
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a gradual fouling of the filters (even if you can't see it directly in the photo).
In this type of configuration (condo, closed spaces, low ceiling), a unit can get dirty faster than you think, especially if it is also used for heating in winter.
Our AirGreen method: complete and safe cleaning
We always proceed with a structured approach, to avoid water damage, protect the wall and ensure a lasting result.
1) Area protection and preparation
Before opening the unit, we protect:
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the wall beneath the device,
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the surrounding surfaces (doors, moldings, flooring),
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moisture-sensitive elements.
We then use a suitable wash bag (depending on the configuration) or a controlled cleaning method, in order to channel the water and residues.
2) Easy dismantling and access to critical areas
We open the cover of the wall-mounted unit to access the parts that get the most dirty:
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filters ,
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evaporator coil ,
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condensation tray ,
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drain ,
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turbine (blower wheel) and flaps.
This is where the difference lies between a "quick little clean" and a truly effective clean.
3) Cleaning the filters
The filters trap coarse dust. When they are saturated:
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the airflow decreases,
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The coil gets clogged more quickly.
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The device compensates by working harder.
We clean them carefully (rinsing + gentle brushing if required), then we let them dry properly before putting them back in place.
4) Cleaning the coil (evaporator)
The coil is the heart of the heat exchange. If it is clogged:
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Heat transfer is less efficient.
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Moisture sticks to the deposits.
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Odors may appear.
We clean the coil with products suitable for residential HVAC, respecting the materials (thin fins) and avoiding any bending or damage.
5) Condensation tray and drain: odor and overflow prevention
Condensation water should drain away without resistance. When the tray and drain become clogged:
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the water is stagnant,
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Bacteria and biofilms develop,
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"Damp" or "musty" odors may occur.
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and, in some cases, there is a risk of droplets or an overflow.
We clean the tank, then we check the drain (flow, blockage, slope, general condition). This step is essential, especially in a condo, where water damage can become a real problem.
6) Turbine / blower wheel: the often overlooked area
Even if the filters are cleaned, a clogged turbine can:
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propel particles,
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generate a blower noise,
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reduce the airflow,
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and retain odors.
We clean the turbine using a method that maintains its balance (important to avoid vibrations and noise). This step often most improves the feeling of "clean air" after the service.
7) Targeted disinfection and reassembly
When appropriate, we apply targeted disinfection to areas exposed to humidity (tray, internal areas), then we reassemble everything:
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hoods,
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filters,
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flaps and air direction vanes.
8) Functional tests
Once the cleaning is complete, we perform a full test:
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startup,
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blowing stability,
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checking for abnormal noises,
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output temperature control (differential),
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observation of condensation flow if the device is in air conditioning/dehumidification mode.
Concrete result: comfort, cleaner air, improved efficiency
After a complete cleaning, the most frequent gains on a KoolKing wall-mounted heat pump are:
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air perceived as “lighter” and less dusty,
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reduction (or disappearance) of odors at startup,
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improved airflow,
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quieter operation
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more stable performance in heating and air conditioning.
And most importantly: we reduce the likelihood of moisture-related problems (drain, tray, biofilm), which are very common on wall units in Greater Montreal.
How often should a wall unit be cleaned in Montreal?
To put it simply:
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Filters : ideally every 4 to 8 weeks during periods of intensive use.
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Complete professional cleaning : generally once a year , sometimes twice a year if:
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the unit works extremely well,
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There are animals,
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the air is dustier,
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or if the smells return.
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In Ville-Marie, condos often show consistent usage: air conditioning in the summer and supplemental heating in the winter. Regular maintenance then becomes a direct investment in comfort.
AirGreen in Ville-Marie: a clean, methodical, uncompromising intervention
Our goal is not just for the machine to "work," but for it to blow cleanly , remain reliable, and maintain good performance under real-world Montreal conditions. On this wall-mounted KoolKing , the approach was the same: complete cleaning of critical areas, verification of drainage, careful recommissioning, and testing.