In a condo in Ville-Marie , we performed a complete cleaning of a KoolKing wall-mounted heat pump (mini-split). This type of unit is often installed high up, in high-traffic living spaces, which makes maintenance even more important: dust accumulates quickly on the filters and, with humidity, can lead to odors , reduced performance , and degraded air quality .
The photo clearly shows a KoolKing wall-mounted head unit installed above an opening (door/sliding panel style) in a modern residential setting. Dirt is also visible on the side air intake (grille), along with typical signs of a unit that needs thorough cleaning.
Why cleaning is crucial on a KoolKing wall-mounted heat pump
A wall-mounted heat pump does more than just heat or cool: it continuously circulates and filters the room's air. Over time, dust, fine particles, and humidity accumulate on:
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the filters
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the coil (evaporator)
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the turbine/tangent wheel
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the condensation tray
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the drain (water drainage)
When these components become clogged, we often observe:
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a decrease in airflow
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A device that is under strain, therefore consumes more
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a less stable feeling of comfort (uneven temperature)
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odors upon ignition (often related to humidity and dust)
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an increased risk of mold in the bin or near the drain
Initial findings on site (visible evidence and verifications)
In this condo in Ville-Marie, our approach was simple: confirm the actual condition of the unit and identify the areas to be treated as a priority.
Visible clues
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Dirt buildup on the side grille (air intake), with vertical dust marks.
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Equipment at height: requires rigorous protection of walls, floor and nearby surfaces.
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Visible air flaps: we ensure that the mechanism is clean and that nothing obstructs diffusion.
AirGreen Systematic Checks
Before cleaning, we always do the following:
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test of modes (heating/cooling/ventilation)
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airflow control
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inspection of the filters and the coil
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Drain check (free flow, no backflow)
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Listening for noises: whistling, turbine friction, vibrations
Our AirGreen protocol: deep, clean and controlled cleaning
The goal is not to “make it look pretty”: it is to restore the unit to a healthy working condition , with normal airflow, reliable water drainage and efficient heat exchange.
1) Protection of the area (essential in condo)
Since the unit is installed in a finished living space (light paint, clean surfaces, recessed lighting), we are installing:
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tarpaulins and ground protection
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wall protection around the unit
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washing cover (for collecting water and residue)
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Securing the area under the device to prevent any splashing
This step changes everything: a thorough cleaning must be controlled , especially indoors.
2) Filter cleaning (first barrier)
We remove the filters, then:
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initial dusting
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appropriate washing (without damaging the filter media)
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rinse thoroughly
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drying and repositioning at the right time (never “soaked” in the unit)
Clean filters = better airflow, less strain on the machine, more pleasant air.
3) Treatment of the coil (evaporator)
The coil is the heart of the heat exchange. If it is clogged, the unit loses efficiency.
We proceed to:
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fin inspection
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application of a suitable cleaning product (non-corrosive, suitable for residential use)
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Controlled rinsing in the wash bag
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checking the general condition and flow
Expected result: a cleaner exchange surface, therefore better performance in heating in winter and in cooling in summer .
4) Cleaning the turbine (tangent wheel) and the diffuser
This is often where the odors appear. The turbine can accumulate a film of dust and moisture which:
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reduces the flow rate
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unbalances the rotation
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promotes odors at startup
We clean thoroughly:
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turbine/wheel
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broadcasting component
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directional fins
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accessible crankcase
This step is crucial to restoring a more consistent and cleaner airflow.
5) Condensation tray + drain: prevent leaks and odors
In cooling mode (and sometimes in heating mode depending on conditions), the unit generates condensation. If the tray or drain is partially blocked:
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risk of drips or wall runoff
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stagnant odors
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microbial development
We do:
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cleaning the tray
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targeted disinfection if necessary
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slope and flow check
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drainage test (to verify that the water drains correctly)
6) Reassembly, commissioning and final testing
Once the unit is clean:
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reinstallation of components
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Test in ventilation mode then in demand mode (heating/cooling depending on the season)
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airflow control
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noise check (often quieter after cleaning)
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confirmation of drain flow
What the customer usually notices after a thorough cleaning
Without promising the impossible (every home and use is different), a thorough cleaning very often brings:
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a more neutral atmosphere (fewer odors)
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a stronger and more consistent airflow
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a more stable temperature in the room
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a device that "forces" less, therefore better efficiency
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less dust put back into circulation
In an area like Ville-Marie , where many residences are well-insulated condos occupied year-round, regular maintenance becomes a simple way to maintain reliable comfort without overconsumption.
Recommended frequency (simple and realistic)
For a KoolKing wall-mounted heat pump for residential use:
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Filters: light cleaning every 4 to 6 weeks (more often if pets, construction work, dust)
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Complete cleaning: usually once a year
(or twice a year if intensive use of heating + air conditioning, or if allergies/pets)
Why entrust your cleaning to AirGreen?
A mini-split system is difficult to clean "only halfway". Here's what makes the difference:
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Water and residue control (washing cover, complete protection)
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access to critical areas (turbine, tank, drain, coil)
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clean reassembly, without forcing the clips, without damaging the fins
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Final check: flow rate, noise, drainage
Our approach is designed for Montreal residential properties: condos, finished walls, limited spaces, and the need for a clean, neat, damage-free result.
Conclusion
This service call in Ville-Marie on a KoolKing wall-mounted heat pump perfectly illustrates what proper maintenance should accomplish: restoring the unit to a healthy state, improving heat exchange, ensuring safe condensation drainage, and providing more comfortable air every day. A thorough cleaning is also a concrete way to protect your investment and avoid unpleasant surprises during peak season.