In a Rosemont–La Petite-Patrie apartment, we performed a complete cleaning of a Gree wall-mounted heat pump installed high above a large interior opening (such as a passageway between two rooms). This is a very common configuration in Montreal: practical for air distribution, but demanding during maintenance because the surfaces below must be protected and the work must be carried out cleanly, without splashes or fine dust.
The photo clearly shows a Gree wall-mounted unit (mini-split) in operation, with the setpoint displayed (16). Even when the unit appears to be functioning normally, the gradual clogging of the filters, fan, and coil eventually reduces airflow, increases noise, promotes odors, and decreases efficiency. Our goal: to restore the unit to impeccable sanitary and mechanical condition without damaging the room or disturbing the occupants.
System type: Gree wall-mounted heat pump (mini-split)
This is a wall-mounted heat pump : a compact indoor unit, mounted high on the wall, with diffusers and filters accessible behind the front panel. This type of unit is very common in Montreal condos and multi-unit buildings because it offers:
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an efficient supplementary (or primary) heating system for the mid-seasons,
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comfortable air conditioning in the summer,
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precise regulation thanks to inverter technology (depending on the range).
The exact model is not visible in the image. Therefore, we will use a realistic and consistent designation: Gree wall-mounted heat pump (residential series, new generation) .
Why a “deep” cleaning is crucial, even if the unit appears clean
To the naked eye, a wall-mounted unit may look fine… while the fouling is hidden in key areas:
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Filters : they capture dust, hair, textile fibers. Once saturated, the flow rate drops.
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Coil (evaporator) : dust sticks to the moisture, creating an insulating film.
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Turbine / tangent wheel : this is often the main source of odors, noise and loss of performance.
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Condensation tray + drain : possible biological accumulation (biofilm), risk of runoff and odors.
In a neighborhood like Rosemont, where apartments often have variable air circulation, nearby kitchens and urban dust, regular cleaning directly improves air quality , comfort and system reliability .
Our AirGreen approach: structured, clean and safe cleaning
1) Preparation and protection of the premises (an essential step here)
As the unit is installed above a passageway between rooms, we paid particular attention to protection:
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tarpaulins and protective coverings on surfaces under the device (floor, furniture, passageway),
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Installation of a cleaning cover adapted to the wall units to channel water and residue,
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Securing the area to prevent any flow into the opening and to limit projections.
This step makes all the difference between a "quick little clean" and a professional cleaning that truly respects the house.
2) Opening of the unit and visual inspection
We open the front panel and perform a quick inspection:
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filter status
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presence of dust on the coil
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traces of abnormal humidity,
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condition of the flaps and fins,
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turbine fouling index.
This allows us to adapt the method (pressure, products, rinsing, contact time) without damaging the components.
3) Cleaning the filters: the basics… but not the end
The filters were removed and thoroughly cleaned:
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dusting,
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washing (if the filter type allows it),
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Controlled drying before reinstallation.
A clean filter immediately improves airflow . But on its own, it won't solve odor or performance problems if the rest of the system is clogged.
4) Cleaning the coil (evaporator) and fins
We clean the coil using a method that respects the equipment:
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application of an appropriate cleaner (depending on the condition and level of dirt),
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Gentle brushing as needed (without deforming the fins),
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controlled rinsing via the cleaning cover.
Result: better heat exchange capacity, therefore better heating in winter and better air conditioning in summer, with less effort for the machine.
5) Condensation tray treatment and drain check
The condensation tray and the drain are sensitive areas:
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cleaning the tray
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control of water flow,
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Checking the drainage system to prevent backflow and leaks,
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reduction of the risk of biofilm and odors.
In many residences, the "musty" smells come precisely from this area, especially when the unit has been heavily air-conditioned in the summer.
6) Turbine cleaning: the step that changes everything
The turbine (tangent wheel) is often the most heavily soiled part, and it's the one that propels air into the room. When it's loaded with greasy dust, it can:
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to significantly reduce the flow rate
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to create a lasting scent
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to generate noise or vibration,
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cause black deposits in the airflow.
We clean it carefully, avoiding any misalignment, then we make sure that the rotation is smooth.
7) Targeted disinfection and finishing
Depending on the context and observed condition, we carry out targeted disinfection of the relevant areas (without unnecessarily over-treating). The objective is clear: to limit microbial proliferation and improve the feeling of "clean" air, while respecting the materials.
Finally, we clean:
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the hood,
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the shutters,
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the air outlet grilles,
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the contact areas and visible dust.
Recommissioning and testing: we do not leave until validation
After reassembly:
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functional test,
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airflow check,
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flap stability control,
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confirmation that there is no abnormal flow,
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confirmation of quiet and regular operation.
The setpoint display visible on the unit (16) highlights an important point: a wall-mounted heat pump can operate for extended periods at different setpoints, but if it is dirty, it will consume more energy and produce less heat. A thorough cleaning helps restore more stable operation and consistent comfort.
The tangible benefits for the client (Rosemont–La Petite-Patrie)
After a complete AirGreen cleaning on a Gree wall-mounted heat pump , the expected results are very tangible:
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Cleaner air (less dust recirculated),
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Odor reduction ,
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Improved airflow ,
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Improved energy efficiency ,
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Less noise ,
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Less risk of leaks or blocked drains,
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Extended device lifespan.
How often should a Gree wall-mounted heat pump be cleaned in Montreal?
In a Montreal residential context, a realistic basis:
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Filters : regular check, periodic cleaning (depending on use, pets, dust).
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Complete cleaning (coil + turbine + tank + drain): recommended regularly, especially if the unit is used a lot for air conditioning in the summer and for heating in the mid-season.
Consistent maintenance avoids surprises at the worst time (heatwave, extreme cold, periods of humidity).
Conclusion
This service call in Rosemont–La Petite-Patrie perfectly illustrates what we do at AirGreen: professional, methodical, and thorough cleaning , tailored to the specific layout of the home. A well-maintained Gree wall-mounted heat pump provides greater comfort, improved air quality, and more consistent performance, season after season, in the demanding climate of Greater Montreal.