In many condos and apartments in Southwest Montreal, compact and discreet wall-mounted heat pumps are installed high on the wall to efficiently cool the space in summer and contribute to comfort in winter. The photo clearly shows a Tosot wall-mounted indoor unit , set to 26°C , with the louver open: a typical situation where a thorough cleaning makes a real difference, both in terms of performance and air quality.
At AirGreen , we carry out this type of intervention methodically, cleanly and safely, with one priority: to degrease, disinfect and put the device back into service without damaging surfaces (walls, floors, furniture), while ensuring that the drainage and ventilation of the unit are impeccable.
The system: Tosot wall-mounted heat pump (mini-split) – compatible Lomo model (or equivalent range)
The unit pictured is a classic wall-mounted heat pump (mini-split/wall unit) : white indoor unit, LED display, motorized louver, and horizontal air distribution. This type of unit is very common in homes in southwestern France because it offers:
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rapid air conditioning in summer, even during episodes of humid heat in Montreal;
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simple management (remote control, automatic modes, programming);
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an integrated basic filtration system, which nevertheless requires regular maintenance.
Even though the exact model label isn't visible in the photo, the configuration is consistent with a Tosot Lomo series (or a comparable residential series). In any case, the cleaning and inspection points remain the same.
Why professional cleaning is essential (even if “it still works”)
A wall-mounted heat pump can continue to blow air… even when it's clogged with dirt . The problem is that the dirt builds up where you can't see it:
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on the filters (fine dust, hair, particles);
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on the evaporator coil (greasy film + dust);
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on the turbine / ventilation wheel (sticky black deposits, source of odours);
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in the condensation tray and drain (biofilm, mold, partial obstruction).
The result: reduced efficiency, more humid air, odors, noise, and sometimes even water leaks. In a condo, this can quickly become a nuisance… or a risk to surfaces and neighbors.
Our AirGreen method: a “clean” and complete cleaning, step by step
1) Site protection and initial inspection
Before touching the device, we carefully protect the area under the unit (wall, floor, furniture). Then, we perform a quick inspection:
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filter and flap condition;
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presence of odors at startup;
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condensation runoff (signs of a slow drain);
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visible dust level in the fins and air outlet.
This step allows the intervention to be adapted: some accommodations (open-plan kitchen, pets, recent renovations) require more intensive cleaning.
2) Easy dismantling and access to critical areas
For truly effective cleaning, simply "rinsing the filters" is not enough. We open the unit and access the components that accumulate the most deposits:
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filters ;
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serpentine (fins);
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turbine (often the main source of odors);
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condensation tray .
We always work with methods adapted to residential use: no water damage, no splashes, no aggressive products that could attack plastic or aluminum.
3) Filter cleaning: removal of particles and controlled rinsing
The filters trap much more than just dust: pollen, textile fibers, hair, and fine particles. We clean them thoroughly, then allow them to dry completely before reassembling to prevent residual moisture (a common cause of odors).
4) Cleaning the coil: restoring heat exchange
The coil is the internal “radiator”: if it is coated with a film, the unit has to work harder to produce the same level of comfort. We apply a suitable cleaning method (controlled degreasing, targeted rinsing), taking care to protect the integrity of the fins.
Direct benefit: better efficiency , more stable cycles, and a faster feeling of comfort.
5) Turbine/ventilation: the step that changes everything for odors
In many cleanings, the turbine is the most surprising part: it may appear visually "clean" on the outside, but have a heavy load on the blades. We treat it with care because:
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It is she who puts the particles back into circulation;
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This is often the cause of "musty" or "moldy" smells;
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A clogged turbine can create an irregular and noisier airflow.
6) Condensation tray and drain: leak prevention
A wall-mounted unit produces condensation when air conditioning (and sometimes when dehumidifying). If the tray and drain are clogged, water can accumulate, overflow, or drain poorly.
We clean and check:
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the baccalaureate;
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the drain outlet;
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the actual flow (not just “in theory”).
In a condo in the Southwest, this step is crucial: you want to avoid any surprises, especially when the unit is working intensively during a heat wave.
7) Reassembly, restarting and testing
Once everything is clean and dry, we carefully reassemble and test it:
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stability of operation;
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quality of the blowing;
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response of the unit to the setpoint (e.g. 26 °C);
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no odor upon restart;
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drainage behavior.
This is also the time when we give you simple tips, adapted to your pace of use.
Typical results after cleaning (what customers actually notice)
After a complete intervention, the effects are often immediate:
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lighter air, less loaded;
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reduction of odors at startup;
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better comfort with the same storage conditions;
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quieter device;
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more regular cycles (less effort to maintain temperature).
And most importantly: we greatly limit the risks of internal mold and problematic drainage , two frequent causes of service calls in the middle of summer.
Maintenance tips for a Tosot wall-mounted heat pump in Montreal
To prolong the cleaning effect:
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Filters : regular checking (higher frequency if pets, open kitchen, renovation).
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Fan mode : useful at times to help dry the interior after a long period of air conditioning.
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Stable temperature : avoid repeated extreme variations, especially during major heat waves.
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Periodic professional cleaning : recommended for treating the turbine, drain and hidden areas.
Simple maintenance, combined with thorough cleaning at the right time, protects your investment and improves everyday comfort.
Why entrust your cleaning to AirGreen in the Southwest?
In the Southwest, housing options are varied: modern condos, duplexes, and older buildings. We adapt our approach to each context:
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Rigorous surface protection and clean intervention;
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effective methods on “hidden” areas (turbine, tank, drain);
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return to service with real checks, not just “a glance”;
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Clear and practical advice, without being overwhelming.
Our goal is simple: to ensure your Tosot wall-mounted heat pump blows healthier air and regains stable performance over the long term.