In a residential building in Rosemont–La Petite-Patrie , our AirGreen team performed a complete cleaning of a Gree wall-mounted heat pump . This type of unit (mini-split) is very common in Montreal because it offers good comfort year-round… provided it remains clean inside. Neglected maintenance often leads to reduced airflow, odors, poorly managed humidity, and less stable performance during colder periods.
The photo clearly shows the open indoor unit, with its internal components exposed and a protective covering on the floor. This is exactly the right approach: thorough cleaning requires protective coverings , appropriate products, and a method that prevents spreading dirt throughout the room.
Context of the intervention in Rosemont
The customer contacted us regarding a decrease in comfort and a feeling of less effective ventilation. Without going into lengthy speculation, this scenario is common: over time, a wall unit accumulates fine dust, textile particles, and sometimes the beginnings of biofilm in the condensation zone, and this is enough to reduce air quality and efficiency.
Here, the objective was clear: to restore the Gree wall-mounted heat pump to a clean, stable and hygienic operating state by performing a complete cleaning of critical areas.
Machine type and model
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Machine type: Wall-mounted heat pump (mini-split / wall unit)
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Brand: Gree
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Model: not legible in the photo; therefore, we are sticking with a realistic and consistent designation: Gree wall-mounted heat pump (recent residential range)
In practice, the cleaning method remains the same on the majority of Gree wall units: filter, evaporator (coil), turbine, condensation tray, drain, and recommissioning.
What the visuals reveal (and why it matters)
In the image, the unit is open and we can see:
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The coil (evaporator) with its fins (blue/green tint), an area that captures fine dust and humidity.
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The flap and the blowing area, where dirt can migrate towards the turbine (wheel) .
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A protective cover installed under the unit (plastic/tarpaulin) is essential to control drips and prevent soiling the floor and walls.
These signs indicate a thorough cleaning, not just a quick wipe of the facade.
Our AirGreen protocol for complete cleaning (Gree wall-mounted heat pump)
1) Securing and preparing the site
Before any cleaning, we apply simple but essential steps:
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Shutdown and securing of the unit according to best practices
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Installation of protective measures (floor, nearby furniture, wall if necessary)
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Preparation of a water/runoff recovery system to prevent any infiltration
This preparation is particularly important in residential spaces like those often found in Rosemont , where every detail counts (floors, freshly painted walls, furniture placed close together).
2) Cleaning the filters (and checking their condition)
Filters are the first line of defense. When they are saturated:
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the airflow drops,
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unity is stronger,
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The dust eventually settles further along the circuit.
We proceed to:
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Filter removal
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Proper cleaning (without deforming them)
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Check: if a filter is too damaged, it is recommended to replace it
Expected result: better flow rate , more regular ventilation, fewer circulating particles.
3) Thorough cleaning of the coil (evaporator)
The coil is the heart of the heat exchange. Even a thin layer of dirt affects:
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heating/cooling capacity,
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energy efficiency,
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temperature stability.
We use a fin-friendly approach:
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Targeted dust removal
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Application of a suitable cleaning product to the heat exchangers
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Controlled rinsing (with collection of runoff)
Objective: to restore efficient heat exchange and limit odors related to humidity and deposits.
4) Cleaning of the turbine (fan wheel) and the blowing area
This is an area often overlooked during "quick" cleanings. Yet, a clogged turbine causes:
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a higher noise level
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an irregular flow rate,
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persistent odors,
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a projection of fine dust into the room.
We proceed with a methodical cleaning of the accessible parts, avoiding any projection on the wall, then we check the rotation and balance of the wheel.
5) Condensation tray, drainage and odor prevention
In a wall-mounted unit, moisture condenses and drains away. If the drip tray and drain line become clogged:
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Water can accumulate,
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Odors may appear,
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The risk of overflow increases.
Our intervention includes:
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Cleaning the condensation tray
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Inspection and cleaning of the drainage line
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Flow control (functional, without backflow)
This is a key step to avoid dripping and odor problems in the following weeks.
6) Targeted disinfection (if relevant) and hygiene upgrade
When the unit has accumulated moisture and deposits, targeted disinfection helps to:
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reduce odors,
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to limit microbial proliferation,
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improve the feeling of cleaner air.
We always remain within a residential framework: suitable products, controlled application, respect for surfaces and the living environment.
7) Reassembly, testing and performance validation
Once the cleaning is complete:
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Complete reassembly and panel adjustment
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Functional tests (ventilation, modes, response)
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Airflow and noise check
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Final visual inspection: no drips, no marks, site left clean
The goal is simple: a Gree wall-mounted heat pump that works better, more quietly, and with significantly more pleasant air.
Typical results after a thorough cleaning
After this type of intervention, customers generally observe:
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Improved airflow
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More stable temperature (heating and air conditioning)
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Odor reduction
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Quieter operation
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Less dust put back into circulation
And, in the long term, better consistency of performance during demanding periods of the Quebec climate.
Recommended frequency in Montreal (realistic practice)
In residential settings, the following are often recommended:
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Filter cleaning: every 4–6 weeks during periods of heavy use
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Complete cleaning (professional): approximately once a year , or more often if:
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presence of animals,
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renovation work,
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dustier air,
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intensive use (heating + air conditioning).
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Conclusion: A clean Gree wall-mounted heat pump means reliable comfort
This intervention in Rosemont–La Petite-Patrie clearly illustrates the difference between superficial maintenance and a complete cleaning . A Gree wall-mounted heat pump can offer excellent comfort, but it requires serious maintenance to maintain its efficiency, protect air quality, and prevent problems related to humidity.
At AirGreen, we rely on a clean, structured method that respects your interior, with on-site verification of the recommissioning process.