In a residential unit in Rosemont–La Petite-Patrie , we performed a complete cleaning of a Gree wall-mounted heat pump (indoor wall unit). As seen in the photo, the front panel was open and the evaporator coil (the bluish fins) was fully accessible, allowing us to do a precise, clean, and safe job—exactly what's needed to maintain performance, reduce odors, and improve air quality.
At AirGreen , we emphasize one point: a wall-mounted heat pump can continue to "operate" even when it's dirty… but it works harder, heats/cools less efficiently, and often ends up creating musty odors or drainage problems . Thorough cleaning, done at the right time, prevents these issues and extends the equipment's lifespan.
Appliance type: wall-mounted heat pump (indoor wall unit)
This is clearly a wall-mounted unit (mini-split). The visible access to the coil confirms that we are on the indoor unit: this is what manages the heat exchange with the ambient air, and it is also where dust, micro-particles and humidity tend to accumulate.
Brand (supplied manually): Gree
Model: not visually identifiable → we deliberately maintain a consistent designation: Gree residential wall-mounted heat pump .
What the photo tells us (useful clues for a thorough cleaning)
The image shows:
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The coil (evaporator) is exposed, with more pronounced areas where dust has started to settle in the fins.
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The need for delicate cleaning: the fins are thin, and overly aggressive cleaning can bend them and impair airflow.
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A clean and bright residential context: typically, cleaning should be done while carefully protecting surfaces (walls, floor, furniture), even if the device is "only" slightly soiled.
Why wall unit cleaning is essential in Montreal
In Greater Montreal, a wall-mounted heat pump often operates year-round :
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Air conditioning in summer (humidity + dust + pollen)
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Heating in autumn/winter (drier air, fine particles, prolonged operation)
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Transition periods (frequent on/off cycles, conducive to condensation)
As a result, the indoor unit becomes a point of capture for particles and, if drainage is imperfect, an environment conducive to odors and biological fouling (without dramatizing: this is common and avoidable with proper maintenance).
Our AirGreen approach: structured cleaning, without "close enough"
Proper cleaning isn't just a quick rinse and you're good to go. We follow a thorough method, tailored to wall units like this Gree .
1) Protection of the premises and securing
Before touching the coil:
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Power outage/safe shutdown of the device
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Surface protection (tarpaulins, floor coverings, cleared work area)
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Setting up a clean environment to prevent any splashing
This is particularly important in a condo or house with freshly painted walls: a well-done cleaning should be invisible to the client, except by the result.
2) Filter cleaning (first barrier)
The filters capture large particles. 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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Comfort decreases (air is less well distributed).
We proceed to:
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Controlled dust removal
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Washing (if applicable) and proper drying
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Checking the general condition (deformation, breakage, abnormal saturation)
3) Cleaning the coil (evaporator): the most important part
The coil visible in the photo is central to the heat pump's efficiency. We clean it using a method that respects the fins:
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Gentle brushing / appropriate dusting
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Apply a suitable cleaning product (not aggressive to the components)
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Controlled rinsing (without flooding the unit or forcing water onto the wrong area)
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Visual inspection: fins clear, surface uniform, improved heat exchanger ventilation
When the coil is clean, the device returns to:
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Improved airflow
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Improved heating/cooling capacity
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A reduction in the risk of odors associated with damp deposits
4) Condensation tray and drain: preventing leaks and odors
A large proportion of service calls originate from a partially blocked drain:
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Water accumulating
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Damp smells
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Sometimes leaks or drips
We do:
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Cleaning the condensation tray
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Drain and flow control
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Checking the slope/path (when accessible)
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Functional restoration for stable drainage
5) Turbine (blower wheel): performance and air quality
Even if it is not clearly visible in the photo, the turbine is often the element that:
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It traps a film of greasy dust.
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Causes odors on startup
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Reduces blowing power
Depending on the condition observed, we carry out an appropriate cleaning (controlled method, without damaging the balance), because a mistreated turbine can vibrate and become noisy.
6) Targeted disinfection (when relevant)
We favour a reasoned approach:
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Targeted disinfection of damp or smelly areas
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Products compatible with internal components
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Objective: to neutralize odors and sanitize, without unnecessarily over-treatment.
7) Reassembly, complete testing and validation
After cleaning:
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Careful reassembly of the panel and filters
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Test in ventilation/air conditioning/heating mode (depending on the season)
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Checking noise, airflow, and drain flow
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Final check: device clean, stable operation, no marks on surfaces
Expected results after a thorough cleaning
On a Gree wall-mounted heat pump like this one, a good cleaning generally involves:
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Fresher, healthier air (less dust circulating)
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Odor reduction at startup
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Improved comfort (more consistent airflow, better diffusion)
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Improved efficiency : the device works less hard to achieve the same temperature
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Reduced risk of water leaks due to a clogged drain
How often should a wall-mounted heat pump be cleaned in Montreal?
Without resorting to a rigid rule, here is a realistic approach:
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Filters : check them regularly (especially during periods of intensive use)
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Thorough cleaning : generally recommended periodically, especially if:
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presence of animals
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dusty environment (construction work, busy street)
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use 12 months/year
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appearance of odors, decreased flow rate, discomfort
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A service done at the right time costs much less than an emergency service, and avoids "small problems" that become bigger.
Conclusion: A cleaning that protects your Gree investment
This service call in Rosemont–La Petite-Patrie perfectly illustrates what AirGreen strives for: a methodical cleaning, focused on key components (coil, filters, tray, drain, turbine), with an impeccable finish. A well-maintained Gree wall-mounted heat pump remains quiet, efficient, and reliable—summer and winter, under the very real conditions of Quebec.