In this area of Rosemont–La Petite-Patrie, work is very common on typical Montreal brick buildings, where outdoor units are mounted on wall brackets to free up floor space and prevent snow accumulation in winter. The photo clearly shows a Gree outdoor unit attached to the wall above a window, with a nearby electrical disconnect box and refrigerant lines exiting from the side.
The goal of the appointment: a complete cleaning (interior + exterior) to restore stable airflow, limit odors, reduce consumption and extend the life of the heat pump.
The system: Gree wall-mounted heat pump (mini-split)
This is a wall-mounted heat pump (mini-split type) with a compact outdoor unit. The exact model isn't visible in the image; therefore, it's a new-generation Gree wall-mounted heat pump (standard residential size), perfectly suited to Montreal homes.
Why cleaning is essential (especially in Montreal)
Even when a heat pump is “still” working, fouling eventually becomes noticeable:
-
Dust-clogged filters and internal heat exchangers → reduced airflow, uneven comfort
-
Clogged turbine (impeller) and condensation tray → odors, humidity, risk of mold
-
Outdoor coil (urban dust, pollen, deposits) → reduced efficiency, longer cycles
-
In winter: a dirty system defrosts more often and can lose performance during Quebec's cold weather.
Proper preventative cleaning usually helps to recover some of the yield and avoid costly service calls.
What we did: a complete cleaning, step by step
1) Site preparation and protection
Since the outdoor unit is installed above a window and on a brick facade, we have:
-
protected surfaces (edges, masonry, area under the unit)
-
checked clearances and safe access to the facility
-
carried out a visual inspection of the cables and the disconnect box
2) Cleaning the Gree outdoor unit
On an outdoor wall unit like this one, dirt buildup mainly occurs in:
-
the rear/lateral coil
-
the fan area and the grille
-
the nooks and crannies of the chassis and the base
Our intervention included:
-
Gently brush the fins (without crushing them)
-
application of a suitable heat exchanger cleaner, then controlled rinsing (safe pressure)
-
cleaning the grille and ventilation area
-
inspection of the base and drainage points
3) Checking the supports and visible elements (salient details)
The image shows metal wall brackets and a clean installation. We checked anyway:
-
the rigidity of the supports and the presence of silent blocks/anti-vibration mounts
-
general condition (oxidation, bolts, fluid level)
-
the passage of refrigerant lines and the exposed insulation
-
the proximity of the electrical disconnect switch and the condition of the visible wiring
These points matter a lot in Montreal: vibrations, defrost cycles, freeze/thaw and humidity accelerate wear if a fastener loosens.
4) Cleaning the indoor unit (the most “costly” part)
Even though the photo shows the exterior, the heart of the cleaning often happens inside:
-
filter removal and washing
-
cleaning of the internal heat exchanger
-
cleaning/degreasing the condensation tray
-
targeted disinfection (as needed) to reduce odors and biofilm
-
Checking and clearing the drain (flow rate, slope, absence of obstructions)
When the turbine (wheel) is under load, increased noise and a "sluggish" airflow are observed. Thorough cleaning often corrects this situation.
5) Recommissioning and checks
Once the cleaning is complete:
-
restarting and testing the modes (heating/air conditioning depending on the season)
-
checking airflow, operational stability and fan behavior
-
Final inspection to ensure there are no water leaks at the drain and that the outdoor unit is properly ventilated
Expected results after a good cleaning
Without promising “miracles”, we very often see:
-
improved airflow and a faster feeling of comfort
-
Fewer odors (especially when restarting)
-
smoother operation (less noise, more stable cycles)
-
A heat pump that works less hard → better efficiency and increased lifespan
Maintenance tips (simple, effective)
For a Gree wall-mounted heat pump in Montreal:
-
Rinse/vacuum the filters every 4–6 weeks during periods of heavy use.
-
Keep the outdoor unit clear (of leaves, dust, snow)
-
plan a complete periodic cleaning (often annually, sometimes more frequently depending on usage/dust/pets)
Why entrust this to AirGreen?
Cleaning isn't just about "watering" a unit. We work with a comprehensive HVAC approach:
-
safe products and methods for coils and fins
-
surface protection (brick, windows, immediate environment)
-
Checking critical components: drain, condensate, supports, visible connections
-
recommissioning and concrete functional tests
Conclusion
This intervention in Rosemont–La Petite-Patrie illustrates exactly the type of cleaning that makes a real difference on a Gree wall-mounted heat pump : restoring the exchangers and key components to a clean state, limiting residual moisture, securing the installation on wall brackets, and then validating the operation under real-world conditions.