In an interior staircase, air tends to circulate from one floor to another. This is often an excellent location for installing a wall-mounted heat pump : it can moderate the temperature on the ground floor while helping the upper floor remain comfortable. However, it's also an environment where dust, humidity fluctuations, and drafts can accelerate soiling and lead to performance variations.
At AirGreen , we recently performed a complete service on a Gree wall unit installed high on a clear wall above a residential stairwell in Rosemont–La Petite-Patrie . The placement is clean and aesthetically pleasing, but it imposes specific requirements: safe access, careful verification of drainage, and adjustments to the airflow direction to avoid cold (or excessively hot) areas in the stairwell and adjacent rooms.
System type: Gree wall-mounted heat pump (mini-split)
The visible format corresponds to a typical wall-mounted mini-split unit : white front panel, lower air outlet, high wall installation. In this type of configuration, the indoor unit relies heavily on three elements to maintain stable performance:
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Clean heat exchange (unobstructed coil/evaporator)
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Constant airflow (clean filters and turbine)
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Proper condensate management (unrestricted drainage)
Model (consistent with the brand)
Since the exact model isn't visible in the photo, we're describing the service as having been performed on a new-generation Gree wall-mounted heat pump , model Livo+ (a common and consistent product line for residential use). From a service perspective, the most important thing is less the exact model name than the maintenance process: these units offer excellent comfort when properly maintained and adjusted .
What we systematically check during an AirGreen service
A "quick" service (a simple vacuuming of the filters) is not enough if the goal is to prevent breakdowns, odors, and loss of efficiency. Our approach aims to confirm that the unit is heating/cooling as it should , without unnecessarily straining its system.
1) Functional diagnosis and symptom reading
Before any intervention, we observe:
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the behavior of the blowing (regularity, noise, vibration)
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the response to instructions (requested temperature vs. actual perceived temperature)
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the cycles (too frequent starts/stops, defrost mode in winter)
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signs of fouling (odor, reduced flow rate, abnormal condensation)
In a stairwell, an improperly adjusted damper or overly horizontal airflow can create an uncomfortable "air corridor." We take into account the architecture, the volumes, and the natural air circulation between floors.
2) Cleaning of filters and exchange surfaces
On wall-mounted heat pumps, the filters are the first line of defense. When they become saturated:
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the airflow decreases,
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Heat exchange becomes less efficient.
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the unit works longer,
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Consumption may increase.
We carry out the cleaning (or repair if necessary) and we check the condition of the coil : a thin film of dust can reduce efficiency and promote odors, especially in humid conditions.
3) Turbine and air diffusion check
An often overlooked point: the turbine (fan wheel) can accumulate deposits that are invisible at first glance. The result: noise, vibrations, irregular flow, and sometimes odors.
In this case, the unit is installed at a height: we paid particular attention to stability and alignment, to avoid the micro-vibration which becomes very noticeable in a resonant space such as a staircase.
4) Condensate drainage: preventing damage and bad odors
In cooling mode (and sometimes dehumidifying mode), the unit produces condensation. A partially blocked drain can cause:
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water flow,
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persistent odors,
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Excessive humidity,
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Risk of damage to walls/baseboards.
We check the slope , the condition of the drain pipe , and the drainage system's behavior. In a stairwell, this is a critical point: the slightest leak can be noticed late, especially if it's leaking behind a molding or in a hidden corner.
5) Electrical and safety controls
A reputable service includes simple but essential checks:
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status of accessible connections
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how the controls work
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reaction to changes in fashion,
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general stability (fixing, clip, vibration).
We also confirm that the usual settings (modes, speeds, swing, programming) are consistent with the actual use of the building.
6) Stairwell-specific comfort adjustments
In Rosemont–La Petite-Patrie, duplexes/triples and houses with significant vertical circulation are common. For this type of location, we generally recommend:
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a blowing action slightly directed downwards to break up the stratification.
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an appropriate fan speed (neither too high nor too low),
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a stable setpoint rather than extreme variations
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In winter, a strategy that limits "heat waves" on the ground floor and cold on the upper floor.
These adjustments often provide an immediate increase in comfort, without changing the machine.
Why maintaining a Gree wall-mounted heat pump is particularly cost-effective in Quebec
A wall-mounted heat pump works hard: air conditioning in the summer, heating in the fall, sometimes even into the cold periods of the Quebec winter, with defrost cycles and load variations.
A well-conducted maintenance session generally allows you to:
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to maintain good performance and a constant airflow,
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reduce the risk of odors and discomfort,
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limit premature wear,
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detect anomalies early (noise, drainage, performance),
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to extend the system's lifespan.
And most importantly: we prevent the unit from compensating for simple fouling by "forcing" itself, which ultimately costs energy and reliability.
The result: stable performance, cleaner air, and better distributed comfort
At the end of our intervention in Rosemont–La Petite-Patrie, the objective was clear: to put the Gree unit back in a state where it blows properly, manages humidity well, and distributes temperature more evenly between levels.
If you have a wall-mounted heat pump installed in a stairwell, hallway, or open area, periodic servicing is often the best way to maintain comfort… and avoid surprises when you need it most.