In a bright apartment in Ville-Marie , our AirGreen technicians were called out for a seemingly simple problem: a wall unit that was "working," but no longer providing the expected comfort. The photo on site clearly illustrates this: a wall unit installed high up, above a clear wall, typical of a residential space where quiet, a stable temperature, and discreet airflow are desired. This is exactly the kind of situation where a well-executed HVAC service makes all the difference.
In this article, we present a complete intervention on a Haxxair wall-mounted heat pump (model not legible in the photo — so we remain with a consistent designation such as Haxxair new generation wall-mounted series ), with a field approach: diagnosis, maintenance, technical checks and concrete advice to prevent the problem from recurring.
A Haxxair wall unit: when "it blows air" doesn't mean "it performs well"
A wall-mounted heat pump can continue to blow air… while heating or cooling less. In a densely populated area like Ville-Marie , where temperature fluctuations, dry winter air, and urban dust accumulate quickly, the most common symptoms look like this:
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ambient temperature that is slow to stabilize
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longer (or more frequent) cycles than before
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a feeling of warm air in heating mode, or of less cool air in air conditioning mode
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increased ventilation noise
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slight odors at startup (often related to humidity + dust in the unit)
And very often, the cause is not "a major breakdown", but a combination of factors: clogged filters, a loaded internal exchanger, drainage to monitor, or settings and measurements that have deviated from optimal.
What we observed on site in Ville-Marie
Visually, the installation is clean: a white wall unit, properly positioned at a certain height, adequate clearance around it, and no obvious defects on the cover. This is typical of a heat pump that has been installed correctly… but simply needs professional maintenance and a complete validation of its parameters.
In this type of configuration, our priority is to check:
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the quality of heat exchange (actual heating/cooling capacity)
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airflow and internal cleanliness (fan, heat exchanger, filters)
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drainage (drain, condensate pipe, slope)
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electrical and electronic stability (controls, probes, communication)
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temperature variations and consistency of modes (heating/cooling/drying/auto)
Our AirGreen service: step-by-step guide to a Haxxair wall-mounted heat pump
1) Performance diagnosis (before cleaning)
Before cleaning anything, we measure. That's the basis of a serious service.
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reading of return and supply air temperatures
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Fan behavior control (speeds, ramp-up, stability)
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inspection of filters and heat exchanger (charge level)
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Settings validation (mode, setpoint, swing, speed, programming)
The objective: to distinguish a simple lack of maintenance from an issue of control, sensor, drainage, or power supply.
2) Targeted internal cleaning (without compromising on surfaces)
Effective cleaning of a Haxxair wall-mounted heat pump goes beyond just the filters. We also perform the following:
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Filter cleaning (dust removal + washing if applicable)
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cleaning the internal heat exchanger (fins) to restore heat transfer
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checking and cleaning the condensate tray
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Drainage pipe inspection (risk of slowdown, deposit, backflow)
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wiping of sensitive areas and aesthetic restoration
Expected result: better airflow, reduced odors, better temperature stability and less strain on the machine.
3) Functional checks and adjustments
After cleaning, we revalidate the same points as at the start:
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temperature difference (before/after)
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behavior of the flaps and the swing
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stability of cycles
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listening for noises (vibration, rubbing, abnormal hissing)
If necessary, we adjust the basic parameters (according to the desired comfort) to avoid common condo/apartment errors: overly aggressive instructions, unstable Auto mode, too low a speed which "suffocates" the exchanger, etc.
Why maintenance is particularly important in urban areas like Ville-Marie
In Montreal, and even more so in a central area like Ville-Marie , wall units are often in demand:
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supplementary heating in winter (when the main heating system is less flexible)
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Continuous air conditioning is maintained in summer, especially in sunny units.
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Frequent cycles due to heat gains (windows, cooking, occupancy)
Without maintenance, even a good machine will eventually lose efficiency. And this loss translates directly into:
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more consumption
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more wear and tear
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no more comfort complaints
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and sometimes… avoidable service calls
Signs that a Haxxair wall-mounted heat pump needs service
Here are the signs that should trigger an interview (or a diagnosis):
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Less warm air in heating mode despite a high temperature setting
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Less cool air in air conditioning or persistent humidity
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increasing blower noise
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odor at startup
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dripping water or traces of moisture around the unit
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The remote control "responds", but the output is weak in the room.
At AirGreen, we prefer to intervene before a problem becomes a breakdown. It's simpler, more economical, and it protects the system's lifespan.
Best practices between visits (simple, effective tips)
While not a replacement for a professional service, here's what really helps:
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Clean/vacuum the filters gently on a regular basis (as needed).
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Avoid blocking air circulation with tall furniture
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maintain a stable heating setting (avoid extreme variations)
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monitor for signs of moisture (drainage)
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Schedule maintenance before the peak season (winter/summer)
AirGreen in Ville-Marie: HVAC service adapted to residential needs
Our approach is measured, transparent, and results-oriented service : we observe, we measure, we clean properly, we adjust, and then we validate the performance. For a Haxxair wall-mounted heat pump , this is the method that allows you to quickly restore normal comfort—without replacing parts unnecessarily.
Whether it's for preventative maintenance, poor performance, or a check-up after an intense season, we operate throughout Montreal , including Ville-Marie , with procedures adapted to wall units and the residential context.