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Réparation d’une thermopompe murale Haxxair à Rosemont–La Petite-Patrie (Montréal)
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Repair of a Haxxair wall-mounted heat pump in Rosemont–La Petite-Patrie (Montreal)

In an apartment in Rosemont–La Petite-Patrie, our AirGreen team intervened to repair a Haxxair wall-mounted heat pump (mini-split) , installed high up in a corner of the room, near the ceiling. This type of installation is very common in Montreal: excellent air distribution, but also more susceptible to two factors often seen in the field — soiling (dust, microparticles) and condensate drainage .

Here, the customer contacted us for two typical symptoms: a noticeable drop in performance and the appearance of moisture/droplets around the indoor unit.

Context of the visit: a Haxxair wall unit in a residential environment

The unit in question is a recent generation Haxxair wall-mounted heat pump ( inverter type, residential size). Since the exact model is not visible in the photo, we are deliberately being consistent and realistic: it is a Haxxair wall-mounted inverter (9,000 to 18,000 BTU category, typical for this type of room and configuration).

Observable (and important) installation details

  • Indoor unit installed very close to the ceiling , in a high position, in a corner: good for air reach, but requires impeccable drainage.

  • Front air outlet with directional flaps: diffusion must remain free (without obstruction) to avoid recirculation and false diagnoses.

  • Connections probably pass laterally (left side) towards the outside: a frequent detail that influences the slope of the drain and the risk of mini “counter-slope” if it has moved over time.

The problem: reduced performance + traces of moisture

In this case, the client's complaint could be summarized as follows:

  • "It's not cooling as well as before, and it seems to be working harder."

  • "We noticed humidity and dripping at certain times."

This pair of symptoms can have several causes. The key is not to jump directly to the conclusion of "lack of gas" (a very common mistake). On a wall-mounted unit, the problem often originates with the airflow or the drain .

Our AirGreen diagnostic (methodical, step-by-step)

1) Checking the airflow and internal condition

We always start with what is most likely:

  • filters,

  • turbine (blower wheel)

  • heat exchanger (coil),

  • condition of the condensate tray.

Result: accumulation of fine dust and the beginning of internal clogging, enough to reduce airflow . When the airflow drops, the machine can:

  • cooling less efficiently

  • create areas of abnormal condensation,

  • encourage water to "overflow" if the drain is partially slowed down.

2) Condensate drainage control (drain)

Next, we validate the critical point:

  • pipe slope

  • presence of a partial blockage (biofilm, dust, deposit),

  • Actual flow rate in air conditioning mode.

Result: partially blocked drainage (common in urban areas, especially when maintenance has been infrequent). Water accumulates in the tray, then eventually seeps out as droplets or moisture around the unit.

3) Refrigeration validation (without “inventing” a lack of charge)

Once the airflow/drain issues are addressed, we ensure that the system does not have a deeper problem:

  • visual inspection,

  • control of operating parameters,

  • consistency of temperatures and inverter behavior.

Result: overall consistent operation — the core of the problem was indeed internal maintenance + the drain , not a major breakdown.

The repairs carried out (concrete and clean)

To restore this Haxxair to its normal level, we proceeded as follows:

  1. Complete cleaning of the filters and immediate restoration of airflow.

  2. Thorough cleaning of the heat exchanger (coil) to restore heat exchange (and prevent the machine from "straining" unnecessarily).

  3. Condensate tray cleaning : removal of deposits that promote overflow and odors.

  4. Unblocking the condensate drain (purge + cleaning) in order to restore a clear, continuous, unimpeded flow.

  5. Testing under real-world conditions (air conditioning mode, flow observation, air diffusion stability, behavior control).

Result: restored comfort, more stable machine, reassured customer

After the procedure:

  • colder and more constant air

  • significantly improved airflow

  • No moisture or drips were observed during testing.

  • quieter machine (often, a clogged turbine makes noise and vibrates slightly),

  • The client was reassured: we eliminated the cause, not just the symptom.

What we recommend to avoid a recurrence of the problem (Montreal specific)

In Rosemont and elsewhere on the island, urban dust combined with daily life (cooking, textiles, air circulation) quickly clogs a mural. For a Haxxair like this one:

  • Filters: check / light cleaning every 4–6 weeks during periods of heavy use.

  • Complete maintenance: ideally once a year (or every 2 years if light use), especially to protect the drain and the heat exchanger.

  • Warning signs: reduced flow, musty smell, water stains, different noise = we intervene early, before it becomes damage.

At AirGreen, our approach is simple: accurate diagnosis, durable repair , and clear explanation to the customer — because a wall-mounted heat pump is a very reliable system… when the air and water circulate as they should.