Home » Some of Our Service Calls in Greater Montreal » Haxxair wall-mounted heat pump repair in Ville-Marie (Montreal): cold air return, drainage corrected, and performance restored.
Réparation d’une thermopompe murale Haxxair à Ville-Marie (Montréal) : retour d’air froid, drainage corrigé et performance retrouvée
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Haxxair wall-mounted heat pump repair in Ville-Marie (Montreal): cold air return, drainage corrected, and performance restored.

In a condo in Ville-Marie , a client contacted us because their Haxxair wall-mounted heat pump was only partially functioning: the unit would start, the display would stay on (clearly showing a setpoint), but the comfort level was compromised. The air was lukewarm, the performance was inconsistent, and there was a feeling of dampness near the wall… the kind of situation that often ends with blocked drainage or reduced heat exchange .

In the photo, we can see an indoor unit installed very high on the wall, near the ceiling — a typical configuration for condos to optimize air diffusion — and protective tape (like painter's tape) on the right side, a sign that care was taken to protect the surfaces during the intervention.

The type of system and what it entails

This is a Haxxair wall-mounted heat pump (mini-split) . This type of equipment is excellent for urban dwellings: it heats, cools, dehumidifies, and responds quickly… but it remains sensitive to three things:

  • Fouling (filters, turbine, evaporator)

  • Condensate drain (slope, blockage, improvised siphon, imperfect connection)

  • Refrigerant charging and circulation (micro-leaks, connections, suboptimal pressure)

When just one of these elements malfunctions, the device can "run" without delivering the expected performance.

Reported symptoms (and what we suspected)

In this case in Ville-Marie, the clues pointed to a duo that is very common in residential settings:

  1. Reduced airflow (filters and/or turbine clogged with fine dust — very common in condos)

  2. Inefficient water drainage (start of backflow or partially blocked drain)

The result: the heat exchanger cools poorly, dehumidification becomes unstable, and water can accumulate where it should never be.

Our AirGreen diagnostic: field method, zero improvisation

On site, we proceeded as we always do: a complete diagnosis, not just “a quick clean-up”.

1) Immediate checks

  • Inspection of the facade, shutters, and airflow

  • Filter and fouling level check

  • Visual inspection of the condensate tray and drain point

  • Validation of modes (heating/cooling/drying), settings and fan behavior

2) Drainage control (often the real culprit)

  • Flow test: we check if the water drains quickly and without backflow

  • Pipe inspection: pinching, insufficient slope, deposits, partial blockage

  • Checking for a possible “low point” that is retaining water (common when a pipe has been moved or has slightly sagged)

3) Performance monitoring

  • Blowing temperature and stability after a few minutes of operation

  • General condition of the heat exchanger (evaporator): fine dust and oily film = reduced efficiency

  • Checking connections and overall operation (without making unnecessary assumptions)

The repairs carried out on the Haxxair wall-mounted heat pump

Once the cause was confirmed, we carried out a clean, thorough and lasting intervention.

Targeted cleaning (to restore performance)

  • Filter cleaning

  • Controlled internal cleaning of the exchange area (where dirt "breaks" efficiency)

  • Checking the movement of the flaps and the fan to ensure uniform diffusion

Drainage correction (to eliminate moisture and the risk of leaks)

  • Condensate drain clearing/cleaning

  • Restoring the drainage system (slope and passage) so that the water drains away immediately

  • Final drainage test: condensate production is simulated, and a smooth and constant drainage is confirmed.

The protective tape visible in the photo makes perfect sense here: in a condo, walls, moldings and frames are protected — because an HVAC repair should leave zero trace , apart from the restored comfort.

Result: stable comfort, cleaner air, reassured customer

After being put back into service:

  • Airflow has returned to a steady and consistent level.

  • Immediate perceived comfort (more stable temperature, less humidity)

  • End of signs of water accumulation and reduced risk of wall damage

  • A quieter and more consistent Haxxair unit (often a direct result of a clean heat exchanger and healthy drainage)

What we recommend to prevent it from happening again

In urban areas like Ville-Marie (fine dust, air circulation, frequent construction in buildings), a wall-mounted heat pump deserves a simple routine:

  • Clean the filters regularly

  • Regular preventative maintenance (especially before severe cold weather and before summer)

  • Watch for subtle signs: decreased flow rate, musty smell, unusual change in comfort

At AirGreen, our goal is always the same: to repair correctly , explain clearly , and restore the system to a level of performance that inspires confidence — not just “get it running again”.