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Réparation d’une thermopompe murale Hitachi à Rosemont–La Petite-Patrie
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Repair of a Hitachi wall-mounted heat pump in Rosemont–La Petite-Patrie

A call for service in a narrow, typically Montreal courtyard

At AirGreen , we work weekly in a variety of residential settings, from modern downtown condos to townhouses in Montreal's historic neighborhoods. On this day, our team went to Rosemont–La Petite-Patrie for a service call on a Hitachi wall-mounted heat pump , installed in a tight space between two buildings.

The client had been noticing a noticeable loss of air conditioning power and an unusual noise coming from the outdoor compressor for several days. The installation, elevated on a metal support, suggested a configuration suited to a tight urban environment—but also exposed to ventilation and maintenance challenges.

Diagnosis: Lack of maintenance and air circulation problem

During our initial inspection, we noted several clues:

  • The Hitachi unit had a buildup of dust and debris on the coils.

  • The surrounding space was very confined , which limited air circulation around the condenser.

  • The compressor vibrated abnormally at each start-up, a sign of excessive effort by the engine to compensate for the lack of heat exchange.

Our technicians immediately measured the refrigerant pressure and found an imbalance between the high and low pressure cycles. Such a symptom is typical of a dirty condenser , combined with insufficient ventilation .

Repair and Upgrade Steps

The intervention took place in several methodical stages:

  1. Complete cleaning of the Hitachi outdoor condenser using a biodegradable cleaner specially designed for aluminum coils.

  2. Suction of debris accumulated at the base of the support in order to clear air flows.

  3. Check the fan motor : re-align the blade and tighten the fasteners to eliminate vibrations.

  4. Refrigerant circuit check : measurement of pressures and temperatures to confirm that no leaks were present.

  5. Full performance test : After powering up, the unit was monitored for 30 minutes to ensure return to a blowing temperature that complies with Hitachi standards.

Results: a system that has become quiet and efficient again

The difference was noticeable by the end of the service. The noise level of the Hitachi heat pump had decreased significantly, and the customer quickly felt even cooling throughout his home.
We also checked the power consumption using a diagnostic ammeter: the compressor load had stabilized at normal values, proof that optimal energy efficiency had been restored.

AirGreen Tips for Tight Space Installations

Facilities like the one in Rosemont, located in narrow courtyards or side alleys , require some special precautions:

  • Maintain at least 30 to 40 cm of clearance around the outdoor unit to ensure good ventilation.

  • Clean the coils at least twice a year , especially after pollen season and before winter.

  • Install overhead protection (light canopy or deflector) to limit falling debris without blocking airflow.

  • Regularly check the stability of the metal support : a poorly aligned support can create vibrations and mechanical stress on the compressor.

These simple actions help extend the life of the compressor and maintain constant energy efficiency.

Why choose AirGreen for your HVAC repairs in Montreal

With years of experience in the residential and commercial HVAC industry , AirGreen stands out for its in-depth technical expertise and personalized approach .
Our teams operate throughout Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore , to diagnose and repair your heating and air conditioning systems quickly and sustainably.

Our commitment:

  • Fast and precise interventions on all major brands: Hitachi, Sharp, Gree, Midea, Fujitsu, Goodman, Lennox, Trane and many others.

  • Use of professional diagnostic tools to ensure compliance and performance of each device.

  • Transparent and guaranteed service , accompanied by recommendations adapted to each environment.

In summary

This Hitachi heat pump repair in Rosemont–La Petite-Patrie perfectly illustrates the challenges of compact urban installations. Thanks to an accurate diagnosis and comprehensive maintenance, AirGreen was able to restore the system's performance and quiet operation , while extending its lifespan.

AirGreen – Your HVAC reference in Montreal, Laval, Longueuil, North Shore and South Shore.
For any repair, installation or maintenance of Hitachi wall-mounted heat pumps , trust our local know-how and our commitment to quality.