In a dense urban context like the Plateau-Mont-Royal , every HVAC installation must contend with very real constraints: limited space, wooden decks, party walls, and restricted access for maintenance. It was precisely in this type of environment that we recently intervened to repair a Fujitsu wall-mounted heat pump , installed on a typical rear rooftop terrace of Montreal plexes.
System type and observed configuration
The existing system is a Fujitsu wall-mounted heat pump (mini-split) , with a compact outdoor unit mounted on treated wooden blocks to isolate it from decking vibrations. The refrigerant lines are protected by black insulating sheathing, clearly visible in the photo, and run discreetly along the exterior wall to the indoor unit.
Given the condenser format and residential use in cold climates, the system is consistent with a Fujitsu Orion XLTH (R-32) wall-mounted heat pump , known for its heating performance even during Montreal's harsh winters.
Problem reported by the client
The occupants observed:
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a loss of heating efficiency during colder periods;
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irregular operating cycles ;
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an unusual noise coming from the outdoor unit during startup.
In an area like the Plateau, these symptoms are often exacerbated by exposure to wind, the accumulation of debris on terraces, and rapid temperature variations.
Diagnosis carried out by AirGreen
Our AirGreen team carried out a complete inspection:
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checking the pressure of the refrigeration circuit ;
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checking the condition of the insulation on the pipes (partially degraded by exposure);
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inspection of the outdoor unit support , which showed a slight sagging affecting the alignment;
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reading the operating codes of the Fujitsu system.
The diagnosis revealed a slight loss of performance linked to deficient insulation of the connections combined with imperfect mechanical stability of the outdoor unit.
Repair work carried out
We carried out the following interventions:
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complete upgrading and stabilization of the outdoor unit support ;
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replacement and improvement of the insulation of the refrigeration pipes , adapted to the winter conditions of the Plateau;
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preventive cleaning of the condenser to ensure optimal air circulation ;
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recalibrating the system to restore the performance parameters recommended by Fujitsu .
Each step was carried out taking into account the limited space and the acoustic requirements specific to terraced houses.
Results and benefits for the client
After the repair, the Fujitsu wall-mounted heat pump was restored to:
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a stable and efficient heating capacity , even in cold weather;
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quieter operation;
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improved long-term reliability thanks to a solidly corrected outdoor installation.
Occupants now benefit from constant thermal comfort , while having the assurance that their system complies with best practices for a Montreal urban environment.
AirGreen's expertise at the service of Greater Montreal
At AirGreen , we service Fujitsu wall-mounted heat pumps daily in neighborhoods like Plateau-Mont-Royal, Rosemont, and the Southwest. Our approach is based on rigorous on-site analysis , durable repairs, and a thorough understanding of the specific constraints of residential buildings in Greater Montreal.