Essential maintenance on an urban roof
On the rooftops of Plateau-Mont-Royal , outdoor heat pump units are exposed to the harshest conditions: summer heat, urban pollution, and dust accumulation. During this AirGreen service call , our team came to inspect and maintain several Fujitsu wall-mounted heat pumps installed on the roof of a residential building. A typically Montreal intervention, combining technical expertise and respect for a dense urban environment.
Context of the intervention
The client, a condominium association, noticed that some outdoor units were generating unusual noise and that air conditioning performance seemed to be diminished in several apartments. These signs could indicate a refrigerant pressure problem, an unbalanced fan, or generalized coil fouling.
Our technicians quickly organized an on-site visit to carry out a complete inspection of the equipment fleet.
Accurate diagnosis and safety on the roof
Working on a flat roof requires special vigilance. First and foremost, our team secured the work area and checked the condition of the roof covering to avoid any damage when moving tools and equipment.
Each Fujitsu outdoor unit has been individually tested :
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Refrigerant pressure measured using our digital pressure gauges.
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Visual inspection of refrigeration lines to detect possible micro-leaks.
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Checking electrical connections and terminal blocks, sometimes weakened by thermal cycles.
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Thorough cleaning of the coils with warm water under moderate pressure, to remove accumulated urban debris.
Result: two of the five units had a slight R410A refrigerant charge imbalance , resulting in reduced efficiency of approximately 15%.
Refrigerant repair and recharge
Once the cause was identified, our technicians proceeded to:
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Recovery of existing refrigerant , in accordance with environmental standards.
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Leak detection using an electronic detector – no active leak detected.
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R410A calibrated refill , adjusted according to the Fujitsu nameplate.
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Post-intervention performance test , confirming optimal evaporation pressure and temperature.
Each unit was then restarted, allowing immediate restoration of interior comfort for the condo occupants.
AirGreen Expertise: Preventive maintenance in urban environments
At AirGreen , we emphasize the importance of annual HVAC system maintenance , especially on Montreal rooftops. These environments promote the accumulation of dust, pollen, and fine particles, which can quickly reduce energy efficiency and cause noise or vibrations.
Our recommendations for co-ownerships:
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Schedule an annual cleaning of outdoor units before the warm season.
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Ensure that the roof supports are stable and insulated from the covering .
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Regularly check condensate drains to avoid overflows on the facade.
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Maintain a collective maintenance register , useful for the sustainability of the equipment fleet.
Final result
At the end of our intervention, all Fujitsu units were back to their original performance. The union praised our rigorous and transparent approach: accurate diagnosis, clear explanations, and rapid return to service without disturbing the occupants.
Once again, AirGreen demonstrates its ability to combine technical expertise and attention to detail, even in demanding contexts such as the flat roofs of downtown Montreal.
Why choose AirGreen for your heat pump maintenance?
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Certified and trained technicians on major brands (Fujitsu, Midea, Gree, Lennox, etc.).
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Complete and safe maintenance on all types of flat or sloping roofs.
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Rapid interventions in Montreal, Laval, Longueuil, North Shore and South Shore.
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Precise diagnosis thanks to the latest generation of electronic measuring instruments.
Your comfort deserves the expertise of a specialized team.
AirGreen , your trusted HVAC partner in Montreal.