Technical intervention on a flat roof in downtown Montreal
During a service call in the Outremont neighborhood of Montreal , our AirGreen team was asked to repair two Panasonic Inverter wall-mounted heat pumps installed on the flat roof of a residential building. The client, the owner of a renovated duplex, had noticed a loss of air conditioning performance on the main unit as well as irregular noise coming from the compressor .
These compact units, typical of Panasonic wall-mounted mini-split systems, are ideal for apartment buildings, but their exposure on urban rooftops can accelerate component wear, especially during significant temperature variations between winter and summer.
Complete diagnosis: precision and method
Our technicians began with a systematic inspection of both condensers to compare performance and locate the source of the problem. After several measurements, the results revealed:
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Low R-410A refrigerant level on the first unit, resulting in insufficient heat exchange.
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Abnormal compressor noise caused by excessive vibration of the mount.
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Clogging of the outdoor coil , limiting heat dissipation and forcing the compressor to work harder.
Using our digital instrumentation, we were able to detect a micro-leak at a flare fitting —a common anomaly in installations exposed to sunlight and roof vibrations.
Panasonic System Repair and Refurbishment
Once the diagnosis was confirmed, we carried out the following interventions:
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Recovery of residual refrigerant using an approved recovery station.
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Repair of the flare fitting with replacement of the sealing ring and application of precise tightening torque.
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Nitrogen pressure tested at 350 psi for 30 minutes to ensure no leaks.
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Complete vacuum to remove any residual moisture.
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Recharge of the circuit with R-410A according to Panasonic specifications.
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Complete cleaning of the coil and checking the alignment of the anti-vibration support .
After restarting, pressures returned to normal and noise levels were significantly reduced. Both units were once again operating in perfect sync, ensuring even air distribution throughout the homes.
Results: efficiency and durability restored
Once the repair was completed, measurements showed an improvement of more than 25% in cooling capacity . The customer immediately noticed increased interior temperature stability and quieter operation.
We also carried out an energy performance assessment , confirming that Panasonic Inverter compressors were returning to their nominal efficiency, which will result in savings on electricity bills .
Maintenance tips for rooftop installations
Rooftop units, although efficient and discreet, require special attention:
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Cleaning the coils in spring and fall.
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Checking anti-vibration mounts to avoid mechanical noise.
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Refrigerant level inspection every two years.
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Protection against debris and urban dust , especially after roofing work.
These simple precautions significantly extend the life of Panasonic Inverter wall systems and ensure optimal performance all year round.
AirGreen: Trusted HVAC Expertise in Montreal and Beyond
At AirGreen , every intervention is carried out with rigor and transparency. Whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore , we provide repair, maintenance and installation of all brands of HVAC systems.
Our technicians are certified to work on Panasonic, Fujitsu, Gree, Midea, Sharp, Lennox and Bosch systems, whether residential or commercial. We believe that quality service is based on three pillars: accurate diagnosis, genuine parts and sustainable intervention .
Thanks to our expertise, even installations located in complex urban environments like Outremont quickly regain their performance and reliability.