A service call to restore the comfort of an apartment in Côte-des-Neiges
At AirGreen , we regularly work on PTAC (Packaged Terminal Air Conditioner) integrated air conditioning and heating systems—self-contained wall-mounted units often used in apartments, hotels, or commercial buildings. This time, our team visited a residential building in Montreal's Côte-des-Neiges neighborhood for a service call on an Applied Comfort unit .
Initial diagnosis: a noisy and inefficient device
The customer contacted us after noticing two major issues:
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a persistent mechanical noise when starting,
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and a notable drop in cooling performance .
Our certified technician quickly performed a complete inspection of the Applied Comfort PTAC system , a wall-mounted model installed at the bottom of the wall, typical of units passing through the exterior partition.
Inspection and technical findings
Our tests revealed:
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significant accumulation of dust on the evaporator and internal condenser, reducing airflow;
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an indoor fan motor with minor imbalance, causing vibration and noise;
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and a slightly low refrigerant level , affecting overall performance.
These three elements combined explained the observed loss of efficiency.
Steps of repair
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Deep cleaning of the evaporator coil and condenser, using professional products without corrosive residues.
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Rebalanced the fan and tightened the internal mounts to eliminate vibrations.
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Checked electrical connections and replaced a slightly swollen starting capacitor .
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Recharge the refrigeration circuit according to the factory specifications of the Applied Comfort model.
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Final performance test on both modes (cooling and heating).
After these interventions, the system regained an almost imperceptible noise level and optimal performance - the cold air was once again circulating evenly in the room.
Result: restored comfort and increased efficiency
In less than two hours, our technician managed to restore the PTAC to full performance , thus extending its useful life. The customer particularly appreciated our proactive approach: in addition to the repair, we carried out a preventive check of the drainage and air filter , often neglected in this type of system.
What you need to know about PTAC systems
PTAC units (like those from Applied Comfort ) are very common in medium-density housing in Montreal.
They combine heating and air conditioning in a single module , installed directly in the wall, and operate independently of a central network.
However, without regular annual maintenance , they are subject to:
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compressor failures due to fouling,
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excessive noise caused by dust or fan misalignment,
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and performance losses related to minor refrigerant leaks.
The importance of professional maintenance
At AirGreen , we recommend a complete maintenance before each summer , including:
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internal cleaning of the evaporator and condenser;
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checking the air flow and the ventilation motor;
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checking the refrigeration circuit and the condensate drain;
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calibration of the integrated thermostat.
These simple actions not only ensure better energy performance , but also prevent costly repairs .
AirGreen intervention in Côte-des-Neiges: a concrete example of HVAC know-how
This type of intervention illustrates our philosophy well: combining technical expertise, rigor and transparency .
Each repair is an opportunity to educate our customers on good maintenance practices and the lifespan of residential and commercial HVAC systems.
In the case of this PTAC Applied Comfort , the result was immediate:
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quiet operation ,
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stabilized energy consumption ,
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and restored interior comfort , even on the hottest days.
Conclusion
Thanks to the experience of our technicians and our in-depth knowledge of PTAC systems, AirGreen remains a trusted partner for any HVAC repair or maintenance in Montreal, Laval, Longueuil, on the North Shore and the South Shore .
Regardless of the make or model, we provide professional, fast and long-lasting service, always in compliance with safety and energy performance standards.