Fast and effective intervention on the South Shore despite winter conditions
At AirGreen, we are often called upon to intervene in tough conditions, especially during Québec’s harsh winters. Recently, we received a service call in Delson, on the South Shore of Montréal, for a PerfectAir wall-mounted heat pump that had stopped working properly in cold weather. The customer, concerned about the loss of heating in a main living area, contacted us for an urgent repair. Thanks to our quick response and expertise, we were able to solve the problem efficiently, while ensuring optimal performance of the unit despite the snow and freezing temperatures.
Problem detected: outdoor unit covered in ice and sensor errors
Upon arrival, the outdoor unit of the PerfectAir wall-mounted heat pump was partially covered in snow and ice. The unit was installed on a back balcony against a brick wall, fully exposed to the elements, with no elevation or protective shelter. Several signs pointed to a problem related to ice buildup around the compressor, but also potentially to a faulty outdoor temperature sensor, as the system remained idle despite heating demand. The client informed us that the heat pump had stopped producing warm air the day before and that manual restarts had no effect.
Full diagnostic and technical checks
Our certified technicians carried out a complete HVAC diagnostic, including the following steps:
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Checked the electrical supply (no issues found)
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Inspected sensor wiring and connectors
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Analyzed the defrost logic of the PerfectAir system (12,000 BTU wall-mounted model)
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Observed the automatic defrost cycle: not functioning upon arrival, despite visible ice buildup
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Retrieved error codes from the indoor unit’s control panel
After thorough analysis, we identified two main causes for the malfunction:
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Excessive ice buildup around the fan and coil of the outdoor unit
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Partial failure of the outdoor temperature sensor, causing the control module to misread data
On-site repair and maintenance: defrosting, sensor replacement, and preventive advice
Our experts performed a manual defrost of the unit using professional tools, carefully avoiding damage to any components, followed by a complete cleaning of the outdoor coil. We then replaced the outdoor temperature sensor, using a compatible part for the installed PerfectAir model. After the repair, we restarted the system and confirmed proper heating cycles and functional automatic defrost mode.
Additionally, we carried out preventive cleaning of electrical connections, which are often subject to oxidation during winter months.
Results: comfort restored and energy efficiency ensured
Thanks to this fast and targeted intervention, the PerfectAir heat pump was able to resume its efficient heating function in winter, much to the customer’s relief. They immediately noticed a rise in temperature in the affected room. We also provided recommendations for winter maintenance, including:
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Regularly clearing snow around the outdoor unit
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Never using hot water or corrosive defrosting products
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Installing a raised support or protective shelter if possible, to limit accumulation
Customer testimonial: satisfaction and renewed trust
The client expressed complete satisfaction with the speed of our response, the quality of the work performed, and the clarity of our technical explanations. They appreciated our availability during the winter season and our informative approach. This type of intervention clearly showcases our ability to work in demanding conditions, while ensuring top-tier HVAC service in Delson and throughout the South Shore.
AirGreen Expertise: proven know-how for your HVAC repairs
At AirGreen, we have the experience, technical skills, and necessary parts to repair all types of wall-mounted heat pumps, regardless of the brand, whether it's PerfectAir, Fujitsu, Gree, LG, or others. We respond quickly throughout the Greater Montréal area, Laval, Longueuil, the North Shore, and the South Shore, providing long-lasting, optimal, and guaranteed repairs.
Why choose AirGreen for your wall-mounted heat pump repairs?
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Fast service, even in the middle of winter
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Certified and experienced technicians
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Large inventory of parts for most brands
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Accurate diagnostics and clear explanations
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Maintenance and tailored recommendations
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Courteous, professional, and efficient service
In case of breakdown, contact us right away
A wall-mounted heat pump that no longer heats or stays frozen can cause not only discomfort but also unnecessary energy consumption. Our teams are ready to respond quickly to diagnose, repair, and optimize your HVAC systems, whether you're in Delson, Saint-Hubert, Brossard, or anywhere else on the South Shore.
AirGreen, your trusted local partner for PerfectAir wall-mounted heat pump repairs in Delson and across the entire metropolitan region.
