Summer breakdown detected in the heart of a green garden
At AirGreen , we regularly receive service calls for KoolKing wall-mounted heat pumps , a popular brand in North Shore residences. Recently, our team responded to a customer in Boisbriand , where a customer reported a lack of cooling from their system, which was in good visual condition. The outdoor unit, discreetly installed near a wall surrounded by ferns, appeared clean—but was hiding a much more subtle problem.
Initial inspection: when nature invites itself into the system
At first glance, the outdoor condenser appeared intact. However, a closer examination revealed:
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An accumulation of plant debris at the base of the coil;
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Wet leaves partially blocking air circulation;
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An abnormally low sound level from the compressor.
These signs suggested compressor overheating caused by insufficient cooling . In this type of configuration, especially when the unit is surrounded by dense vegetation, the fan airflow can be obstructed, reducing heat transfer efficiency.
Step 1: In-depth diagnosis
Our technicians carried out a complete analysis of the refrigerant circuit :
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Suction and discharge pressure measurements : slightly higher than normal;
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Superheat and subcooling test : inconsistent values, sign of disturbed circulation;
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Electrical inspection of compressor and fan;
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Visual inspection of copper pipe connections and insulation.
The diagnosis confirmed intermittent compressor overheating , caused by air obstruction combined with condenser fouling . No leakage issues were detected—good news for the customer.
Step 2: Deep Cleaning and Reconditioning
We carried out a complete maintenance of the wall-mounted heat pump:
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High pressure cleaning of the condenser coil using a biodegradable product;
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Suction of debris accumulated at the base of the crankcase;
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Clearing vegetation around the unit to restore a free space of at least 60 cm on all sides;
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Checking the wiring and tightening the terminals;
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Application of a protective treatment against corrosion.
Once these steps were completed, we re-ran the system to measure actual performance.
Step 3: Test results and calibrations
After intervention, the KoolKing heat pump displayed perfect performance:
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Outlet temperature: 10°C ;
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Balanced pressures;
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Standardized sound level;
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No thermal break.
We also checked the heating mode to ensure the reversible valve was working properly—an essential test, even in summer. The system responded instantly, confirming a smooth and stable cycle reversal.
AirGreen Expertise: Between Technical Precision and Sustainability
This case perfectly illustrates the importance of regular preventative maintenance for systems installed in green environments. At AirGreen, we emphasize three principles:
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Airflow monitoring : Plants and debris can reduce yield by 30%;
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Biannual cleaning : before the warm season and after autumn;
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Compressor calibration and refrigerant check : two often neglected points that guarantee the longevity of the machine.
Our technicians, trained on the KoolKing, Gree, Fujitsu, Midea and Zephyr brands, adapt each diagnosis to the configuration of the home to optimize energy efficiency while respecting the environment.
AirGreen Tips for KoolKing Heat Pump Owners
To maximize the performance of your unit:
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Always keep a clearance of at least 60 cm around the condenser;
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Avoid watering the unit directly when watering the garden;
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Have the coil cleaned at least once a year by a professional;
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Watch for unusual noises or performance losses—these are often the first signs of a problem.
A well-maintained heat pump can last up to 15 years while maintaining energy efficiency above 90% of its original capacity.
Result: comfort restored and performance regained in Boisbriand
After our intervention, the client noticed rapid and even cooling throughout the house. The KoolKing heat pump operated quietly, without surges or unexpected shutdowns.
This mission demonstrates the rigor and reliability of the AirGreen service: a precise diagnosis, an environmentally friendly intervention and local expertise covering all of Greater Montreal, Laval, Longueuil, the North Shore and the South Shore .
Why choose AirGreen for your HVAC repairs?
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Fast and professional service in all regions of Greater Montreal;
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Certified technicians specializing in wall-mounted heat pumps and multi-zone systems;
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Complete transparency on diagnosis and costs;
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Warranty on repairs and replaced parts.
At AirGreen, we don't just repair HVAC systems— we extend their useful life while maintaining your comfort and peace of mind.