Refrigerant recharge performed with precision on an urban rooftop
In Côte-des-Neiges–Notre-Dame-de-Grâce , the AirGreen team was recently called to work on a Gree wall-mounted heat pump installed on the roof of a residential building. The client reported a noticeable drop in performance in air conditioning mode , particularly on the hottest days. The outdoor unit appeared to be working, but the indoor air temperature remained lukewarm—a typical sign of a lack of refrigerant.
Diagnosis: a minor leak, but with significant consequences
Our technicians carried out a complete diagnosis of the refrigeration circuit . Through a pressure test and the use of an electronic detector, we confirmed a micro-leak on a flare connection at the outdoor condenser. This type of leak is common when the installation is subject to constant vibrations, as is often the case on roof structures in urban environments.
Here are the technical findings:
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Abnormal static pressure of R32 refrigerant, indicating partial loss.
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Slightly frosted liquid line , symptom of charge imbalance.
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No trace of excessive oil , which made it easier to precisely locate the leak.
System Repair and Recharge Steps
Once the leak was identified, our team undertook the following work:
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Tightening and re-brazing of flare fittings to ensure a perfect seal.
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Complete vacuuming of the system for over 40 minutes using a high-efficiency pump to remove any residual moisture or air.
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R32 refrigerant recharge according to manufacturer's specifications (exact weight charge, adjusted on electronic scale).
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Checking operating pressures and monitoring blowing and discharge temperatures.
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Observation of the behavior of the compressor and the electronic expansion valve , confirming the stability of the refrigeration cycle.
Measurable results and immediate satisfaction
After restarting the system, the results were clear and immediate:
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Indoor blowing temperature at 7.3°C after 10 minutes of operation.
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Standardized electrical consumption , sign of a compressor operating at nominal load.
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Total absence of abnormal noise or vibration , thanks to the reinforced fixing of the pipes.
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Stable discharge temperature , guaranteeing optimal performance in both air conditioning and heating.
The client noted an immediate improvement in interior comfort and a feeling of freshness found in all rooms.
Preventive maintenance: the key to lasting performance
Most problems with wall-mounted heat pumps stem from neglected maintenance or failure to check the refrigerant charge . To prevent similar failures, our technicians recommend:
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A complete annual inspection , including checking pressures and leaks.
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Cleaning the outdoor coil to maintain optimal heat exchange.
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A visual inspection of the insulation and pipe fixings , often damaged by UV rays or bad weather.
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Monitoring noise or temperature variations inside — the first signs of a load imbalance.
With these best practices, a Gree heat pump can operate efficiently for more than 15 years .
AirGreen expertise: rigor and reliability on all types of installations
This intervention perfectly illustrates our approach: high-level technical expertise combined with careful execution . At AirGreen, we don't just recharge a system — we analyze, correct, and optimize.
Our technicians are trained to work on all major brands on the market, including Gree, Midea, Fujitsu, Sharp, LG, Mitsubishi, and Daikin .
Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our teams provide fast, professional and lasting service, guaranteeing your comfort in all seasons.
Summary of the intervention
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Brand: Gree
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System type: Wall-mounted heat pump (mini-split)
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Location: Côte-des-Neiges–Notre-Dame-de-Grâce, Montreal
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Problem: Minor leak of R32 refrigerant causing decreased performance
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Solution: Tighten, vacuum and completely recharge the system
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Result: Cooling restored, energy efficiency optimized
At AirGreen , every service call is a precision mission. Our priority: restoring your HVAC system to its full performance and reliability , while ensuring your long-term comfort.