A heat pump suspended under cover: a typical case of overheating in Sainte-Thérèse
When a customer from Sainte-Thérèse , on Montreal's North Shore , contacted us, their Gree wall-mounted heat pump was no longer blowing cold air. Installed on a wall bracket under a patio shelter, this configuration, while practical for protecting the compressor from the elements, had one disadvantage: poor air circulation around the condenser .
At AirGreen , we often see this type of situation — outdoor units installed too close to a roof or structure, which ultimately leads to performance issues and compressor overheating .
Complete diagnosis: a compressor stifled by lack of ventilation
Upon our arrival, our technicians carried out a methodical inspection:
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Abnormally high discharge temperature , a sign of limited heat exchange.
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Condenser fins partially clogged with dust and cobwebs, reducing airflow.
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R-410A refrigerant pressure above standards: a clear indicator of cycle overheating.
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Intermittent noise from the exterior fan , caused by a tired motor that has repeatedly overheated.
After these checks, the diagnosis was unequivocal: the condenser fan had to be replaced and the installation area required correction to improve ventilation .
On-site repair: fan replacement and installation adjustment
We started by turning off the power and removing the condenser cover . Once the motor was disassembled, we found that its shaft was partially seized by moisture. The replacement was carried out with an original Gree motor , which was perfectly compatible.
During the repair, we:
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Cleaned the coils at high pressure with a specialized biodegradable product.
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Checked the wall mounting brackets : some had flexed slightly over time, which could create vibrations. We tightened and reinforced them.
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Added anti-vibration rubber spacers to limit noise and extend engine life.
Once everything was reassembled, we powered the system back up and performed a full test. The fan started without any unwanted noise, and the refrigerant temperature returned to ideal parameters.
Result: restored performance and secure installation
A few minutes after restarting, the heat pump was blowing air at 11°C , which corresponds to optimal performance for a Gree wall-mounted system in air conditioning mode. The compressor returned to a stable cycle , without untimely shutdowns.
We also recommended some simple adjustments to the client:
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Remove two boards from the patio roof above the unit to allow better air circulation.
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Maintain a minimum distance of 30 cm between the top of the condenser and any obstacle.
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Have the coils cleaned every spring before the hot season.
A Lesson for Residential Shed Installations
Outdoor wall units installed under semi-enclosed structures are common in Sainte-Thérèse, Blainville, and Boisbriand. However, this type of location must be carefully considered . An HVAC unit requires a constant flow of air to remove heat. Without this, the compressor becomes exhausted, energy consumption increases, and the equipment's lifespan decreases.
At AirGreen , our technicians always take into account the unit's environment —orientation, clearances, sun exposure—in order to optimize the system's overall performance.
AirGreen Expertise: rapid intervention on the North Shore
Whether you are in Sainte-Thérèse , Boisbriand , Blainville or Terrebonne , our team covers the entire North Shore as well as Montreal, Laval, Longueuil and the South Shore . We guarantee precise, durable repairs that meet the strictest HVAC standards.
Our approach is based on three principles:
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Rigorous diagnosis before replacing parts.
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Exclusive use of original components.
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Optimization of energy efficiency after repair.
Thanks to this method, our clients benefit from renewed comfort and lasting peace of mind.