Comfort in danger in the heart of the city center
A client living in a modern condo in Montreal's Ville-Marie district contacted us after noticing that his Sharp wall-mounted heat pump was no longer producing cold air, despite the thermostat displaying a normal setting. In the early summer, the temperature in his living room was exceeding 27°C—a problem that needed to be addressed immediately.
At AirGreen , we know how crucial a wall-mounted heat pump is in Montreal condos: compact, quiet and efficient, it ensures constant comfort throughout the year. We therefore dispatched a specialized technician to the site for a complete and rapid diagnosis .
Accurate diagnosis: an abnormal temperature difference
Upon arrival, our technician used a professional infrared thermometer to measure the discharge temperature. The display showed 20.3°C at the air outlet, while the system setpoint was 18°C . This difference indicated a compressor performance problem or insufficient refrigerant pressure .
After removing the indoor unit cover, a visual inspection revealed that the heat exchanger was partially clogged with fine dust and a slight greasy deposit. This type of buildup, common in urban environments, reduces heat exchange and places increased strain on the compressor motor.
Steps of the AirGreen intervention
1. Checking the refrigerant charge (R-32)
We connected our digital pressure gauges to the system to measure the operating pressure. The readings were 15% lower than normal, confirming a microleak of R-32 refrigerant . This type of leak is not uncommon on wall-mounted systems installed for more than five years.
2. Locating and sealing the leak
Using an electronic leak detector, we identified seepage at the flare fitting connecting the outdoor condenser to the indoor coil. After draining the line and replacing the gasket, we performed a nitrogen pressure test to verify the strength of the repair.
3. Complete system recharge
Once the circuit was sealed, we recharged the system to the exact amount prescribed by the manufacturer Sharp . This precise calibration ensures optimal performance and prevents short cycles or excessive power consumption.
4. Complete cleaning of the indoor unit
We then dismantled and thoroughly cleaned the centrifugal fan , the exchanger fins , as well as the condensate tray . An antibacterial treatment was applied to prevent mold and bad odors.
5. Final performance verification
After restarting, the infrared thermometer now indicated a stable supply air temperature of 14.7°C —perfect performance for this type of unit. The client immediately felt the difference: even, quiet cooling throughout his condo.
Results and recommendations
This repair made it possible to:
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Restore the original performance of the Sharp heat pump.
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Reduce electricity consumption by approximately 20%.
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Extend the life of the compressor , often damaged by insufficient refrigerant charge.
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Eliminate the risk of future leaks by completely tightening the circuit.
We also recommended annual preventative maintenance to the client, which is particularly essential for wall units installed in downtown buildings where dust and fine particles accumulate more quickly.
AirGreen expertise serving Montrealers
Every day, our technicians work in the neighborhoods of Montreal, Laval, Longueuil, the North Shore and the South Shore to ensure the proper functioning of residential and commercial HVAC systems.
Our approach is based on three principles:
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Rigorous diagnosis using professional tools (thermal camera, infrared thermometer, leak detectors).
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Complete transparency regarding the causes of the problem and the proposed solutions.
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Sustainable quality : only original manufacturer parts are used during repairs.
Thanks to this method, AirGreen has become a reference for the repair and maintenance of wall-mounted heat pumps from Sharp, Gree, Fujitsu, Midea and other trusted brands throughout the greater metropolitan area.
Why trust AirGreen for your wall-mounted heat pump?
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Rapid intervention in all boroughs of Montreal.
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Certified technicians trained on new ecological refrigerants (R-32, R-410A).
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Guaranteed service and complete inspection after each repair.
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Personalized advice to optimize energy performance and reduce your electricity costs.
Conclusion: comfort rediscovered in Ville-Marie
This repair on a Sharp wall-mounted heat pump perfectly illustrates our expertise: precision, speed, and efficiency. By restoring the unit to optimal performance, we enabled our client to regain stable, energy-efficient indoor comfort —even in the heart of Montreal.
At AirGreen , every service call is treated with the same rigor, whether it's a condo in the city center or a house in the suburbs.