An unexpected breakdown in an industrial loft: our team to the rescue
At AirGreen , we are regularly called upon to intervene in unique residential environments in Montreal. This time, our team specialized in HVAC system repairs traveled to an industrial loft in the Southwest district . The client, a young professional working from home, had noticed for a few days that his Midea wall-mounted heat pump was no longer blowing cold air, despite a normal display on the remote control.
On-site diagnosis: a system that seemed to work… but without performance
Upon our arrival, we carried out a series of quick checks:
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Wall-mounted indoor unit : active ventilation, but warm air flow.
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Outdoor unit : compressor not running, despite the cooling request.
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Refrigerant circuit pressure : abnormally low.
These signs revealed a possible refrigerant (refrigerant gas) leak , a fairly common problem on wall-mounted units installed several years ago, especially when preventive maintenance has not been performed recently.
Step 1: Locate the leak
Using an electronic detector and professional soap bubbles, our technician quickly located the source of the problem:
➡️ A micro-crack on the copper connection of the outdoor unit , probably caused by repeated vibrations and slight tension on the refrigerant pipe.
We then have:
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Isolated the affected section of the circuit.
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Repaired the joint using high temperature silver solder.
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Checked the system's integrity using a nitrogen pressure test.
No leaks detected after 20 minutes of observation — the circuit was now leak-proof.
Step 2: Refrigerant recharge and return to service
After the repair, our team carried out a complete recharge with R410A refrigerant , respecting the factory charge indicated by the manufacturer Midea. We then:
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Restarted the system in air conditioning mode.
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Checked the blowing temperature : 11°C at the outlet, compared to 26°C before intervention.
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Checked the power consumption : stable and compliant.
Result: the heat pump regained its optimal performance , once again ensuring the customer's comfort for the hot days to come.
Step 3: Maintenance tips to prevent future breakdowns
As always, we took the time to explain some good maintenance practices to the customer:
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Clean the wall unit filters every two months.
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Schedule a complete annual maintenance , ideally in the spring, including condenser cleaning, gas check, and electrical inspection.
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Watch for unusual noises or performance losses , which are warning signs of a problem.
At AirGreen, we believe that well-planned preventative maintenance can prevent up to 80% of major breakdowns and extend the life of your heat pump.
A unique working environment: the challenges of Montreal lofts
The client's loft, with its high ceilings, large windows, and brick walls , presented a particular challenge for temperature control. In this type of environment, a well-calibrated wall-mounted heat pump is essential for maintaining a stable temperature without excessive energy consumption.
Our technicians have also adjusted the airflow direction to optimize circulation throughout the room, reducing hot and cold spots. This type of precise adjustment, often overlooked, significantly improves thermal comfort and energy efficiency .
Why choose AirGreen for your HVAC repairs in Montreal?
Our expertise covers all brands of wall-mounted heat pumps : Midea, Fujitsu, Gree, Sharp, Goodman, Trane, Zephyr, and many others .
We are an authorized distributor and installer for many of them, which guarantees repairs that meet manufacturer standards and original parts .
Our interventions are distinguished by:
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A precise and transparent diagnosis.
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Durable and safe repairs.
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Fast service throughout Montreal, Laval, the North Shore and the South Shore.
Final result: comfort restored and customer satisfied
A few hours after our departure, the customer confirmed that his Midea wall-mounted heat pump was working perfectly and that the indoor temperature had become stable and pleasant again.
For our team, each service call represents an opportunity to combine technical expertise and commitment to customer satisfaction , two fundamental values at AirGreen .
In summary
A small leak can cause a wall-mounted heat pump to completely lose its performance. Thanks to our thorough diagnosis and rapid intervention, the Midea system in this southwest Montreal loft was able to regain full efficiency—proof that every detail counts in the performance of an HVAC system.