A fast and accurate service call to a residential customer in Laval
At AirGreen , we were recently called to intervene in the peaceful Sainte-Dorothée area of Laval for a customer who was experiencing a recurring problem with their Midea wall-mounted heat pump . The unit, installed for several years on a gray brick side wall, was showing signs of poor performance in air conditioning mode despite regular maintenance.
Our team of certified HVAC technicians went on site to diagnose the situation and restore the customer's comfort before the arrival of another heat wave.
Initial diagnosis: loss of efficiency and unusual noise
Upon arrival, we noticed that the outdoor unit—a 12,000 BTU Midea compressor , using R-32 refrigerant—was installed on a stable wall mount near a basement window. However, a metallic vibrating noise could be heard upon turning it on, accompanied by a noticeable drop in cooling performance inside the house.
Our initial checks revealed several clues:
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A buildup of dust and debris on the condenser.
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A slight obstruction of the condensate drain , causing moisture to return to the evaporator.
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An abnormally low refrigerant gas level , indicating a possible leak.
Step 1: Thorough Inspection and Pressure Testing
Before any refill, our technicians performed a nitrogen leak test to confirm the presence of a leak. The pressure gauge indicated a slow loss of pressure, located near a flare connection on the liquid hose. This type of leak is quite common on systems that have undergone several freeze/thaw cycles over the seasons in Quebec.
After tightening and replacing the seal, we performed a complete vacuum to remove any internal moisture before recharging the system.
Step 2: System Recharge and Calibration
Once the leak was confirmed, we recharged the R-32 gas according to Midea's specifications. Thanks to our electronic recovery station, we were able to restore the exact nominal pressure recommended by the manufacturer.
The system was then tested in air conditioning and heating mode . Measurements showed a return to normal performance:
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Indoor blowing temperature: 12°C (cooling mode)
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Suction pressure: 120 psi
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Discharge pressure: 380 psi
Step 3: Noise reduction and installation stabilization
The metallic noise we observed was actually caused by a slight vibration of the wall bracket, amplified by contact with the brick. We added rubber anti-vibration pads and tightened the anchor bolts.
Result: silent operation, without parasitic vibration, and better mechanical stability of the outdoor unit.
Maintenance advice given to the customer
Before concluding the intervention, we took the time to advise our client on good maintenance practices for his heat pump:
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Clean the internal filter every 30 to 45 days during the summer season.
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Visual inspection of the outdoor unit to ensure that no obstructions (leaves, grass, branches) are preventing air circulation.
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Complete annual maintenance by an AirGreen technician to maintain energy efficiency and prevent micro-leaks.
We also noted that the system was eligible for a Hydro-Québec grant program in the event of future replacement with a more efficient ENERGY STAR heat pump.
Final result: restored comfort and optimized performance
After our intervention, the Midea heat pump returned to its original performance. The house now cools quickly and evenly, without excessive electricity consumption. The customer noticed a significant reduction in outside noise and increased stability of the indoor temperature .
This type of service perfectly illustrates AirGreen 's approach:
🔧 rigorous diagnosis ,
⚙️ lasting repair ,
🌿 energy optimization ,
💬 personalized support .
Why choose AirGreen for your HVAC repairs in Laval?
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RBQ certified technicians trained on all major brands (Midea, Gree, Sharp, Fujitsu, Goodman, etc.).
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Fast service covering the entire Laval region, Montreal, the North Shore and the South Shore .
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Fully equipped vehicles allowing most repairs to be carried out on the first visit.
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Satisfaction guarantee on every intervention.
At AirGreen , every service call is an opportunity to demonstrate our commitment to the quality and reliability of Greater Montreal's heating and air conditioning systems.