When an aging unit shows signs of fatigue
At AirGreen , we are often called to diagnose and repair wall-mounted air conditioning systems that have been installed for over a decade. This was the case during our recent intervention in Saint-Lambert , on the South Shore of Montreal , where a customer contacted us about a Fujitsu wall-mounted air conditioner that was no longer properly cooling his living room during hot summer days.
Diagnosis: loss of performance and internal fouling
Upon arrival, we noticed that the wall unit—a Fujitsu model from the mid-2000s—was exhibiting several symptoms typical of a unit requiring extensive maintenance and upgrading :
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Low airflow despite fan at maximum speed
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Air outlet temperature warmer than expected
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Accumulation of dust and debris inside the heat exchanger
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Excessive condensation on the lower face of the unit
Our certified technicians performed a complete system diagnosis , including:
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Checking refrigerant pressures (R-410A)
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Outdoor Compressor Inspection
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Testing the electronic control board
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Measurement of inrush current at start-up
The verdict: The system suffered from advanced evaporator fouling , which drastically reduced heat transfer capacity, and a slightly low refrigerant level , causing inconsistent performance.
The intervention: deep cleaning and refrigerant recharge
We partially disassembled the indoor unit to access the evaporator coil. After protecting the surrounding surfaces, a complete chemical cleaning was performed to remove deposits that had accumulated over several seasons.
Afterwards :
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A vacuum was drawn to ensure the circuit was watertight.
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An R-410A refrigerant recharge was carried out according to the manufacturer's specifications Fujitsu.
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The air filters have been replaced, and the blower blades cleaned.
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A full operational test confirmed a return to full system efficiency.
Result: restored performance and satisfied customer
After the repair, the Fujitsu unit returned to a blowing temperature of 9°C and optimal airflow . The customer, who was worried about having to replace his unit, was pleasantly surprised by the difference: his wall-mounted air conditioner regained efficiency almost equivalent to that of a new unit.
We also took the time to review preventative maintenance with the owner, including:
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Clean filters every 4 to 6 weeks
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Annual inspection of refrigerant pressures
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Checking the condensate drain to prevent overflows
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Planning an AirGreen seasonal maintenance , before each summer
Why Choose AirGreen for Your HVAC Repairs
Across the South Shore , Montreal, and Laval, AirGreen stands out for its rigorous and humane approach to HVAC repair . Every service call is an opportunity to assess the system as a whole, not just the visible symptom. This often prevents future breakdowns and extends the life of units by several years.
Our technicians:
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Are trained on the brands Fujitsu, Gree, Midea, Sharp, Lennox and Bosch
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Use accurate electronic diagnostic tools
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Follow environmental protocols for handling refrigerants
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Always provide a clear and transparent explanation of the interventions carried out
The final word: maintenance saves money
A well-executed repair is often the best investment before considering replacement. In this specific case in Saint-Lambert , the customer saved several thousand dollars by extending the life of his existing appliance.
At AirGreen, we believe that regular maintenance and professional repairs can transform an aging unit into a system that will continue to perform for years to come.