A thorough cleaning and essential repair to restore comfort
At AirGreen , we are often called upon for wall-mounted heat pump repair and maintenance across the South Shore of Montreal . This service in Saint-Lambert perfectly illustrates the importance of regular maintenance and thorough inspection, especially for LG Dual Inverter units, which are very popular in modern apartments and condos.
During this call, our technician was tasked with diagnosing a noticeable drop in performance — the unit was no longer cooling efficiently and was giving off an unpleasant odor when turned on.
Diagnosis: Dirt buildup and condensate drain blockage
Upon our arrival on site, a visual examination revealed several clues:
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Presence of traces of humidity on the wall below the unit.
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Insufficient flow from the condensate drain , suggesting a possible blockage.
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Visible accumulation of dust and mold on the indoor evaporator.
The unit, a 12,000 BTU LG Dual Inverter model , also showed signs of loss of thermal efficiency : the fan was spinning normally, but the blowing temperature remained too high.
After a series of electrical tests and temperature measurements, the diagnosis was clear:
the drain was partially blocked , causing moisture to return inside, and the heat exchanger required a complete coil cleaning .
Intervention: professional cleaning and unblocking of the drain
At AirGreen, we use professional and safe methods to ensure a complete cleaning of HVAC wall units without compromising the internal electronics.
Here are the main stages of the intervention carried out in Saint-Lambert:
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Installation of a waterproof washing cover , specially designed to protect the wall and collect the rinsing water (as seen in the photo).
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Applying a coil-safe cleaner (biodegradable disinfectant solution) to the evaporator to dissolve dust, grease and mold.
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Low pressure rinse to remove all accumulated residue.
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Cleaning the condensate tray and completely unblocking the drain using an air pump and vinegar solution.
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Centrifugal fan inspection , blade cleaning and balancing check.
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Restart and performance tests : measurement of air inlet and outlet temperatures, control of refrigerant pressure.
Immediate result: the unit regained powerful air flow , optimal blowing temperature and no water leaks .
Result: healthier air and improved performance
As soon as the intervention was completed, the client noticed an immediate difference in comfort . The blown air was cooler, drier and odorless. In addition, the heat pump operated at a lower noise level , demonstrating better fan balance.
Maintenance and repair allowed:
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To restore the energy efficiency of the heat pump.
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To prevent premature corrosion of the evaporator.
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To reduce the risk of future water leaks .
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To improve indoor air quality , essential in a kitchen or open space.
The importance of regular maintenance of your wall-mounted heat pump
An LG Dual Inverter heat pump is a powerful and energy-efficient system, but it requires rigorous maintenance to maintain its efficiency. At AirGreen, we recommend:
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Professional cleaning once a year, ideally before summer.
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A monthly visual check of the filters and drain.
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Preventive maintenance to avoid problems related to humidity and microorganisms.
Dirt buildup in the evaporator and fan reduces heating or cooling capacity, increases electricity consumption, and can even damage the electronic board.
AirGreen: your HVAC partner on the South Shore and in Montreal
Whether you live in Saint-Lambert, Brossard, Longueuil, Sainte-Julie or La Prairie , our certified technicians respond quickly to repair, maintain and optimize your HVAC systems .
We work with all the major brands— LG, Gree, Fujitsu, Sharp, Midea, Goodman, Lennox, Bosch, Hitachi , and many more. Our approach is simple: transparency, efficiency, and sustainability .
Every repair or cleaning is an opportunity to restore your device to its original power, while extending its lifespan.
Conclusion: performance comes through prevention
This LG Dual Inverter wall-mounted heat pump repair in Saint-Lambert demonstrates how professional maintenance can transform the performance of an HVAC unit. In just a few hours, our AirGreen team cleared the blockages, disinfected the unit, and restored its efficiency, much to the customer's relief.
At AirGreen, our priority is clear: ensuring your comfort, your safety and the longevity of your equipment through precise, clean and sustainable interventions.