Unit blocked by curtains: a revealing service call
At AirGreen , we are often called out for situations that seem trivial but hide very specific technical causes. This is exactly what happened in LaSalle , where a customer contacted us about a noticeable drop in performance of his Haier wall-mounted air conditioner . The unit, installed just above a patio door, seemed to be working, but the interior temperature was no longer dropping as much as before.
Initial diagnosis: obstructed airflow
Upon our arrival, our certified technician immediately noticed a crucial detail: the thick, knotted curtains installed directly under the unit. This type of obstruction prevents proper air circulation , forcing the compressor and fan to work under overload.
After an initial performance test and a reading of the blowing temperature, we noted:
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a greatly reduced air flow ,
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an outlet temperature of 16°C instead of the expected 12°C,
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and dust accumulation in the filter and turbine.
Technical intervention
Our technicians carried out a complete cleaning of the filter and the blower roller , before recommending that the customer rearrange the space under the unit . A minimum clearance of 50 cm under a wall-mounted air conditioner is crucial to allow for even distribution of cold or hot air.
Next, a refrigerant pressure check confirmed that the system was leak-free . However, the indoor coil was cleaned to remove accumulated grease and dust deposits, common in kitchen or dining room environments near a patio door.
Result: restored performance and immediate comfort
After cleaning and repositioning the curtains, the unit returned to blowing at 11.8°C and smooth air circulation in the room. The customer immediately noticed the difference: a uniform temperature and quieter operation .
Our recommendations to avoid this type of problem
We remind our customers to:
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leave sufficient clearance under the wall unit (at least 50 cm),
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clean the filters every 30 days during the summer season,
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avoid heavy curtains or thick blinds that block airflow,
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schedule annual preventative maintenance to maintain performance and extend system life.
AirGreen Expertise: Much More Than Just a Repair
This service call in LaSalle illustrates our proactive approach: identifying not only the symptom, but the real cause of the problem . Every diagnosis we perform aims to prevent future breakdowns and improve the energy performance of residential HVAC systems.
At AirGreen, our mission is to ensure that every customer in Montreal, Laval, Longueuil, the North Shore and the South Shore enjoys optimal comfort all year round — whether it's for a repair , preventative maintenance or a complete installation .