A dirty outdoor unit that threatened the system's efficiency
During this service call in Saint-Lambert , our AirGreen team was called in to perform a complete cleaning of a central air conditioner installed outside a single-family home. The unit, located against the back wall of the house, showed clear signs of advanced dirt and grime : the condenser fins were covered with black dust and stuck-on residue, significantly reducing airflow.
This type of buildup is typical when the system operates for several seasons without maintenance. It leads to decreased energy efficiency , slower cooling , and eventually, compressor overload , which can reduce the air conditioner's lifespan.
Symptoms observed before the procedure
The client had noticed several recurring problems:
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Cooling is less efficient inside.
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Noisy outdoor unit and hot to the touch .
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Significant increase in the electricity bill .
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Dusty smell when the system starts up.
These symptoms are characteristic of a dirty condenser, where heat exchange is no longer occurring properly.
Cleaning steps performed by AirGreen
1. Inspection and security
Before any work began, we disconnected the power supply and performed a complete visual inspection of the unit. This allowed us to identify any obstructed areas and ensure safe cleaning.
2. Removal of debris and initial dusting
We removed the leaves, insects, and dust trapped in the protective grille and on the fins. Using a soft brush and a compressed air blower, we removed most of the surface dirt without damaging the condenser's delicate metal.
3. Application of the biodegradable cleaner
An environmentally friendly solution based on natural enzymes was then sprayed over the entire surface of the fins. This product dissolves grease, soot, and mineral deposits while being safe for plants and animals around the unit.
4. Low-pressure rinsing
After a waiting period of approximately 10 minutes, we proceeded to a thorough rinse with lukewarm water and low pressure , which restored the shine of the metal and removed the micro-particles that were obstructing the airflow.
5. Cleaning the fan and the cover
The upper fan was disassembled and then cleaned by hand , as the blades had a thin layer of dust that could have disrupted its rotation. The top cover was also washed to prevent debris from returning.
6. Functionality check
Once the unit was reinstalled, we tested the entire system . Refrigerant pressures, air supply temperature, and operating noise were measured, and everything was back within specifications. The air conditioner's performance was fully restored .
Results: restored efficiency and increased comfort
After our cleaning:
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The airflow has increased significantly.
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The compressor noise has decreased.
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The house's cooling time has been reduced.
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The customer was able to notice an immediate difference in interior comfort.
This type of thorough cleaning can improve the energy efficiency of an HVAC system by up to 25% , while extending its lifespan by several years.
AirGreen Maintenance Tips
We recommend that our clients:
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Clean their outdoor unit at least once a year , ideally in the spring.
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Maintain a minimum clearance of 60 cm around the condenser .
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Avoid placing objects, plants or fences too close together.
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Visually check the condition of the fins each season.
Our technicians follow manufacturers' recommendations and use professional methods to ensure safe and long-lasting maintenance.
At AirGreen , we guarantee professional, efficient, and environmentally friendly HVAC cleaning services in Montreal, Laval, Longueuil, and on both the North and South Shores. Your comfort and the performance of your air conditioner are our priority.