Restoring power and performance to a dirty outdoor unit
At AirGreen , we emphasize an often overlooked point: regular cleaning of the outdoor unit of a heat pump or air conditioner is just as crucial as cleaning the indoor wall unit.
Recently, our team went to Brossard , on the South Shore of Montreal , to intervene on an LG outdoor unit that had a significant accumulation of dirt and dust, considerably reducing its performance.
On-site diagnosis: dust, debris and clogged fins
Upon arrival, our technician noted several typical signs of a lack of maintenance:
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Accumulation of dust and leaves on the protective grille and around the fan.
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Condenser fins obstructed , limiting heat dissipation.
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Traces of oxidation due to stagnant moisture.
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Reduced performance during operation, with a compressor that is noisier than normal.
These signs indicated a restriction of airflow through the condenser, forcing the compressor to work harder to maintain the temperature, which increases energy consumption and accelerates wear on the system .
Step 1: Preparing and securing the area
Before any intervention, our technician has:
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The power supply has been cut off to ensure complete safety.
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Cleared the area around the unit (tarpaulin, objects, dust).
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Protect the surrounding surfaces, especially the terrace and walls , using a waterproof tarp.
This step ensures that the cleaning is done without splashing or water seeping into the surrounding structures.
Step 2: Deep cleaning of the condenser
The cleaning was carried out according to a rigorous protocol:
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Application of a biodegradable cleaner specially formulated for heat exchange fins.
This product dissolves accumulated grease, dust and pollen without attacking metals or protective coatings. -
Gentle rinsing with water under controlled pressure , directed perpendicular to the fins so as not to bend them.
This method allows for the restoration of optimal airflow throughout the condenser. -
Fan cleaning : the blades were carefully brushed using a microfiber cloth and a neutral product, removing sticky deposits that could unbalance the rotation.
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Inspection of wiring and electrical connectors to ensure that no leaks or corrosion compromise system safety.
Step 3: Checking the drain and supports
Once the unit was clean, our team:
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Cleaned the drain outlet , often forgotten, to ensure free flow of condensate.
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The anti-vibration mounts were checked : slightly sagging, they were readjusted to correct the level of the device and prevent excessive noise.
This structural check is essential to prevent the transmission of vibrations to the building's facade and to extend the mechanical life of the system.
Step 4: Finishing and performance testing
After the condenser had completely dried, the system was powered back on for a full functional test :
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The fan was running silently , without whistling or rubbing.
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The condensation pressure had returned to normal levels.
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The temperature of the rejected air has decreased significantly, evidence of improved thermal efficiency .
The owner immediately noticed quieter operation and faster cooling in his home.
Why clean your outdoor unit every year?
A dirty outdoor unit acts like a radiator covered in dust: it loses its ability to transfer heat efficiently.
At AirGreen , we recommend a complete annual maintenance check , particularly before summer, to:
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Avoid compressor overheating ;
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Reduce electricity consumption (up to 15% savings);
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Prevent premature corrosion due to moisture and pollutants;
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Optimize the lifespan of the heat pump or air conditioner .
Our approach respects LG guidelines and Quebec HVAC standards, ensuring each client receives a safe, sustainable and compliant service.
AirGreen Expertise: Efficiency, Ecology and Professionalism
Each cleaning is performed with:
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Biodegradable and non-corrosive products ;
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Adjustable pressure tools to protect the fins;
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A complete visual inspection of all accessible components;
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And a detailed maintenance report given to the client at the end of the intervention.
This rigorous approach helps prevent breakdowns , reduce energy costs and guarantee optimal comfort throughout the year.
Final result: an LG unit in like-new condition
The cleaning of this LG outdoor unit in Brossard perfectly illustrates the importance of regular preventative maintenance .
Thanks to our intervention, the machine has regained its full efficiency , a minimal noise level and an impeccable appearance .
Professional cleaning is more than just a wash — it's a functional refurbishment , invisible but essential to the system's performance.