An outdoor unit covered in dirt: a typical case in Saint-Laurent
At AirGreen , we regularly provide complete cleaning services for outdoor wall-mounted heat pump units in Saint-Laurent . These units, often installed outdoors under partial shelters or against brick walls, are exposed to dust, pollen, cobwebs, urban soot, and moisture deposits. The image above perfectly illustrates a typical case: a unit covered in thick grime , especially on the top, with black streaks and dust stuck to the metal casing.
This type of fouling is not merely aesthetic: it can slow down heat dissipation , cause the compressor to overheat , and reduce the system's energy efficiency by up to 25%. Furthermore, dirt accumulated on the fins and screws can promote premature corrosion of the unit.
Diagnosis before cleaning
During our initial inspection, we noted:
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A significant accumulation of dust and grime across the entire exterior surface;
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Partially obstructed fins , reducing airflow;
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Small traces of stagnant moisture under the chassis;
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Customer reported less effective cooling on hot days.
The heat pump in question is an outdoor "split" type unit used for an indoor wall system , a standard residential model commonly installed in Montreal and on the North Shore. The label visible on the cover confirms that it is a 230V powered unit, typical of domestic installations.
Steps in professional cleaning
At AirGreen, we follow a complete cleaning protocol that respects manufacturer recommendations and electrical safety rules.
1. Power outage
Before any work begins, we disconnect the power supply to ensure complete safety. This is a mandatory step before handling metal components and using pressurized water.
2. Partial dismantling and protection
We remove the protective grilles and protect the internal electrical components with waterproof caps . This prevents any water from seeping into sensitive areas of the compressor and wiring.
3. Surface cleaning
Using a biodegradable degreaser and a soft brush , we scrubbed the external surface to remove soot, grease, and black deposits. This first step quickly restores the bodywork to its original appearance.
4. Fin and condenser washing
The core of the work involves cleaning the condenser . We use a low-pressure water jet directed against the airflow to remove dust trapped between the fins. This process significantly improves airflow and thermal performance .
5. Check the drain and condensation tray
Even though this unit is outdoors, a partial drain allows for condensate drainage. We therefore inspected and flushed the drain to prevent any risk of blockage or stagnant water that could cause rust.
6. Application of an antibacterial treatment
To prevent the growth of mold and microorganisms, we apply an environmentally friendly disinfectant to the internal surfaces. This treatment reduces odors and protects the appliance in the long term.
7. Drying and restarting
Once everything is perfectly clean, we let it dry naturally for about 30 to 45 minutes , then we reconnect the power supply to perform a performance test : refrigerant pressure, airflow, operating noise and outlet temperature.
Results after intervention
The result is immediate:
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The unit regains its clean and uniform appearance ;
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The condensation temperature has returned to normal;
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The customer noticed an improvement in cooling power from the first hour;
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The system is now quieter and more energy-efficient .
On average, this type of cleaning allows for energy savings of 10 to 20% depending on the initial condition and conditions of use.
Why should you have your outdoor heat pump cleaned?
Even if it seems to be working normally, a dirty heat pump uses more electricity and wears out faster. Dirt acts as a thermal barrier, preventing heat exchange and forcing the compressor to work harder. In the long term, this can cause:
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Premature engine failures ;
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Unusual noises due to fan imbalance;
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A reduction in the lifespan of the equipment;
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A significant increase in the electricity bill .
At AirGreen, we recommend a complete professional cleaning once a year , ideally in spring or early autumn. This ensures optimal performance and healthier indoor air.
AirGreen's expertise: safety, efficiency and respect for your equipment
Our team is RBQ certified and uses specialized tools designed for cleaning residential and commercial HVAC systems . We serve the entire Greater Montreal area: Saint-Laurent, Laval, Longueuil, North Shore, and South Shore . Every cleaning is documented, performed in accordance with industry standards, and aims to extend the lifespan of your equipment.
Thanks to our experience, we know how to adapt our techniques according to the type of unit, the brand, and the installation environment. We always prioritize environmentally friendly products that do not damage metal surfaces or the paint on the hood.
In conclusion
This heat pump cleaning in Saint-Laurent perfectly illustrates the importance of regular preventative maintenance . By removing accumulated dirt, we not only restored the system's energy efficiency but also prevented costly long-term damage .
At AirGreen , every intervention aims for the same objective: to offer our clients optimal comfort, sustainable performance and total peace of mind .