A dirty outdoor unit, a source of reduced efficiency
During a recent call to Sainte-Thérèse, our AirGreen team was asked to perform a complete cleaning of an outdoor central heat pump . The client had noticed a significant drop in performance , increased fan noise , and higher electricity consumption over the past few weeks. At first glance, the unit, located on the side of the house, showed a substantial accumulation of dust, pollen, and rust on the condenser grille and fins. In addition, dense vegetation was growing around the unit, partially blocking airflow—a common but often underestimated factor.
Initial diagnosis: a condenser clogged with dirt and corrosion
Our technicians first carried out a complete visual inspection :
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The heat exchanger fins were covered with a thin layer of dirt and greasy deposits.
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The upper fan showed traces of rust, a sign of prolonged humidity.
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The surrounding branches and leaves were obstructing natural ventilation.
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The condensation drains contained small pieces of plant debris.
This type of obstruction reduces the heat dissipation capacity, forcing the compressor to work harder — which increases energy consumption and accelerates wear and tear on the system.
Steps in professional cleaning by AirGreen
1. Securing and preparing the construction site
Before any intervention, we cut off the power supply at the service panel and cleared the area around the heat pump to about 60 cm to ensure optimal access and adequate ventilation after cleaning.
2. External cleaning and vegetation removal
Using pruning shears and a compressed air blower, we cleared the vegetation surrounding the unit. This simple but essential step helps prevent the condenser from overheating and improves air circulation .
3. Low-pressure condenser cleaning
We then applied a biodegradable detergent designed for HVAC surfaces , before rinsing everything with clean water at low pressure to avoid damaging the delicate fins. This process removes ingrained dust and grease while restoring heat exchange capacity .
4. Cleaning the fan and drains
The upper fan was removed and then washed with a mild solution. The condensation drains were purged with compressed air to ensure proper drainage. This step helps prevent internal water leaks and mold growth .
5. Electrical verification and functional test
After complete drying, the team restored power to check the voltage, current, and refrigerant pressure . The compressor restarted without any abnormal noise, and the measured temperatures confirmed a return to optimal performance .
Results and recommendations to the client
After cleaning, the central heat pump regained smooth airflow and improved efficiency . The client immediately noticed that the indoor temperature stabilized more quickly and that the noise level had been reduced by half .
We recommended that he:
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Maintain a clear perimeter of 60 to 90 cm around the outdoor unit .
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Have a professional cleaning done annually before summer to prevent soiling.
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Regularly check that the drains and fins remain free of debris .
At AirGreen, we believe that regular maintenance is key to extending the lifespan of an HVAC system and reducing the risk of costly breakdowns . This type of intervention, while preventative, also improves air quality and reduces energy consumption—a double benefit for both comfort and your wallet.
Why choose AirGreen for your HVAC system cleaning
Our team uses only environmentally friendly products and techniques that comply with manufacturers' recommendations . With a rigorous and respectful approach to equipment, we ensure thorough cleaning without compromising electrical or electronic components. Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our mobile team responds quickly and efficiently to maintain your residential and commercial HVAC systems .