Essential maintenance under a terrace to revive a neglected system
At AirGreen , we were recently called to Sainte-Julie , on Montreal's South Shore, for a complete cleaning of a central heat pump installed under a wooden deck . This particular configuration, while practical for protecting the unit from the elements, often presents a problem: lack of air circulation and the accumulation of dust, moisture, and plant debris around the outdoor unit.
An outdoor unit completely obstructed
Upon arrival, the heat pump was visibly covered in dust, dirt, and organic deposits . The heat exchanger fins were clogged, preventing proper heat dissipation. The client complained of very low efficiency and abnormal noise coming from the unit. Upon closer inspection, we determined that the unit had not been serviced for several years, and that the confined and poorly ventilated space under the deck had exacerbated the deterioration.
Step 1: Inspection and securing of the unit
Before any intervention, we have:
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Power supply cut off for safety.
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Inspected the refrigeration lines and electrical connections.
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Checked the stability of the concrete slab, which had sunk slightly due to time and humidity.
Step 2: Deep cleaning of the fins and coil
Using our biodegradable cleaning product specifically designed for HVAC systems, we proceeded to:
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A low-pressure wash to remove dust without damaging the fins.
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A thorough rinse with lukewarm water to remove all traces of ingrained dirt.
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Manually brush the most soiled sections with a soft-bristled brush.
This step restored the thermal conductivity of the coil, immediately improving the energy efficiency of the system.
Step 3: Cleaning the ducts and checking the drain
Exterior cleaning alone wouldn't have been enough without additional interior maintenance . Therefore, we have:
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Cleaned the air filters and the fan in the indoor module .
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Checked and unclogged the condensation drain , which is often neglected and prone to mold growth.
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An antibacterial treatment was applied to prevent unpleasant odors and ensure optimal air quality.
Step 4: Performance testing and final calibration
After a thorough cleaning, we restarted the system and measured the inlet and outlet temperatures. Result:
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23% improvement in cooling efficiency .
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Significant reduction in noise due to improved air circulation.
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No abnormal vibrations detected.
The benefits of regular maintenance
This case perfectly illustrates why annual cleaning of HVAC systems is essential, especially when the unit is installed in a confined or semi-enclosed space . Professional maintenance prevents:
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Electrical overloads due to poor ventilation.
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The risks of premature compressor failure .
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The loss of energy efficiency , which can reach up to 30%.
At AirGreen , we always emphasize the importance of preventative cleaning, carried out with environmentally friendly products and according to the manufacturer's standards .
End result: a more efficient heat pump and a satisfied customer
At the end of our intervention in Sainte-Julie, the client noticed a significant difference in cooling power and operational stability . The unit, previously noisy and clogged, now operates quietly and efficiently .
Thanks to this comprehensive maintenance, the system is ready to face the temperature variations of the South Shore — with optimal performance and extended durability .
AirGreen , your trusted HVAC partner in Montreal, Laval, Longueuil, North Shore and South Shore , is committed to providing comprehensive and sustainable maintenance services for all your heating, ventilation and air conditioning systems.