Essential maintenance to preserve the performance and durability of your HVAC systems
At AirGreen , we know that the outdoor units of wall-mounted heat pumps are subjected to harsh conditions throughout the seasons in Montreal, including dust, salt, soot, and atmospheric residue. Recently, our team worked in Saint-Laurent to perform a complete cleaning of two stacked outdoor units , one Lennox (top) and the other Hitachi (bottom).
This maintenance has restored their optimal performance and extended their lifespan, while ensuring maximum energy efficiency for the customer.
Initial inspection: diagnosis of fouling and loss of efficiency
Upon our arrival on site, we observed several typical signs of a need for maintenance:
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Visible accumulation of dust and dirt on the condenser fins.
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Traces of rust and mineral deposits on the lower frame, due to winter thaw cycles.
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Obstructed fans , reducing airflow.
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The lower unit also had moisture stains and a partially frozen drain , which hindered proper condensate drainage.
These conditions, although common, have a direct impact on the system's performance: an increase in electricity consumption and a notable decrease in heating in heat pump mode.
Step-by-step professional cleaning process
1. Securing and preparing the site
Before any handling, we disconnected the power supply to the units, then protected the electrical connections and sensors with waterproof covers. The surrounding surfaces were covered to prevent any splashing.
2. Mechanical cleaning and removal of the fins
Using a soft nylon brush and a compressed air blower , our technicians carefully cleared the fins of the exchanger to remove accumulated dust without deforming them.
3. Application of a biodegradable cleaner
We then sprayed a specialized, eco-friendly detergent to dissolve grease and organic deposits. This acid-free product is approved for aluminum surfaces and leaves no harmful residue.
4. Low-pressure rinsing
The rinsing was carried out with a controlled pressure water jet , allowing all impurities to be removed without risking damage to the condenser fins.
5. Check the drain and the fixing system
The clogged drain on the Hitachi unit was manually cleared and then tested to ensure proper drainage. The wall brackets were also inspected for sturdiness and angle of inclination , both essential for effective condensate drainage.
Results achieved: restored efficiency and optimized comfort
At the end of the cleaning process, both units were tested:
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The airflow has been significantly improved .
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The blowing temperature has returned to its optimal range.
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The noise level has decreased, a sign that the fan is freed from its constraints.
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The refrigerant gas pressures have stabilized within the values recommended by the manufacturers.
Thanks to this intervention, the customer once again benefits from stable and economical heating , without overconsumption of energy, while preserving the longevity of their equipment.
The importance of regular maintenance by AirGreen
Regular cleaning of outdoor heat pump units is not just about aesthetics. It helps to:
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Prevent costly breakdowns related to compressor overheating.
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Maintaining high energy efficiency , especially in winter.
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To avoid unpleasant odors and the spread of bacteria.
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Extend the lifespan of the device by several years.
At AirGreen , our technicians use precision tools and environmentally friendly products, in accordance with the recommendations of manufacturers such as Lennox and Hitachi .
We operate in Montreal, Laval, Longueuil, on the North Shore and the South Shore , to offer our clients a reliable, rigorous and professional HVAC maintenance service.
Conclusion :
This service call in Saint-Laurent demonstrates the importance of preventative cleaning of outdoor heat pump units . By entrusting your maintenance to AirGreen, you ensure your HVAC system delivers lasting performance, controlled energy consumption, and optimal comfort year-round.