A neglected outdoor unit that has regained its full efficiency thanks to a thorough cleaning
At AirGreen , we often encounter outdoor heat pumps that suffer from a lack of regular maintenance. This client's case in Rosemont–La Petite-Patrie perfectly illustrates the importance of a complete HVAC system cleaning to preserve its performance, energy efficiency, and durability.
Before our intervention: a heat pump choked by dirt and corrosion
Upon arrival, we found the central heat pump's outdoor unit to be heavily soiled . The heat exchanger fins were covered with a thick layer of black dust , pollen , and atmospheric residue . Traces of rust were visible on the upper metal frame, indicating prolonged exposure to humidity and salt (often present in Montreal air).
The client explained that he had recently noticed:
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A decrease in airflow and less efficient cooling .
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A significant increase in electricity consumption .
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An unusual noise from the outdoor fan , related to the accumulation of dirt.
Step 1: Inspection and preparation for cleaning
We first disconnected the power supply and secured the work area. As the unit was installed in a confined space between two walls , particular care was taken to protect the refrigeration cables and prevent any projection towards the brick walls .
A thorough visual inspection revealed:
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Partially obstructed fins .
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Oxidized fasteners that need tightening.
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Early signs of corrosion on the upper hood.
Step 2: Disassembly and thorough cleaning
We partially dismantled the protective grille to gain full access to the heat exchanger. Then:
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Gentle suction of surface debris and dust.
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Application of a biodegradable and non-corrosive cleaner to all the fins.
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Low-pressure cleaning to remove ingrained dirt without bending the fins.
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Rinse thoroughly with clean water until the metal's shine is restored.
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Cleaning the collection tray and condensation drain , which is often clogged with dust and insects.
Step 3: Mechanical inspection and repair
After complete drying:
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The structural screws have been tightened.
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The rusted parts were treated with an antioxidant product .
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The fan was checked to remove any deposits on the blades.
We then switched the device back on and measured the refrigerant pressure and airflow : the values had returned to normal.
Result: a heat pump that looks like new
After our intervention:
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The operating noise has decreased considerably.
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Energy efficiency has improved (better heat dissipation).
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The customer immediately felt an improvement in interior comfort .
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The visual appearance of the unit, free of rust and dirt, now reflected professional and careful maintenance .
The importance of regularly cleaning outdoor heat pumps
A dirty heat pump can lose up to 30% of its energy efficiency , forcing the compressor to work harder and accelerating wear and tear. In Montreal, where dust, pollen, and weather conditions vary greatly, a thorough cleaning at least once a year is essential.
At AirGreen, we use environmentally friendly products , respect manufacturers' recommendations , and adapt each intervention to the actual conditions of the site : restricted access, proximity to walls, height, type of surface, etc.
Why choose AirGreen for your HVAC system maintenance?
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Local expertise : over ten years of experience in Greater Montreal.
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RBQ certified technicians specializing in HVAC cleaning and maintenance.
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Safe methods that respect your equipment.
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Lasting results : better air quality, increased efficiency, system longevity.
In summary, this intervention in Rosemont–La Petite-Patrie demonstrates that a complete and methodical cleaning of a central heat pump can give an old appliance a second life , while ensuring optimal comfort and energy savings .