Necessary maintenance for a dirty outdoor unit
Recently, our AirGreen team went to Sainte-Julie , on the South Shore of Montreal, to perform a complete cleaning of an outdoor wall-mounted heat pump installed on an apartment balcony.
The customer had noticed that their heat pump was becoming noisy and seemed less efficient at heating their home, especially on cold mornings. A quick visual inspection confirmed our suspicions: dust and debris had accumulated on the fins and filters , restricting airflow and increasing the compressor's workload.
Initial state: accumulation of dirt and restricted air circulation
During our inspection, we observed:
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A grey layer of compacted dust on the top and side grilles of the unit;
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Clogged heat exchanger fins , preventing proper heat exchange;
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Traces of plant debris and urban pollution;
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A confined environment (closed balcony and metal barrier) reducing natural ventilation.
These combined conditions create compressor overheating , a loss of energy efficiency , and in the long term, a risk of premature component failure .
The steps of AirGreen professional cleaning
1. Preparation and securing of the intervention
Before any handling, we cut off the power supply and protected the walls and surrounding surfaces . An absorbent tarp was placed under the unit to collect water and impurities.
2. Mechanical disassembly and cleaning
We removed the top cover and cleaned it:
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Clean the fins using a soft anti-static brush ;
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The fan blades, covered in fine dust;
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The outline of the base of the unit where wet and blackened particles had accumulated.
A HEPA vacuum cleaner was then used to remove dirt thoroughly without damaging the components.
3. Application of an environmentally friendly detergent
We sprayed a biodegradable cleaning product formulated for HVAC equipment. This treatment dissolved grease deposits and ingrained dust. After a few minutes, a low-pressure rinse with warm water removed all impurities without damaging the fins.
4. Drain and wiring check
A check of the condensation drain pipe confirmed free flow. We also checked the electrical connections and the control panel , which are often exposed to moisture and dust residue.
5. Drying and performance testing
Once the cleaning was complete, the unit was dried with compressed air before being powered back on. We then measured:
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The blowing temperature ;
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Airflow ;
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The noise level .
All parameters have returned to normal: the heat pump has regained its efficiency and is operating quietly.
Results obtained
The owner immediately noticed:
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A noticeable reduction in noise ;
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Shorter heating time in the main rooms;
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A better smell of indoor air , fresher and without any trace of humidity.
Thanks to this cleaning, the heat pump is now ready for several seasons of optimal performance. This type of regular maintenance not only prevents breakdowns but also helps reduce energy consumption by up to 20%.
The importance of regular HVAC maintenance
An HVAC system naturally accumulates dust, pollen, and micro-debris. Without annual maintenance:
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The filters become saturated and reduce performance;
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The compressor works harder, increasing energy costs;
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Indoor air becomes more laden with harmful particles.
That is why at AirGreen , we recommend a complete cleaning at least once a year , ideally in spring or autumn , before the seasons of heavy use.
AirGreen: expertise, rigor and respect for manufacturers
Our certified technicians operate throughout the Greater Montreal area, including Laval , Longueuil , the North Shore and the South Shore .
We use only non-corrosive products , compliant with manufacturers' standards , to ensure safe and effective cleaning, regardless of the model or brand of your wall-mounted heat pump.
Is your heat pump showing signs of fouling or decreased performance?
Trust AirGreen , your HVAC cleaning and maintenance specialist in Montreal and the surrounding area. A clean system means healthier air and daily energy savings.