A crucial intervention to revitalize a neglected unit
On the flat roofs of buildings on the South Shore, it's not uncommon to find outdoor heat pump units exposed to the elements, dust, and vegetation. Recently, our AirGreen team was called to Saint-Lambert to perform a complete cleaning of a rooftop heat pump unit whose performance had significantly decreased.
A revealing diagnosis: accumulation of dirt and deterioration of the support
Upon our arrival, we noticed several signs of a lack of maintenance:
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Condenser fins obstructed by dust and debris;
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Traces of corrosion on the metal grid;
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Presence of moss and vegetation under the support structure;
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Deteriorated duct insulation ;
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Wooden support partially weakened by moisture.
These factors compromised not only the appliance's energy efficiency but also its long-term durability . Indeed, a clogged heat exchanger forces the compressor to work harder, increasing electricity consumption and accelerating component wear.
Step 1: Site preparation and safety
Working on a roof requires precision and caution. Before any intervention, our team has:
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Checked the stability of the structure and secured the area;
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Cut off the unit's power supply;
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Prepared a low-pressure cleaning system to avoid damaging the fins.
Step 2: Removing and cleaning the condenser
We began by gently brushing the coil to remove accumulated dust and particles. Then:
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Application of a biodegradable cleaning product specifically designed for HVAC condensers;
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Rinse with clean water at low pressure to remove residue;
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Check the fins to identify bent areas, straighten them using a finned comb.
This process restored optimal airflow through the condenser, which is essential for heat exchange.
Step 3: Clean the area and inspect the connections
Beneath the unit, an accumulation of green moss was retaining moisture, which risked further damaging the support. We have:
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Removed the foam and cleaned the surface using a mild detergent;
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Inspected the refrigeration and electrical pipes , replacing damaged sections of insulation as needed;
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Checked the strength of the support fixings , recommending to the client a future replacement to ensure long-term stability.
Step 4: Performance check and finishing
After complete drying and retensioning, we performed a performance test. Result:
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Stable refrigerant pressure;
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Blowing temperature compliant;
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No abnormal vibrations.
The unit has returned to its optimal performance , and the customer noted a marked improvement in noise level and internal cooling .
The benefits of regular cleaning
An annual maintenance session of this type offers numerous benefits:
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Improved energy efficiency (up to 20% gain);
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Prevention of breakdowns due to compressor overheating;
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Extending the lifespan of the heat pump;
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Cleaner and healthier air for the occupants.
AirGreen's expertise at the service of your HVAC systems
At AirGreen , we emphasize rigorous preventative maintenance and adherence to manufacturers' recommendations. Whether it's for a wall-mounted heat pump, a central system, or a rooftop unit like this one, our approach combines safety, efficiency, and environmental responsibility .
Our team operates in Montreal, Laval, Longueuil, the North Shore and the South Shore , always with the same attention to detail and performance.
AirGreen — Professional HVAC system cleaning in Saint-Lambert and throughout Quebec.
Protect your investment, breathe easier and reduce your energy costs.