When we were called in for a HVAC service call in LaSalle, we immediately knew the situation would require close attention. A property owner had reported performance issues with their Samsung Smart Inverter wall-mounted heat pump, whose outdoor unit was installed on the rooftop. This type of installation, while common in some urban areas of Montréal and the South Shore, comes with its fair share of challenges, especially concerning stability, insulation, and water infiltration prevention.
Initial inspection: an elevated mounting that raised concerns
Upon arrival, our team performed a visual inspection of the unit. The Samsung wall-mounted heat pump was resting on a wooden base placed on a rigid foam insulation panel, directly on the flat roof membrane. While this setup is often meant to elevate the unit above the roofing surface, it presents several risks:
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Water infiltration: standing rainwater can seep around the panel, eventually damaging the roof’s waterproof membrane.
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Outdoor unit instability: over time, untreated wood supports may rot or shift, especially during the frequent freeze-thaw cycles in LaSalle.
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Poor vibration absorption: improper mechanical isolation can result in abnormal vibrations being transmitted into the interior walls.
We also noted that several cables and pipes running from the compressor were left exposed to UV rays and weather conditions—a major risk for premature wear and tear.
Symptoms reported by the customer
The customer told us they were experiencing a significant drop in heating performance, along with unusual noises coming from the outdoor unit. Specifically:
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Frequent compressor restarts without maintaining a stable temperature.
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A slowing fan, especially in colder weather.
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A low, cyclical humming noise, audible from inside the home.
Technical diagnosis of the Samsung heat pump
After powering off the unit and securing the work area, our certified technicians proceeded with a full technical check-up:
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Outdoor unit mounting check: We found that the front right corner of the base had sunken, causing a slight misalignment.
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Electrical connection inspection: The side junction box showed signs of oxidation inside, caused by slow water infiltration.
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Refrigerant pressure test: We detected a minor pressure loss in the circuit, likely due to a loose fitting affected by vibration.
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Indoor-outdoor communication analysis: No error codes were present, but inconsistent outdoor temperature readings pointed to a failing sensor.
Repairs performed by AirGreen
Based on this diagnosis, our team carried out the following actions:
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Repositioning the outdoor unit: We lifted the unit using a mobile hoist, replaced the wooden base with a galvanized aluminum platform, and added rubber vibration dampers between the base and the unit.
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Electrical box refurbishment: The box was cleaned, all connections were replaced and protected with dielectric gel, and we installed a new IP65 waterproof enclosure.
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Partial refrigerant recharge: We topped up the refrigerant using R-410A, which is compatible with this Samsung model, and verified system tightness afterward.
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Outdoor temperature sensor replacement: We installed a genuine Samsung replacement sensor and recalibrated the system.
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Rerouting the lines: UV protection sleeves were replaced, and the lines were secured with insulated clamps to prevent stress points.
Results and customer feedback
Once powered back on, we immediately noticed a stable and efficient operation from the heat pump, with fast indoor temperature recovery. The compressor ran more quietly, and the heating cycles became smooth and spaced out. The customer, relieved, was impressed with our level of precision and transparency throughout the repair.
AirGreen’s expertise with rooftop HVAC service in LaSalle
At AirGreen, we know every situation is unique—especially when the equipment is installed on a rooftop. The risks related to moisture, vibration, and unprotected installations are too often underestimated. That’s why our interventions always include practical advice to extend the lifespan of the system:
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Use of materials specifically adapted for Montréal’s flat roofs (rubber feet, galvanized bases).
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Enhanced cable protection against UV exposure and harsh weather.
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Level-adjustable supports to absorb seasonal shifts and prevent base misalignment.
Why choose AirGreen for your wall-mounted heat pump repairs in LaSalle?
Our certified technicians for wall-mounted heat pump repairs in Montréal and the South Shore respond quickly with advanced diagnostic tools. Every intervention is documented, and follow-up is offered when needed. We prioritize long-term solutions by combining technical expertise with climate-adapted installation standards for Québec.
