Careful exterior installation under a balcony for reliable and quiet performance
At AirGreen , we regularly work in co-ownerships on the South Shore on wall-mounted heat pump installation projects. This project in Brossard illustrates a common configuration: an LG condenser fixed on wall brackets under a balcony, backed by a brick facade, with a dedicated electrical supply and optimized clearances for maintenance. The objective: to offer the client four-season comfort in air conditioning and supplemental heating while respecting the rules of the art in HVAC installation .
Building context and choice of location
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Building type: brick condominium, garden level with adjoining parking spaces.
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Installation area: under the balcony, protected from direct precipitation and midday sun, which reduces summer overheating of the condenser.
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Height and anchoring: the LG outdoor unit is mounted approximately 40–50 cm from the ground on galvanized brackets . This ground clearance limits the risks associated with snow accumulation and facilitates cleaning.
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Vibrations and noise: anti-vibration mounts and tightening to the appropriate torque to preserve the peace and quiet of occupants and neighbors — a crucial point in co-ownership.
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Accessibility: the location frees up pedestrian traffic and allows clear access for maintenance (flushing the exchanger, cleaning the fins, checking the disconnect).
Installed device: LG wall-mounted heat pump (R-32)
When available, we favor the R-32 versions of the LG range for their reduced GWP and high seasonal performance. The chosen solution fits perfectly into a medium-sized apartment/condo:
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Technology: inverter compressor with fine power modulation for quiet and stable operation .
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Nordic service range: efficient operation in summer air conditioning and supplementary heating up to the cold typical of the region; recent LG units meet Energy Star requirements depending on the models chosen.
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Comfort: soft diffusion on the interior side, ideal for open living rooms.
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HVAC maintenance: easy access to filters and exchanger, clear programming to optimize consumption.
Technical note: When the exact series is not communicated by the union or the owner, we size the capacity (e.g. 9,000 to 18,000 BTU ) based on actual losses, insulation level and room configuration. This approach avoids oversizing, which can cause discomfort and short cycles.
Refrigeration and electrical path: short, direct, clean
The architecture of the building and the proximity of the garden-level windows allow for a very short refrigeration path (generally 3 to 5 meters between the indoor head and the condenser). This results in:
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Less pressure loss , therefore slightly higher efficiency.
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Less flow noise and friction points.
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A single hole drilled using a core drill, with a controlled slope for condensate drainage on the inside when gravity is possible.
On the electrical side, the unit has a safety switch (disconnect) installed on the front, within easy reach of technicians. The dedicated circuit, calibrated according to the nominal current of the device, is connected to the main panel in accordance with the requirements of the Canadian Electrical Code .
Condensate management and finishing
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Gravity evacuation preferred whenever the configuration allows (reliability, silence, simplified maintenance).
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Lift pump only considered if natural slope is insufficient - not necessary here.
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Exterior finishes: discreet path along the brick, harmonized UV cladding , heat-resistant sealing and mechanical protection at entry points.
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Clearances: respect the distances from the wall, the floor and the underside of the balcony for good air intake and winter defrosting .
Co-ownership specificities: rules, aesthetics and neighborhood
Intervening in a co-ownership requires coordinating the intervention with the union , the implementation regulations and the aesthetic requirements:
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Template and location validated in advance to avoid air backflow towards neighboring windows.
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Noise pollution management : selection of a respectful working time slot and vibration tests upon commissioning.
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Minimized visual traces : careful cover, routing in the joint axes, post-drilling cleaning.
Commissioning and quality controls
Our technicians apply a rigorous commissioning protocol:
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Nitrogen leak test and pressure maintenance.
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High vacuum < 500 microns with stabilization and residual humidity control.
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Opening of valves and weighing/adjustment of refrigerant if the length of lines requires it according to the LG manual.
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Electrical measurements (intensities, voltages, continuities) and thermodynamic parameters (superheating/subcooling, delta T).
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User configuration : instructions, modes, direction of the airflow on the interior side, explanation of HVAC maintenance routines.
Results observed: comfort, sobriety and tranquility
From the first cycles, the LG heat pump delivers:
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Rapid cooling in summer thanks to the placement of the condenser in partial shade under the balcony.
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An effective supplemental heater in the fall and spring, relieving the burden on electric baseboards and lowering your bill.
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A contained exterior noise level , beneficial for the common courtyard and immediate neighbors.
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Reduced maintenance costs : short journey, clean hood, clearances facilitating seasonal washing.
Current grants and programs
In Greater Montreal ( Montreal, Laval, Longueuil, North Shore, South Shore ), several programs recognize high-efficiency heat pumps . Depending on the LG series selected and its certifications ( Energy Star , performance at −25 °C ), the project may be eligible for available incentives. Our team systematically checks:
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the efficiency class of the device,
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the actual installed capacity ,
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compliance with commissioning (proof of vacuum gauge, serial numbers, technical photos),
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the documents required by the paying body.
Operating Tips for the Owner
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Avoid Auto mode in mid-season: choose Hot or Cold as needed to avoid tipping over.
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Stable setpoint (e.g. 22–23°C in summer) rather than frequent micro-adjustments.
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Filters : Check every 4 to 6 weeks ; clean with warm water, dry completely before replacing.
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Annual maintenance : thorough cleaning of the evaporator, checking of the condenser (fins, fan), inspection of electrical connections and disconnect .
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Winter clearance : Keep the area under the balcony clear of snow and blown gravel to maintain ventilation.
What makes the AirGreen difference
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Rigorous sizing and compliance with good HVAC practices .
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Clean finishes that fit in with the aesthetics of the condominiums.
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Administrative support for subsidies when the device and configuration qualify.
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Structured after-sales service : parts, warranties, inspection visits by appointment.
Express FAQ
Is this installation suitable for a garden level?
Yes, mounting on brackets with ground clearance and the natural protection of the balcony is perfectly suitable, provided that the clearances for air intake and exhaust are respected.
Can I heat my entire condo with the wall-mounted heat pump?
In a well-insulated, moderately sized home, the heat pump covers a large part of the needs. In very cold weather, an electrical backup may still be necessary depending on the configuration.
What about the noise?
Recent LG inverter modulator units are very quiet. The use of anti-vibration mounts and speed adjustment limit the noise perceived both outside and inside.
In summary
This LG wall-mounted heat pump installation in Brossard combines efficiency , silence and durability thanks to a short cooling path , anchoring on brackets under the balcony and certified commissioning . It is a reference configuration for many condominiums in Greater Montreal wishing to gain in comfort while controlling their consumption.
Contact us for a 100% free on-site estimate and precise sizing according to your accommodation in Montreal, Laval, Longueuil, North Shore, South Shore .