Installation of an LG (Dual Inverter range) wall-mounted heat pump in Le Plateau–Mont-Royal

An elevated location for immediate comfort in an open Montreal area

At AirGreen , we adapt each HVAC installation to the architecture of the Plateau's plexes and condos. Here, the LG wall-mounted heat pump ( Dual Inverter range) is positioned high up , above the vestibule and at the entrance to an open area that includes the living room, kitchen and dining area. This configuration allows for long-range air diffusion to the entire floor while freeing up useful walls for furnishings.

The room has a sloping ceiling with drop, track lighting and a large side window: all elements that influence air circulation. By placing the unit at the most unobstructed point , we obtain a uniform sweep without hot recirculation under the ceiling in winter or cold zones near the windows in summer. The aesthetic remains sober: the interior head integrates into the white frame of the wall, without visible hood or visible channel in the room.

What the LG heat pump brings to a Plateau plex

LG's Dual Inverter technology allows the compressor to finely modulate its speed. In concrete terms, this means:

• Stable temperature without jolts, pleasant for both sleeping and teleworking.

• Energy savings thanks to modulation that avoids on/off cycles.

• Low noise level from indoor and outdoor units, an advantage in adjoining buildings.

• Useful everyday comfort functions : automatic restart, precise shutter control, frost protection, daily programming.

Depending on the surface area and insulation, we generally recommend a power output between 9,000 and 15,000 BTUs for a typical open-plan apartment building. Here, the challenge was to cover a high-ceilinged volume while still allowing space for the lighting strip and the roof overhang.

Our sizing methodology

Before any installation, we take measurements and perform a simplified thermal assessment : surface area, free height, orientation of the windows, air infiltration, use of the room. Based on this, we choose the appropriate BTU power and blowing curve . On LG units, the angle of the louvers and the fan speed provide sufficient adjustment margin to project air towards the kitchen and living room areas without creating a draft near the vestibule.

Technical details and installation steps

1) Positioning of the inner head

• Installation height above the drop : the air is propelled under the ridge then descends naturally, avoiding stratification.

• Side clearances respected for maintenance (opening the hood, cleaning the filters).

• Alignment with the lighting rail to limit shadows and avoid any visual disturbance.

2) Drilling and refrigeration route

• Precision coring with controlled slope for gravity drainage of condensates in air conditioning mode.

• Short, straight route behind the partition to limit pressure losses, with continuous insulation on the copper connections.

• Waterproofing of the through-hole on the exterior side and moisture barrier at the masonry level.

3) Condensate management

• Gravity drain to the outside, protected against frost and away from traffic. This approach eliminates the need for a condensate pump—less noise, less maintenance.

4) Power supply

• Dedicated circuit, circuit breaker calibrated according to the nominal current of the unit; external disconnection near the condenser for safe interventions.

• Grounding and mechanical routing in accordance with the Canadian Electrical Code and manufacturer's requirements.

5) Commissioning and checks

• Brazing under nitrogen , leak test, deep vacuum drawing to the required threshold.

• Checks on supply/return temperature , intensity, pressure and communication between electronic cards.

• Initial setting of the shutters for a jet of air directed towards the living area, then demonstration of the functions to the occupant.

Architectural integration: making height an advantage

Sloped ceilings can trap warm air; by placing the head at the top and directing the long horizontal flow, we create a natural convection loop . In winter, the heated air gently descends towards the vestibule and kitchen area; in summer, low to medium speed is enough to break up the pockets of warm air under the ceiling without feeling a draft. The presence of a guardrail on the kitchen side also guides the air circulation towards occupied areas.

Results observed after installation

• Temperature uniformity throughout the open area, even during rapid weather changes.

• Reduced ambient noise compared to an old portable air conditioner; conversation under the spotlight rail remains natural.

• Controlled consumption : continuous modulation and short refrigeration path optimize seasonal efficiency.

• Simplified HVAC maintenance : easily accessible filters; the outdoor unit, installed in the optimal location on the courtyard side, offers clear access for washing the exchanger.

Maintenance recommended by AirGreen

To maintain the performance of your wall-mounted heat pump :

1. Clean filters every 4–8 weeks during periods of heavy use.

2. Clear the outdoor unit of leaves, dust and snow; check the clearance in front of the fan.

3. Check the slope of the drain in the spring and make sure that the outlet is not blocked.

4. Schedule an annual inspection : electrical readings, temperatures, condition of insulation and washing of coils if necessary.

5. Adjust time programming and seasonal settings to limit power demands.

Grants and Eligibility

Several programs in Quebec and at the federal level support the installation of high-efficiency heat pumps . Eligibility depends on the seasonal performance (SEER/HSPF/SCOP) of the LG model chosen, the quality of the installation and the installation location . We support our customers in the Plateau, Montreal , Laval , Longueuil , North Shore and South Shore for:

• check the conformity of the selected model;

• prepare photographic evidence and detailed invoices;

• optimize the project (power, location, configuration) in order to meet the required performance criteria.

AirGreen Tips for High-Rise and Open-Plan Rooms

• Favor useful height : place your head high enough to avoid obstacles and extend the range of the jet.

• Take care with the angle of the shutters : a horizontal sweep limits stratification under the ceiling.

• Reduce lengths : a short refrigeration route improves efficiency and reduces the risk of breakdown.

• Think about noise : the LG heat pump is discreet, but the choice of outdoor location remains decisive (keep bedrooms and neighbors away).

• Provide access : filters and cover must be able to be opened without dismantling the light fixture or furniture.

Conclusion

This LG wall-mounted heat pump installation in the Plateau-Mont-Royal demonstrates how elevated positioning and an optimized technical path transform the comfort of an open-plan Montreal space. With Dual Inverter modulation, reliable gravity drainage, and rigorous commissioning, the system delivers efficient winter heating and summer cooling , while preserving the room's aesthetics. Our teams operate with the same high standards in Montreal, Laval, Longueuil, and on the North and South Shores for durable and efficient HVAC installations .