Installation of a Lennox (wall-mounted range) wall-mounted heat pump in Plateau-Mont-Royal
AirGreen installed a Lennox wall-mounted heat pump in a Plateau-Mont-Royal plex: neat balcony installation, sleek lines, and quiet performance. Expert service in Montreal, Laval, Longueuil, North Shore, and South Shore.
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The article, chapter by chapter
Four-season comfort in a brick plex: a careful integration by AirGreen
At AirGreen , we have just completed the HVAC installation of a Lennox wall-mounted heat pump in an apartment in Plateau-Mont-Royal . The context: a typical brick plex, metal balcony, limited side access and air circulation to manage between the party wall and railing. Our mission: to provide stable and quiet heating/cooling, without compromising the aesthetics of the building or the durability of the equipment.
Result: performance, silence and respect for clearances on a narrow balcony
We deliver a discreet HVAC system, well protected against frost and splashes, with optimized air diffusion on the interior side. The Lennox outdoor unit is installed on anti-vibration pads, with covered and sealed refrigeration lines, and a secure power supply in accordance with current standards. The assembly integrates naturally into the building, ready for Montreal winters as well as the summer heat.
Site analysis and choice of location
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Built context : brick facade, narrow balcony with railing; immediate neighborhood and nearby windows.
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Objectives : minimize vibration transfer to the slab, preserve the clearances required for suction/discharge, and protect the passage of pipes through the masonry.
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Chosen layout : outdoor unit on the ground on a balcony, raised by anti-vibration pads for water drainage and reduction of vibration transmission. Positioned parallel to the wall to maintain a free area in front of the grille and a sufficient air corridor between the machine and the guardrail.
Drilling and passing lines
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Brick wall penetration : PVC sleeve slightly inclined outwards for natural drainage; vapor barrier and butyl sealant ensuring watertightness.
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Refrigeration lines : high-density insulated copper, bend radius respected, rigid light-colored capping for a clean finish and UV protection.
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Condensate management : gravity slope, service siphon on the interior side, discreet outlet on the facade.
Power supply and protections
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Dedicated power supply from panel; circuit breaker meets manufacturer's requirements.
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Accessible outdoor disconnect box , weatherproof sheathed wiring, mechanical fixing on rigid support.
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Grounding checked and tightening checked to the prescribed torque .
Acoustic and vibration control
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Anti-vibration pads under each condenser pad to filter low frequencies.
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Sufficient spacing between rigid walls to limit sound reflections.
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Checking the propeller and fairing to eliminate any risk of resonance with the guardrail.
Performance and sizing
We size each wall-mounted heat pump based on a room-by-room load calculation (envelope, orientation, infiltration, internal contributions). In a Plateau home, the target capacity is generally in the 12,000–18,000 BTU range, depending on the usable surface area and the openness of the plan. The Lennox selection chosen offers:
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Inverter modulation to closely monitor actual demand and limit short cycles.
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Reliable heating in cold weather, with optimized defrost strategies.
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High seasonal efficiencies (SEER/HSPF), guaranteeing year-round savings.
Salient Installation Details (What Makes the AirGreen Difference)
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Compact routing : direct penetration behind the indoor unit, reduced connection length to minimize losses and facilitate subsequent service.
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Capped finish : capping aligned and cut cleanly at angle changes; stainless steel screws for durability.
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Water management : raised by pads to prevent the accumulation of meltwater and make it easier to sweep the balcony.
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Easier future maintenance : clearances provided for fan/exchanger access, accessible service valve, clear Schrader valve .
Preparing for Montreal winters
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Checking snow clearances and the risk of snow accumulation on the balcony; sufficient height for defrosting and evacuation.
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Direction of the discharge to avoid hot air being discharged towards the adjacent window and limit recirculation.
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End-of-site checks: nitrogen test , deep vacuum test (≤ 500 microns), leak test and refrigerant charge according to the actual length of the lines.
Aesthetics and durability on masonry
Plateau brick requires special attention:
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Suitable anchors (anchors for masonry) and interposition of neoprene washers to prevent chipping.
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Hybrid seals resistant to freeze-thaw cycles and UV rays.
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Compact conduit passage, painted as needed to blend in with the facade.
Interior: air diffusion and comfort
On the interior side, the wall-mounted head is placed on a clear wall, at an optimized height for sweeping air into the living area. The oriented fins reduce stratification in winter and improve summer comfort. We configure:
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Auto speed with stable setpoint to maximize modulation.
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Exchanger drying function after air conditioning to limit odors and microbial growth.
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Automatic restart after power cut, useful in urban areas.
Grants and Compliance
Depending on the Lennox series chosen and its certified performance , the installation may be eligible for programs in effect in Quebec. We support our customers in the process, particularly for Montreal, Laval, Longueuil, North Shore and South Shore , and we provide the necessary documents (technical sheet, proof of installation, certification numbers).
Each project is carried out in compliance with RBQ standards and manufacturers' requirements, which preserves the equipment warranty .
Instructions for use and maintenance (to maintain original performance)
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Clean the indoor unit filters every 4–8 weeks depending on usage.
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Maintain minimal clearance around the condenser and clear snow in winter.
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Schedule an annual maintenance visit : electrical check, pressures, exchanger, drain, parameter update.
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Avoid temporary obstructions (bins, bicycles, fabrics) in front of the condenser suction grille.
Pitfalls to avoid on an urban balcony
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Place the unit directly on the slab without pads: increased vibration transmission and water stagnation.
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Attach the condenser to the wall or guardrail: air recirculation and reduced capacity.
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Drilling the brick without a sleeve or slope: risks of infiltration and deterioration of the air barrier.
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Forgetting the accessible disconnect box : non-compliance and complicated service.
Why AirGreen for your project in the Plateau and throughout Greater Montreal?
We master the constraints of brick buildings, narrow streets, and limited balconies. Our team:
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Size your needs precisely (room by room).
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Offers the right solution (mono or MultiZone , wall/slab/roof support options).
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Installs cleanly with a durable finish and special attention to acoustics.
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Support for long-term HVAC grants and maintenance .
We operate daily in Montreal, Laval, Longueuil, the North Shore, and the South Shore . Whether you're looking for an apartment in the Plateau, a house in Verdun, a condo in Brossard, or a triplex in Chomedey, we apply the same rigor and high standards.
Balance sheet
The installation of a Lennox wall-mounted heat pump in Plateau-Mont-Royal delivers exactly what the client was looking for: comfort , silence , and energy efficiency . The outdoor unit fits discreetly into the balcony, the connections are protected and waterproof, and the indoor head ensures even distribution. It's a sustainable solution, designed for everyday Montreal life.
The job tools
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
How the job unfolds
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What we check on a job like this one
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
The right pages, at the right time
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).