Precise comfort in an interior with Montreal character, without compromising on aesthetics or efficiency
At AirGreen , we assist Montreal homeowners with custom HVAC installation projects. In this Rosemont–La Petite-Patrie home , our mission is to provide four-season air conditioning with a Haier wall-mounted heat pump , neatly integrated into a circulation room with two interior doors and a wood-slatted ceiling. The challenge: preserve the clean lines of the wall while optimizing air diffusion and accessibility for maintenance.
Housing context and comfort needs
A typical living space in Montreal plexes, the hallway serves several rooms and receives variable heat gain depending on the sunlight. The owners wish to:
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Stable heating during the off-season and during very cold weather, in addition to their existing emitters;
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Powerful and discreet cooling for summer;
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A quiet device, with gentle air diffusion so as not to hinder traffic at the doors.
After a technical visit and a summary load calculation, we selected a range of 9,000 to 12,000 BTU/h . The final choice was a Haier inverter wall-mounted head (residential range) rated at 12,000 BTU/h , capable of ensuring comfort in the main area and radiating to adjacent rooms.
Choosing the location of the inner head
We place the head in the upper part , centered above the passage, in order to:
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Maximize the blower range along the corridor to push air into adjacent rooms;
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Avoid interference with the openings (two doors) and clear the wall plane;
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Reduce the risk of suctioning obstacles and facilitate access to pre-filtration .
The orientation of the shutters is set for a wide horizontal sweep and a vertical angle which promotes stratification in heating mode (hot air falling without creating a draft in the passage area).
Refrigeration and drilling path: clean, short and reversible
The structure shows a paneled ceiling with an available plenum. We opted for a through-hole behind the anchor plate, then a ceiling path to reach the nearest exterior facade. Advantages:
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Reduced connection length (≈ 6 to 8 m in total), limiting load losses and improving seasonal efficiency;
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Maximum discretion on the interior side (no visible capping in the living area);
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Easy reversibility in case of redevelopment.
The copper connections are insulated with high-density cellular (code-compliant thickness), taped, and protected. The exterior exit point is covered with a UV-coated finish for a long-lasting appearance.
Condensate management: gravity impossible, discreet pump
Installation on an interior partition does not allow for sufficient gravity slope to be created to the outside. We therefore integrate a compact condensate pump placed in a basin under a cover, with:
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Silent block and anti-vibration path to eliminate any parasitic noise;
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Level detector and anti-overflow safety device shutting down the device in the event of a fault;
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Discharge connected to a dedicated drain, with siphon and backflow preventer .
This choice guarantees reliable dehumidification operation in summer, without visual impact.
Outdoor unit: neat urban layout
Outside, the unit is placed on anti-vibration brackets at clear height:
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Clearances in accordance with manufacturer's recommendations for air intake and discharge;
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Passage of the connections in a discreet vertical then horizontal white capping ;
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Winter management: sufficient elevation and area cleared of snow to avoid powder suction and maintain de-icing performance.
Power supply and protections
We draw a dedicated 240V circuit from the panel, with:
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Circuit breaker suitable for nameplate;
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External circuit breaker box (disconnect) accessible near the unit;
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Grounding measured and full compliance with the Code .
This approach ensures safety and simplifies maintenance.
Rigorous commissioning: performance and reliability
Our technicians apply the steps that make the difference:
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Nitrogen test (≈ 300 psi) to validate the tightness of solders and fittings;
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Deep vacuum draw down to ≤ 500 microns , then stabilization to check for the absence of residual moisture;
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Load compensation if length exceeds factory pre-loaded amount;
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Setting of shutters and heating/air conditioning curves according to the corridor configuration;
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Functional checks (intensities, overheating/subcooling, noise).
Result: a responsive, quiet heat pump , and an optimized COP at partial loads.
Aesthetics and integration into an interior with a wooded feel
The appliance blends in with the wooden slatted ceiling and painted door frames. The Haier head, with its rounded lines, remains visually light . The finishes (invisible anchors, clean joints, local touch-up paint) ensure seamless integration .
What the customer gains on a daily basis
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Efficient heating even in moderate cold, reducing the use of energy-consuming emitters;
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Targeted cooling in the corridor axis, limiting summer thermal overloads;
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Improved air quality thanks to the washable pre-filter and internal drying functions after air conditioning;
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Low noise level , ideal for circulation areas and adjoining rooms.
Best practices and pitfalls to avoid in Montreal plexes
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Always anticipate the evacuation of condensates : on an interior partition, a well-placed pump is better than a forced gravity pump with random slopes.
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Maintain clearances around doors : installing too low creates recirculation and cold spots .
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Protect the outdoor unit in winter: raised, free air circulation and preserved de-icing .
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Limit refrigeration lengths : each extra meter costs in terms of efficiency and complicates charging.
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Plan the power supply : a dedicated 240 V circuit prevents nuisance tripping and complies with the Code.
Maintenance recommended by AirGreen
To maintain high performance:
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Clean the filters every 4 to 8 weeks during use;
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Annual inspection: tightening , micron check of the vacuum pump during an intervention, in-depth cleaning of the evaporator and the fan;
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Condensate pump check (level and safety test);
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Exterior inspection: fins, supports, snow clearance .
Our HVAC maintenance contracts cover these points and extend the life of the installation.
Grants and Eligibility
High-efficiency wall-mounted heat pumps like those from Haier are generally eligible for local assistance when seasonal efficiency criteria are met. We support our customers in Montreal, Laval, Longueuil, the North Shore, and the South Shore to verify eligibility and prepare applications to reduce the net installation cost .
Conclusion: a clean, efficient and scalable installation
This wall-mounted heat pump installation meets the spatial constraints of plexes while delivering energy-efficient comfort. The careful location, intelligent condensate management , compliant electrical installation and methodical commissioning ensure a reliable and efficient system, ready to face the island's winters and Montreal's summers.
Why AirGreen
We combine technical expertise , attention to detail, and a mastery of the architectural realities of Greater Montreal. Our team advises, installs, and monitors your wall-mounted air conditioner/heat pump with a clear commitment: a clean site, consistent performance, and available after-sales service.