Four-season comfort in a modernized Rosemont plex: precise intervention at height, near the ceiling and a partition return, for regular, discreet and energy-efficient air diffusion in the living area.
The context: a high-rise installation in a renovated plex
For a homeowner in Rosemont–La Petite-Patrie , the upper floor was renovated with straight partitions, a dropped ceiling , and a narrow passageway to the bedrooms. The goal: to install a compact wall-mounted heat pump near the ceiling to free up wall space, avoid clutter in the hallway, and support shoulder-season heating while ensuring stable air conditioning in the summer.
We are choosing a Midea wall-mounted heat pump, Midea28 range (R-454B) , known for its very good inverter modulation, its low noise level and its operating range adapted to the climate of Greater Montreal . The R-454B series meets current expectations in terms of the climatic footprint of the refrigerant.
Why the Midea28 range (R-454B) in this type of building
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High efficiency at partial load thanks to the inverter compressor;
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R-454B fluid with reduced GWP compared to previous generations;
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Compact indoor unit, ideal for installation high under ceilings;
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Efficient defrosting electronics and maintenance of useful capacity at low temperatures;
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Low noise levels, suitable for a narrow hallway and adjacent living room.
For an open-plan Montreal plex, we generally size between 9,000 and 12,000 BTUs , taking into account orientation, insulation and internal inputs from the kitchen.
Actual site constraints
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Reduced height between the top of the unit and the ceiling, with a wall angle forming a small return.
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Narrow passage : air diffusion must not create a cold/hot air corridor towards the rooms.
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Aesthetics : no visible chute desired inside; priority given to a clean finish after finishing work.
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Short route required to maintain performance and limit visual impact on the exterior.
Our HVAC installation methodology
1) Positioning and clearances
The Midea wall-mounted fan is mounted on a perfectly level mounting plate . Despite its proximity to the ceiling, we adhere to the manufacturer's recommended front and top clearances to prevent recirculation. We set the fan to sweep the living room, not directly into the hallway.
2) Drilling and routing of connections
Behind the unit, we make a single drilling with a controlled slope towards the outside. The pre-insulated refrigeration lines , the communication cable and the condensate drain pass through it together. The external route is short (approximately 3 to 5 m ), guaranteeing excellent thermodynamic behavior. Inside, everything is invisible : no visible trunking, finishes redone as needed for a clean wall.
Outside, the connections are protected by a UV-resistant technical cover , matching the facade. The condenser is installed with standard clearances for airflow and service access.
3) Evacuation of condensates: priority to gravity
The installation height allows for gravity drainage . We create a continuous slope, add a discreet service point and, if necessary, an anti-odor siphon . This approach avoids the use of a pump, reduces noise, maintenance and the risk of breakdown.
4) Power supply and compliance
The device is powered by a dedicated circuit compliant with the Canadian Electrical Code , with a suitable circuit breaker . The conductors are channeled and labeled for future work. A polarity and continuity test is performed before powering up.
5) Leakage checks and commissioning
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Nitrogen test of the refrigeration network;
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Deep vacuum draw (holding control);
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Setting up the remote control and calibrating the probes ;
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Operational measurements: delta-T supply/return, intensity, pressure and simulated defrost behavior.
Result: stable diffusion and preserved aesthetics
The horizontal blowing serves the living room without creating a draft in the passage. Thanks to the inverter modulation, the temperature remains uniform and the noise level is very contained. Visually, the high installation frees up the wall and blends in with the finishes of the accommodation. Filter access remains easy for HVAC maintenance .
Sizing and benchmarks for Rosemont–La Petite-Patrie
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9,000 BTU : small open living rooms, recent insulation, north/east exposure.
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12,000 BTU : medium-sized living rooms with open kitchen, south/west exposure.
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18,000 BTU : large longitudinal floors or double living room.
These benchmarks are refined with insulation , windows , ceiling height , solar gains and uses (cooking, teleworking, occupation).
Good practices for daily use
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Maintain a stable setpoint ; avoid sudden variations.
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In summer, shutters are slightly upward-facing for gentle stratification; in mid-season, horizontal blowing to sweep the living area.
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Leave the doors ajar to encourage air circulation.
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Filters : clean every 4 to 8 weeks depending on urban dust.
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Clear the outdoor condenser (snow, vegetation) and maintain airflow.
HVAC Maintenance: AirGreen Protocol
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Disassembly and cleaning of filters and internal exchanger;
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Checking the gravity drain and rinsing the service point;
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Inspection of external connections , hood and supports ;
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Operating readings (temperatures, intensity, noise) to anticipate any deviation.
Annual maintenance maintains seasonal performance and the longevity of the installation.
Grants and eligibility in Greater Montreal
High-efficiency wall-mounted heat pumps using new-generation refrigerants such as R-454B may be eligible for assistance programs . Eligibility depends on the model , certified performance , and low-temperature heating range . We support our clients in Montreal , Laval , Longueuil , the North Shore , and the South Shore to build a complete file and optimize the amounts.
Technical points to remember for installation very close to the ceiling
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Respect for upper and lateral clearances ;
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Precise adjustment of the fins to avoid recirculation against the ceiling;
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Short connection distances = responsiveness and better efficiency;
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Gravity drain as soon as the height allows;
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No visible interior chute: clean finishes and easy maintenance.
Why entrust this type of project to AirGreen?
We work daily in plexes and condos in Rosemont–La Petite-Patrie and Greater Montreal . Our approach combines custom sizing , careful HVAC installation , HVAC maintenance advice, and grant support. Every detail counts: location, drain slope, connection insulation, blower settings, and ease of access for years to come.
Internal keywords : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .