A discreet and effective refresh for a Montreal plex
In the heart of the Plateau-Mont-Royal , we are working in a plex with air circulation typical of Montreal housing: narrow corridors, adjoining rooms, openings that open onto small rear balconies. The owner's objective is clear: to efficiently cool the sleeping area and the central corridor without distorting the interior aesthetic. We recommend the installation of a Tosot wall-mounted air conditioner , a compact, quiet and very economical solution, perfectly suited to existing buildings in the Plateau.
The context: a strategic corridor, several doors, little space
The accommodation features a central hall that distributes the bedrooms and the bathroom. In this configuration, the well-directed cold air spreads to several rooms with a single wall-mounted head. We place the unit above a door lintel, respecting the clearance distances to avoid air recirculation and optimize horizontal/vertical sweeping . The high installation frees up space, reduces perceived noise and facilitates maintenance.
Key points of the site:
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Reduced working height under ceiling: precise fixings, suitable anchors.
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Opening to the backyard : short and discreet route for refrigeration connections.
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Close lighting and switches : coordinate with the power supply for a clean finish.
Why Tosot for this project?
Tosot, a GREE Group brand, offers wall-mounted air conditioners with a sleek aesthetic, low energy consumption , and low noise levels —essential criteria for a complex where family life and rest schedules require discretion. The front display allows immediate control of the setpoint (visible here at 65°F), while the ventilation modes and auto-sweep adjust air distribution in the hallway and adjacent rooms.
Relevant advantages in a Plateau accommodation:
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Compactness : can be installed above doors without obstructing traffic.
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Silence : ideal for bedrooms.
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Precise control of temperature and airflow.
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Neat finish : clean cover of the connections on the exterior side, aesthetics preserved on the interior side.
Please note: Grant programs in Quebec primarily target heat pumps (heating + air conditioning). An air conditioner alone is generally not eligible . We recommend comparing with a wall-mounted heat pump , depending on your needs, if winter heating is an issue.
Site preparation: safety, marking, cleanliness
At AirGreen, each HVAC installation follows a rigorous protocol:
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Protect surfaces (floor, moldings, doors) and secure the area using a suitable professional ladder.
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Laser level tracing for perfect alignment with the lintel and compliance with side/top/bottom clearances.
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Installation of the plate : anchors specific to gypsum/wood walls, checked with a dynamometer when required.
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Validation of the passage of connections to the outside: discreet exit point to the courtyard, sheltered from view and bad weather.
Drilling, connections and insulation: performance in the details
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Through-hole with a slight outward slope to promote gravity drainage of condensate, thus avoiding the addition of a lifting pump.
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Minimal clearance around refrigeration tubes (annealed copper) sheathed with closed-cell insulation; nitrogen-brazed joints and calibrated flares where required by the manufacturer's design.
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Communication/power cable in sheath, sealing of the drilling with UV compatible external mastic to prevent air/water infiltration and thermal bridges.
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Exterior capping matching the facade (neutral shade) to conceal the whole and facilitate future maintenance.
This quality of execution preserves the refrigeration load , avoids parasitic condensation and extends the life of the equipment.
Power supply and compliance
The indoor unit is interconnected to the outdoor unit according to the manufacturer's diagram. We check:
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Circuit breaker rating at panel;
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Cable section according to actual length;
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Grounding and polarity ;
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Presence of an external disconnect switch if required by code and configuration.
Every AirGreen installation is documented : serial numbers, line lengths, final vacuum values, and connection photos. This traceability accelerates after-sales service and protects the owner's investment.
Vacuum, charging and functional testing
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Deep vacuum with 2-stage pump and digital vacuum gauge (≤ 300 microns stabilized).
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Leak test and observation of the rise (or lack of rise) of microns.
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Opening of valves , release of factory load and temperature controls : blowing/suction, delta T, pressure stabilization.
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Subjective acoustic measurements in the corridor and rooms to validate perceived quality.
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Calibrate the sweep to direct air to priority rooms.
Result: a uniform airflow in the corridor, rapid cooling of adjacent rooms and a stable setting even in very hot weather.
Result for the customer
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Immediate comfort in the sleeping area and the adjacent bathroom, despite the corridor configuration.
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Very low noise level , compatible with nighttime rest.
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Respected aesthetics : aligned unit, invisible passages on the interior side, sober hood on the courtyard side.
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Simplified maintenance : direct access to filters, quick cleaning without dismantling the plate.
HVAC Use and Maintenance Tips
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Clean filters every 4 to 6 weeks during periods of heavy use.
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Occasional Dry Mode to reduce humidity on muggy Montreal days.
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Realistic setting (23–24°C) to optimize consumption and limit thermal shocks.
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Annual maintenance by AirGreen: inspection of connections, measurement of superheating/subcooling, cleaning of the evaporator and condensate tray, verification of air flow.
Pitfalls to avoid in a Plateau plex
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Position too close to the ceiling without clearance: risk of air recirculation and stratification.
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Drilling in the wrong place : tortuous paths, pressure losses and dripping noise.
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Condensate pump not required : if gravity slope is possible, it remains more reliable and quieter .
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Undersize the appliance : a corridor serves several rooms; additional heating may be required if the doors are constantly closed.
What if winter heating is an issue?
If the owner wants to replace baseboards or improve comfort in mid-season, AirGreen evaluates the benefits of a wall-mounted heat pump (heating + air conditioning) certified for low temperatures. This option opens the door to certain financial aids and considerably reduces the energy bill . Our advisors compare the scenarios (air conditioner only vs. heat pump) according to the reality of the building and the budget.
Our AirGreen promise
Throughout Greater Montreal (Montreal, Laval, Longueuil, North Shore, South Shore) , our teams deliver clean, durable HVAC installations designed for existing buildings. This project in Plateau-Mont-Royal illustrates our approach: precise diagnosis, careful installation, and clear advice to ensure that your Tosot equipment performs at its best for many years to come.