Discreet four-season comfort in a Montreal triplex: performance, silence and careful finishing in a renovated living space
Context: a typical Rosemont home, modern expectations
In a triplex in Rosemont–La Petite-Patrie , our clients renovated the open-plan living room-kitchen area and wanted to add energy-efficient supplemental heating and precise air conditioning for the summer. The priorities: silence , minimal aesthetics , controlled consumption and respect for the constraints of a Montreal plex (party walls, limited openings, short and clean routes). We propose the installation of aTOSOT wall-mounted heat pump , a reliable, efficient solution particularly suited to rooms with prolonged use.
Installation Overview
Retained equipment
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Type : wall-mounted heat pump (mini-split).
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Brand : TOSOT .
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Configuration : an indoor head for the living room + dedicated outdoor condenser.
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Power range : sizing targeting 12 to 18 kBTU depending on the actual thermal load; commissioning with fine tuning of the inverter to optimize low mid-season loads.
Interior layout
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Positioned high up , close to the ceiling to promote controlled air stratification and uniform diffusion towards the kitchen and corridor.
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Clearances respected above and laterally so as not to restrict suction and recovery.
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Discreet display on the front showing the setpoint at 24°C during testing, smooth visibility without light disturbance in the evening.
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Motorized shutters set to blow horizontally in winter to limit the sensation of drafts and slightly oblique in summer to break the heat accumulated under the ceiling.
Route and finishes
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Drilling through the exterior wall with outward slope for reliable gravity drain in air conditioning mode.
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Insulated refrigerant connections with extreme cold sheath; white capping aligned along the wall up to the exit point, in line with the moldings for clean visual integration .
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Total apparent length (inside + outside) estimated at 4–6 m , which maintains low pressure loss and high cooling efficiency .
Why TOSOT in a Rosemont plex
Performance in Montreal climate
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Inverter technology that continuously adjusts the compressor power according to actual demand: reduced consumption , stable temperature and silence at partial load.
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Designed to accommodate rapid temperature variations between Montreal seasons; noticeable responsiveness to restore comfort after frequently opening the patio door.
Acoustic comfort
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Low indoor noise level : ideal for living room and home office.
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Automatic speed that decreases as soon as the setpoint is reached, limiting noise peaks and short cycles.
Aesthetics and ergonomics
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Clean front line : the smooth facade and the moderate intensity display respect the minimalist interior architecture of the renovation.
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Simple remote control with seasonal modes and timers; typical setpoints 21–22°C for heating and 23–24°C for cooling are recommended to balance comfort and costs.
Key steps in our HVAC installation
1) Preliminary study and sizing
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Survey of surfaces, orientation , windows and insulation .
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Analysis of internal sources of gain (kitchen appliances, lighting).
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Choosing the unit size to cover the majority of the load without oversizing, a determining criterion for the durability of the compressor.
2) Drilling and protection of the frame
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Drilling on a controlled slope ; installation of a sleeve to prevent abrasion of the insulation.
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Interior/exterior caulking : vapor barrier and elastomeric mastic to guarantee airtightness , essential in plexes subject to prevailing winds.
3) Installation of connections and drain
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Bending radii respected to preserve the integrity of the copper.
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Independent gravity drain , tested with clear water; weatherstripping on the exposed portion to prevent parasitic condensation on cold walls.
4) Electrical connection
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Dedicated circuit from the panel, size adapted to the nameplate; external disconnect near the condenser in accordance with the Quebec Electrical Code .
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Grounding and controlled tightening of all terminal blocks.
5) Vacuum packaging and controls
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Deep vacuum up to the recommended threshold; vacuum holding checked before fluid release.
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Heating and then air conditioning tests: stability of superheating/subcooling , defrost operation, response of the indoor fan.
6) Finishing and delivery
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Aligned capping , stainless steel screws, UV collars on the outside.
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User brief provided: filter changes, setpoint ranges, seasonal maintenance, best practices in co-ownership.
Specific challenges and solutions adopted
Minimize visual impact in an open space
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Choice of a short, straight line , capping matching the wall painting.
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Device positioned so as to blow parallel to the ceiling, avoiding turbulence in the dining area.
Summer Humidity Management
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Setting to prioritize low-speed dehumidification during humid episodes.
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Gravity drainage sized and tested; slope validated to prevent any backflow towards the inner hull.
Montreal winter and defrosting
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Instructions for using the appliance to automatically carry out its defrost cycles.
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Adequate elevation and clearance provided on the exterior side (see next section) to prevent ice accumulation .
Outdoor installation (condenser)
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Stable support (wall brackets or mini-platform depending on the facade), anti-vibration pads .
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Clearance > 30 cm for snow; clear front face .
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Route the lines under capping to the piercing point; gentle radii for the final curvature.
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Disconnection box and circuit identification on the panel; labeling compliant for any future intervention .
Results: tangible comfort and controlled bill
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Uniform temperature in the open area despite afternoon solar heat.
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Very low noise , compatible with teleworking and movie nights.
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Optimized consumption thanks to the inverter; customers maintain stable setpoints rather than frequent variations, which reduces power demands.
HVAC usage and maintenance tips
Recommended settings
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Winter : automatic ventilation, setpoint 21–22°C , horizontal shutter to circulate the air without cold current.
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Summer : setpoint 23–24°C , shutter slightly upwards; use the timer function to anticipate before returning home.
Preventive maintenance
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Filters : clean every 4–6 weeks during periods of intensive use (kitchen dust, pollen).
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Annual AirGreen inspection : pressures, connections, cleanliness of the exchanger, drain test, check of silent blocks and disconnect .
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Clearance around the condenser to be maintained in all seasons (vegetation, snow, objects).
Grants and support
High-efficiency wall-mounted heat pumps may be eligible for certain provincial programs depending on the model's performance and certification. We guide our clients in Montreal, Laval, Longueuil, the North Shore and the South Shore in verifying criteria , documenting and optimizing their home's energy strategy .
Why entrust your project to AirGreen?
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Montreal plex and condo specialists : short journeys, clean finishes, careful waterproofing and acoustics .
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Complete support : advice, sizing, HVAC installation , HVAC maintenance , after-sales follow-up.
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Selection of proven brands : TOSOT, Sharp, Gree, Fujitsu, Midea and more, with discreet and lasting integration into each local context.
Frequently Asked Questions
Can you heat all season with a wall-mounted heat pump?
In a well-insulated home, a high-performance wall heater covers most of the needs. A supplement can be useful during peaks of extreme cold .
Is a lift pump necessary?
Not here: the gravity drain works, guaranteed by the sloping drilling . When the interior head is far from a facade or in the basement, we offer a silent and maintenance-friendly condensate pump .
Does the display stay on at night?
The display intensity remains soft ; we can configure brightness settings on certain models, according to the occupants' preference.
Are you considering a wall-mounted heat pump for an apartment or plex in Montreal , Laval , Longueuil , on the North Shore or the South Shore ? We evaluate your room, precisely size the equipment and deliver a clean installation , ready for four-season comfort.
Keywords : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , TOSOT , Rosemont–La Petite-Patrie .