An interior head perfectly aligned above the bay window: immediate comfort, silence and ultra-short refrigeration lines
Housing context and objectives
In a typical Villeray–Saint-Michel–Parc-Extension plex, the living room opens onto a large bay window overlooking a rear terrace. The owner was looking for a compact solution to cool in the summer , heat in mid-season , and stabilize humidity without weighing down the aesthetics of the room. We recommend and install a Gree (R-32) wall-mounted heat pump , a new generation with high efficiency , designed for Montreal homes where every centimeter counts.
Why a Gree (R-32) in this configuration
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High air conditioning and heating efficiency thanks to R-32 refrigerant , more thermally efficient and with reduced GWP compared to R-410A.
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Quiet operation : low speed modes suitable for living rooms and movie nights.
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Cold stability : compatible with Montreal winters for reliable heating support down to typical negative temperatures.
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Discreet display on the front indicating the instructions, useful from a distance without disturbing the decoration.
Placement logic: above the woodwork, in line with air circulation
We fix the head at the top , just above the wooden crosspiece and the slatted blinds . This positioning brings several benefits:
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Maximum range : the flow runs along the ceiling then back down into the occupied area, which evens out the temperature in the living room.
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No visual disturbance : the unit aligns with the joinery lines; curtains and blinds remain free.
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Clear maintenance access : front cover and filters accessible without moving the furniture.
Refrigeration path and condensate management
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Very short wall crossing to the outside (wall immediately behind the unit), which limits pressure losses and reduces line length .
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Priority gravity drainage : continuous slope of the condensate pipe to avoid any backflow or odor.
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Clear and discreet exterior capping , connections insulated against condensation and thermal bridges.
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Brazing under nitrogen , deep vacuum and documented leak test before commissioning to guarantee the durability of the circuit.
Installation of the outdoor condenser
In this type of backyard, we favor:
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Wall brackets or an anti-vibration slab near the crossing to keep refrigeration lines short ;
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Regulatory clearances for air intake and maintenance;
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Anti-vibration pads and spacers to prevent any resonance on the brick facade or balcony rail.
Electrical integration and compliance
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Dedicated circuit with rated circuit breaker and disconnect box within easy reach near the condenser.
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Protected cable routing ; watertight bulkheads; verified earthing.
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Respect the distances to woodwork, blinds and combustible elements according to the manufacturer's instructions.
Commissioning: Settings for fine comfort
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Calibrate the probe to match the temperature felt in the center of the living room.
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Orientation of the shutters :
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in air conditioning , tilt slightly above the horizontal to carry the air along the ceiling and avoid direct blowing on the sofa;
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in heating , more closed angle to deposit the heat at human height.
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Airflow : low to medium speed in the evening to maintain silence ; automatic mode during the day to monitor the solar gain from the bay window.
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Gentle dehumidification : maintains a comfortable humidity level without overcooling.
Result obtained
The heat pump quickly stabilizes the room, eliminating the stratification caused by the glass wall. In summer, dehumidification eliminates the heaviness; in spring and fall, the additional heat limits the start-ups of the main system. The noise level remains very low, allowing continuous use, especially at night.
Tips for using the large bay window
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Clear the blowing field : avoid high shelves or decorative covers directly under the unit.
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Leave the blinds open around the mouth to avoid breaking the lamination .
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In hot weather, aim for a set point of 23–24°C: the feeling of comfort comes mainly from the reduction in humidity .
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When heating, favor a gradual increase in order to maintain quiet operation .
HVAC Maintenance: Maintaining Performance
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Every 1–2 months in summer use: clean the filters to maintain airflow.
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Annually : cleaning of the turbine and evaporator , condensate flow test, checking of tightening torques and line insulation.
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Every 2–3 years : complete overhaul including condenser (coil, fan), setting and verification of seasonal performance.
These actions maintain performance and extend the life of the equipment.
Grants and Eligibility
Recent R-32 wall-mounted heat pumps , with high efficiency and capable of operating in extreme cold , are often eligible for programs available in Quebec. We assist our clients in verifying the criteria and preparing the file, throughout Montreal , Laval , Longueuil , as well as on the North Shore and South Shore .
Key technical points of this installation
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Ultra-short refrigeration lines thanks to positioning just above the bay: minimized losses and preserved aesthetics.
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Reliable gravity flow of condensates, tested in long cycles.
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Acoustic management of the condenser by pads and spacers to prevent transmission into the balcony structure.
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Finishes : unit perfectly level, clean capping , stainless steel screws, no visible wires.
Common Mistakes Avoided
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Undersizing in very glazed rooms: we size the capacity taking into account solar gain and actual volume.
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Poorly adjusted shutters generating drafts on the occupants: precise orientation set when put into service.
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Poorly managed condensation : slope and anti-condensation insulation checked; no droplets on the woodwork.
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Exposed wiring or leaky holes: clean , durable finishes that comply with codes.
Why AirGreen
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Local expertise on plexes and condominiums in Greater Montreal: brick facades, narrow balconies, alley access.
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Selection of proven brands (Gree, Sharp, Fujitsu, Midea, etc.) in R-32/R-454B for long-lasting performance.
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Turnkey service : study, careful HVAC installation , instrumented commissioning , HVAC maintenance and support for subsidies . Our priority: stable comfort and controlled consumption , with integration that respects your decor.