A discreet addition that changes everything: a well-positioned wall head, a clean, gravity-driven connection path, and controlled comfort room by room — that's the spirit of this HVAC installation by AirGreen in the heart of Rosemont–La Petite-Patrie .
Why this project is exemplary
In this typically Montreal brick plex, our client was looking for a quiet, economical, and elegant system to efficiently cool and heat the main living area without major renovations. We recommended a Zephyr wall-mounted heat pump for its excellent comfort/energy ratio, proven reliability, and discreet design that blends in with Montreal's interiors featuring moldings and woodwork.
Housing context and performance objectives
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Building : Montreal plex with rear balconies and metal stairs; standard floor height, modern sash windows.
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Target room : living/dining room adjoining a double window facing the courtyard.
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Needs : quickly cool down on summer afternoons, provide additional heating in spring/autumn, reduce annual energy bills.
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Constraints : avoid visible gutters in the middle of walls, preserve woodwork, ensure condensate drainage by gravity for maximum reliability.
Design and positioning: the art of the “right place”
Comfort isn't just about the brand: it's also about the location . Here, the interior head is installed high above the window sill , with a higher clearance optimized for air intake. This placement delivers three major benefits:
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Controlled stratification : the treated air flows along the ceiling then descends gently, homogenizing the temperature without drafts.
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Increased range : the blowing axis sweeps the circulation area, which reduces “hot pockets” near the glazing.
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Aesthetics : the unit visually aligns with the top of the joinery; the technology remains at the service of the decor.
Route of the connections: clean, short, efficient
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Exit to the left of the unit, immediately in the upper corner of the wall , then through opening towards the side facade overlooking the interior courtyard.
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Black finishing capping at the top of the wall, chosen to blend in with the shadow of the cornice and preserve the reading of the woodwork.
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Estimated length of connections (refrigerant copper + drain + cable): ≈ 2.5 to 3.5 m , which limits pressure losses and optimizes seasonal efficiency.
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Condensate : gravity with continuous slope, without pump; less maintenance, less noise, more reliability.
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Drilling : 2-1/2" core, sheath and vapor barrier in place, high density insulation to prevent any air or moisture infiltration.
AirGreen Methodology: Performance is born from detail
At AirGreen, each HVAC installation follows a rigorous protocol:
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Controlled bending of copper tubes, brazing under nitrogen and plugging until final assembly to preserve the interior of the pipes.
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High pressure nitrogen test , then deep vacuum to ≤ 500 microns , stabilization and leak test.
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Management of excess lengths in calibrated loops outside to preserve the refrigerant flow.
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Power supply on dedicated circuit with compliant circuit breaker; grounding and clear marking on the panel.
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Fine tuning : orientation of the shutters, “anti-draft” mode for winter, calibration of the fan according to the actual volume of the room.
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Finishing : sealing of penetrations, stainless steel fixings, joint capping and neutral silicone at sensitive points.
Result: immediate comfort, silence, and reduced bill
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Summer comfort : rapid temperature reduction without a "cold snap", thanks to the wide horizontal sweep and fine speed control.
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Additional heating : gentle heat output in very cool off-peak conditions, limiting the need for electric baseboard heaters.
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Acoustics : very low interior noise level; vibrations treated by silent blocks on the outside (not visible here) and by precise wedging of the support.
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Aesthetics : careful integration, hidden wiring, simple capping, respect for the lines of the furniture and woodwork.
Sizing and selection advice for Montreal, Laval, Longueuil, North Shore and South Shore
The right choice isn't just about BTUs. Our criteria:
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Envelope (insulation, orientation, glazing).
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Actual use (daytime presence, appliance heat, number of occupants).
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Route length (the shorter the better the seasonal efficiency).
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Condensate drainage (prefer gravity whenever possible).
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Permissible noise (proximity to rooms/neighbors).
In a Montreal plex living space, a well-placed 9,000 to 12,000 BTU head generally covers the majority of needs; beyond that, we favor multi-zone or a second head rather than a single oversized unit, to avoid "short cycling" and improve the annual COP .
Preventive maintenance: maintaining the energy advantage
Simple and regular HVAC maintenance preserves performance:
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Wash filters every 4 to 6 weeks during periods of heavy use.
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Dusting of the battery and fan (annual professional service recommended).
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Checking the gravity drain (slope, cleanliness of the pipe, intact vapor barrier).
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Inspection of the outdoor condenser (clearance, straight fins, no obstructions).
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Update ventilation settings before winter and before summer.
Result: more comfort, less consumption, and a longer lifespan for components.
Common Pitfalls Avoided on This Project
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Avoidable condensate pump : we have favored the natural slope; a pump is only installed if gravity is impossible.
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Drilling too low : high position limiting oil pressure losses and promoting natural drainage of the drain.
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Connections too long : short route, considered from the technical visit, to preserve the effective capacity and the SEER/HSPF .
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Invasive capping : corner route at the top of the wall, discreet black trunking for a clean finish.
Grants and programs (depending on eligibility of the chosen model)
For residences in Montreal , Laval , Longueuil , North Shore and South Shore , several programs may apply to wall-mounted heat pumps that meet performance criteria for heating in cold weather (e.g., efficient operation at −25°C or −30°C, energy certifications). We systematically verify eligibility, prepare proof (model, certification numbers) and guide our clients through the steps to maximize savings.
When to choose a second head or a multi-zone?
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Cross-section with distant parts: the reach of a single head may not be sufficient.
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Multiple floors : one head per level ensures consistency.
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Bedrooms : choose a small, quiet fan per area rather than over-blowing the living room.
AirGreen sizes without overselling: the objective is the right power in the right place , with a clean and sustainable route.
Our AirGreen signature
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Precise audit of the location, listening to usage, quantified scenarios.
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Cleanliness of execution : protections, clean drilling, seals and careful finishes.
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Documentation : installation photos, certificate numbers, vacuum test records.
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Support : reminder of good usage practices (modes, speeds, instructions), HVAC maintenance schedule, grant assistance.
In this project in Rosemont–La Petite-Patrie , the client gains quiet comfort in summer and winter, a respected interior, and a better controlled energy bill — all with a wall-mounted heat pump that is visually invisible but felt on a daily basis.
And for you?
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we study your space, compare the Zephyr, Gree, Fujitsu, Sharp or Midea ranges according to your priorities (silence, extreme cold, budget, aesthetics), and propose a sober and efficient implementation. A technical appointment is enough to draw up a clear plan, a transparent estimate and a rapid installation schedule - without compromising on quality.