Reliable heating in extreme cold and quiet air conditioning for a suburban home
In this project in Sainte-Rose (Laval) , we are installing a Fujitsu AIRSTAGE wall-mounted heat pump on a brick facade, high up on wall brackets . The goal: stable comfort all year round, discreet integration, controlled vibrations and easy access for maintenance - all while respecting the requirements of a single-family home with a backyard.
Customer context and load assessment
The owner wanted to replace a window air conditioner and reduce his winter electricity bill. The ground floor includes a west-facing living room with patio doors, an open kitchen, and a staircase leading upstairs. We performed a simplified load calculation: good quality envelope, properly insulated attic, moderate air infiltration. Peak needs lead to a unit ≈ 12,000–15,000 BTU/h capable of heating efficiently down to −26 °C . Fujitsu's AIRSTAGE R-32 platform is the preferred choice for its high seasonal efficiency and fine modulation at low speeds, ideal for Quebec's shoulder seasons.
Technological choice: why Fujitsu AIRSTAGE (R-32)
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Efficiency : R-32 refrigerant improves efficiency compared to R-410A and reduces the load, guaranteeing savings in air conditioning and heating.
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Extreme cold : Fujitsu's high-performance wall-mounted range maintains a useful capacity below -20°C , with defrosting logic that preserves the heat delivered to the rooms.
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Quiet : Inverter motor and profiled exterior fan for low noise levels – an asset in a quiet residential area.
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Reliability : Proven components, surge protection and well-ventilated electronic boards inside the housing.
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Control : Weekly timer, Night Quiet mode and Wi-Fi compatibility depending on the indoor head chosen.
Remember : a modern wall-mounted heat pump is not just for air conditioning; it provides efficient heating for most of the winter in Montreal , Laval and the North Shore , by replacing or replacing electric baseboard heaters.
Exterior installation: wall brackets on brick, clearances and anti-vibration
The condenser is fixed to the brick wall , approximately 1.8 m from the ground. This height protects the unit from snow accumulation, facilitates the flow of defrost water and frees up floor space.
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Galvanized brackets sized for dynamic load; mechanical anchors suitable for brick, tightened to the recommended torque.
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Anti-vibration pads under the unit pads to cut structural transmission to the masonry and eliminate hums perceived inside.
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Clearances are maintained at the back, bottom and front of the grille; the unit is positioned away from an awning and a wooden fence, as well as a nearby satellite dish, to avoid any air recirculation and to preserve service access.
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Laser checked level and plumb to ensure compressor oil stays where it should and defrost drain drains properly.
Refrigeration route, drilling and finishing
We favor the shortest route : direct crossing of the wall behind the condenser towards the interior head placed in the living room.
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Core drilling with a slight outward slope for a gravity drain in air conditioning mode (no pump required).
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Insulated copper refrigeration connections (high density closed cell); all joints are brazed then heat insulated, with UV protection tape on exposed sections.
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Discreet exterior capping , in a neutral tone to match the carpentry and masonry, for a clean and durable finish.
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Estimated total length ≈ 2–3 m , which reduces pressure losses and improves the response of the installation.
Power supply and compliance
In the immediate vicinity of the unit, we install an external disconnect switch (waterproof box) visible on the facade. The dedicated circuit from the main panel receives the rating and circuit breaker prescribed by the manufacturer. Before commissioning:
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Nitrogen pressure test to check for leaks.
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Deep vacuum until stable pressure is reached, proof of absence of moisture and leaks.
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Opening of valves , control of intensities, subcooling and superheating .
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Setting Quiet mode and eco setting.
Noise management: good practices in the neighborhood
In a suburban home, sound perception matters as much as the dB value.
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Mechanical decoupling via pads and neoprene spacers.
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Blowing orientation to avoid reflections on the steel sidewall and fence.
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Night regime : activation of a softened profile between 10 p.m. and 6 a.m., while maintaining comfort.
Result: controlled noise level on the terrace and no vibrations transmitted to adjacent rooms.
Indoor commissioning: comfort and diffusion
The interior (wall) head is positioned opposite the living area. We adjust:
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Vertical sweep for gentle mixing without drafts on the sofa.
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Instructions adapted to habits: 23–24°C in air conditioning in hot weather; 20–21°C in heating to maximize the SCOP .
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Weekly programming to reduce power demands during Hydro-Québec peaks.
Defrosting and water management in winter
Defrosting is a normal cycle: the machine temporarily reverses the flow to melt the ice. High-rise installation:
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Prevents ice from trapping the base of the unit.
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Promotes flow without accumulation on the sidewalk.
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Limits splashes on the patio door thanks to the positioning and natural slope of the facade.
Measured results and expected gains
After balancing and testing:
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Uniform temperature on the ground floor; better distribution towards the staircase.
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Estimated 25-40% reduction in heating costs compared to electric baseboard heaters, depending on winter severity.
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Better controlled humidity in summer thanks to low speed modulation which extends the time the air spends on the evaporator.
HVAC Maintenance: What Prolongs Performance
To maintain effectiveness and warranty:
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Clean the inner head filters every 4 to 8 weeks during peak season.
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Gently rinse the external battery in spring and fall (low pressure).
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Inspect the capping and UV insulation once a year.
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Have an annual AirGreen HVAC maintenance carried out: pressure checks, electrical measurements, verification of supports and defrost flow.
Grants and Eligibility
High-performance R-32 wall-mounted heat pumps are generally eligible for provincial programs (including Efficient Heat Pumps ). We support our clients in evaluating the equipment, proving performance and preparing the file, whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore .
Pitfalls to avoid when installing on a brick facade
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Undersizing the brackets or using anchors that are unsuitable for the brick: risks of noise and subsidence.
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Ignoring the required clearances around the front grille: reduced performance and too frequent defrost cycles.
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Forget the slope of the drilling: water stagnation in the sheath in summer.
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Neglect the night profile : a simple speed limit avoids noise pollution.
Why AirGreen for your HVAC system?
Our HVAC installations combine load calculation, selection of suitable heat pump equipment, thoughtful installation (wall, slab, roof, balcony), electrical compliance and meticulous commissioning . We respond quickly in Laval , Montreal intramural , Longueuil , North Shore and South Shore , with attentive after-sales service and HVAC maintenance contracts that secure your energy savings.
Construction site technical sheet (summary)
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Type : 1-zone wall-mounted heat pump , R-32 refrigerant
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Brand : Fujitsu AIRSTAGE (high-performance wall-mounted range)
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Target capacity : 12–15 kBTU/h (depending on calculated load)
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Installation : brick facade, wall brackets with anti-vibration pads , high anti-snow position
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Route : direct drilling, connections ≈ 2–3 m, discreet external capping , gravity drain
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Electrical : dedicated circuit + waterproof disconnection nearby
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Objectives achieved : four-season comfort, silence, performance in extreme cold , clean and sustainable integration
Need a similar solution in Sainte-Rose , Chomedey , or elsewhere in Greater Montreal ? We offer clear quotes, fast planning, and careful installations tailored to your home's architecture and the reality of our winters.