A precision construction site on a brick facade: performance, cleanliness and compliance signed AirGreen
Project background
In Villeray–Saint-Michel–Parc-Extension , a brick duplex owner was looking for a four-season heating and cooling solution for the main floor without disrupting the existing structure or the aesthetics of the backyard. Our recommendation: aSharp ZU1 series wall-mounted heat pump (new generation R-32 ), chosen for its fine modulation, low noise level, and low-temperature stability—an ideal trio for Greater Montreal .
Why the Sharp ZU1 series for a Montreal duplex
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High-precision inverter : continuous modulation reduces consumption peaks and maintains a stable temperature, summer and winter.
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Cold-climate efficiency : defrosting curves optimized for our winters, ensuring good COP when the mercury drops.
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Controlled acoustics : large diameter fan and damped chassis, perfect for Montreal 's alleys and interior courtyards.
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R-32 refrigerant : more efficient, with a reduced charge per kW delivered.
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Simplified maintenance : direct access to key components for our annual HVAC maintenance visits.
Exterior installation: wall brackets, support column and regulatory clearances
Choice of support
In this project, the outdoor unit is fixed at ground level on sturdy wall brackets . A steel column (painted anti-corrosion) provides additional mechanical support and reduces the vibration lever arm. This assembly:
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clears the ground to avoid snow and defrost water;
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protects the machine from shocks (snow removal, moving objects);
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facilitates access for battery cleaning and electrical measurements.
Anti-vibration pads isolate the machine from the masonry, limiting sound transmission inside.
Clearances and air circulation
We have respected the front and side clearances to preserve the airflow and avoid any recycling, particularly important in heating mode. The unit is positioned off-axis from the windows to prevent the rejection of hot air towards the interior in summer and to limit the acoustic impact.
Refrigeration and electrical route: short lines, neat elbows, 240 V disconnector
Discreet and waterproof technical ducts
The brick duplex requires a visible exterior passageway. We opted for black technical trunking with watertight joints, laid with a line :
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vertical rise from the unit,
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horizontal return under cornice,
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protected descent to the entrance hole.
The curvature radii are respected so as not to crush the insulation or create pressure losses. Everything is fixed on dowels adapted to solid brick, with anti-capillary interposition between accessories and facing.
Shortening lengths and vacuum drawing
The total length of the lines is optimized to limit the added refrigerant charge and preserve seasonal efficiency. Before commissioning:
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nitrogen test + bubble control (sensitive points on flare and valves),
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deep vacuum < 500 microns, stabilized,
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vacuum resistance control to exclude any micro-leaks.
Food and safety
A 240V outdoor disconnect switch is installed within easy reach of the equipment, compliant with current code. Wiring is routed in rigid, watertight conduit with drip loops to prevent capillary infiltration. Circuit labeling at the electrical panel facilitates after-sales service.
Interior integration: uniform comfort and condensate management
Positioning the wall head
The indoor head blowing onto the main living area ensures efficient airflow . The load calculation guided the capacity selection (12–18 kBTU depending on volume and insulation), with priority given to modulation to avoid the yo-yo effect.
Condensate drainage
The layout allows for quiet gravity drainage . Where a slope is not possible, we provide a mini-float pump with a check valve and alarm; here, the continuous slope has eliminated the need for a moving part, reducing maintenance.
Results measured at commissioning
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Pulse temperature stabilized quickly in cold mode, with compliant deltaT.
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Compressor/fan intensity within manufacturer tolerances.
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Overheating and subcooling validated after 20 min of operation.
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Almost imperceptible vibrations thanks to the buffers and column reinforcement.
What we are monitoring in Villeray–Saint-Michel–Parc-Extension (and elsewhere in Montreal)
Constraints specific to brick facades
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Limited and sealed perforations: sleeves, fire-resistant foam , sealing strip.
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Perfect alignment of the chutes for clean visual reading over long distances.
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Keep away from dryer vents and stale air intakes that could heat the outdoor unit's suction.
AirGreen best practices (to remember)
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Raise or fix to the wall to protect against snow accumulation.
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Mandatory and accessible disconnect switch .
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Refrigeration lines as short as possible, gentle bends, intact insulation.
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Clearances guaranteeing airflow and stable capacity in both cold and hot conditions.
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Commissioning log with records sent to the customer for traceability.
HVAC Maintenance and Longevity
An annual HVAC maintenance plan secures performance:
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gentle washing of the external exchanger, inspection of the defrosting tray and the propeller;
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cleaning the inner head filters and checking the fan;
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control of torques on terminal blocks and intensities;
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visual inspection of insulation and ducts (UV, freeze/thaw).
Regular maintenance preserves 10–15% seasonal efficiency and extends compressor life.
Grants and Eligibility
Many new-generation wall-mounted heat pumps meet the requirements of Quebec's assistance programs. Depending on its capacity and low-temperature performance, the Sharp ZU1 may meet Energy Star and cold-climate criteria. We verify eligibility on a case-by-case basis and assist customers in Montreal, Laval, Longueuil, the North Shore, and the South Shore with the paperwork (technical specifications, installation photos, and detailed invoices).
Deadlines and organization of the worksite
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Morning : protection of surfaces, installation of brackets, installation of the column, drilling, installation of the trunking.
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Midday : pulling lines and cables, calibrated flares, leak tests.
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Afternoon : vacuum extraction , opening of valves, cold/hot tests, configuration, delivery of operating instructions and maintenance log.
The site is cleaned up : excess screws, insulation scraps, and packaging are removed. Neighbors appreciate the lack of background noise and the discreet nature of the installation.
Pitfalls Avoided on This Project (and How We Avoid Them at AirGreen)
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Too long vertical lines without support: we pace the fixings to protect the flare.
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Air recycling against the facade: we clear the blowing and move the unit away from the projections.
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Frost under the machine : no installation directly on the floor; wall mounting eliminates the ice plate.
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Infiltrations at the openings: fire-resistant foams and sealing flaps.
Why choose AirGreen for your HVAC installation?
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Local expertise : teams trained in Montreal brick duplex/triplex typologies.
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Documented work : complete commissioning reports and personalized usage advice.
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Structured after-sales service : HVAC maintenance contracts with automatic reminders.
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Coverage : rapid interventions in Montreal, Laval, Longueuil, North Shore, South Shore .
Need a quote?
We schedule a technical visit, confirm the indoor header location, validate the capacity (BTUs), and propose the most efficient solution for your building—with no surprises on site.
Useful keywords: heat pump , wall-mounted heat pump , Sharp ZU1 , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Villeray–Saint-Michel–Parc-Extension .