An exterior installation above the garage that maximizes performance and space
At AirGreen , we design each HVAC installation as a custom project. In Boisbriand , on the North Shore , we are working on a brick condominium where the client wants a Carrier wall-mounted heat pump to ensure four-season comfort without losing floor space. The ideal location is essential: above the garage door , on sturdy wall brackets , with secure service access and compliant clearances.
Client background and objectives
The owner aimed for three concrete results:
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Efficient air conditioning of living areas in summer, without noise pollution for the neighborhood.
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Reliable heating down to low temperatures, to reduce the need for electric baseboard heaters.
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Preservation of the outdoor space and the passageway in front of the garage.
We recommend a Carrier wall-mounted, monosplit heat pump , sized according to the heat load of the main rooms. The range offers typical capacities of 9,000 / 12,000 / 18,000 BTU , with high seasonal efficiencies and Energy Star certification on several versions. The selected unit offers capacity maintenance relevant to the Montreal climate zone .
Exterior installation: why above the garage?
Clearances, safety and traffic
Installing the condenser at a height frees up the vehicle access route, limits the risks associated with snow accumulation and maintains optimal air clearance around the exchanger. We respect the required distances at the rear, sides and front of the unit to guarantee air flow and maintenance access .
Brackets and anchors
We install galvanized brackets with certified load-bearing capacity, equipped with anti-vibration pads and crosspieces ensuring rigidity. Anchoring is done in the sound brick using construction-grade mechanical/adhesive anchors ; the support points are leveled to avoid any stress on the frame. A waterproof seal protects each anchor from infiltration.
Thaw and water management
In heating mode, a defrost cycle generates water. Above a garage entrance, we provide a discreet deflector under the unit and directed drainage to prevent a patch of ice from forming on the driveway. On brick facades, the openings are caulked with polyurethane to preserve the envelope.
Refrigerated and electrical journey: cleanliness and sustainability
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Refrigeration lines (insulated copper) drawn from the indoor head located on the residential side, with a neat service loop behind the condenser to limit mechanical stress.
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Condensate drain from the indoor unit laid on a continuous slope , ideally gravity-fed towards the outside; if the architecture requires it, we integrate a silent and accessible lifting pump .
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Communication and power wiring protected in a UV sheath with neutral-colored covering on the brick. An external disconnect switch is installed in the immediate vicinity of the condenser, compliant with Quebec electrical requirements.
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Wall penetration via a clean core drill ; fire rings and intumescent mastic when the configuration requires it (garage fire wall).
Meticulous commissioning
Our teams apply a rigorous procedure, a guarantee of long-term reliability:
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Calibrated flares and tightening torques on the dynamometer .
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Nitrogen pressurization for leak testing, followed by a foam solution and electronic detector test.
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Deep vacuum drawing down to ≤ 500 microns , vacuum maintenance and resistance validation.
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Refrigerant release , superheat/subcool balancing according to Carrier specifications.
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Checking intensity/consumption , supply/return temperatures , noise , vibrations , and setting comfort modes .
Specific details observed at this site
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Useful height : positioned above the garage arch to avoid tailgate impacts and keep a free area on the ground for snow removal.
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Brick facade : discreet cladding, coordinated color, stainless steel screws for resilience to bad weather .
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Disconnect switch located on the right of the unit, accessible for maintenance.
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Compact line path to limit load losses and improve device responsiveness.
Sizing: The right size, not the biggest
Comfort and efficiency depend on accurate sizing . On this project, the cooling/heating load was calculated from:
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of surface , insulation and orientation ;
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internal gains (occupancy, devices);
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air infiltrations .
The result: a capacity that covers 95% of annual needs without oversizing . This reduces short cycles, improves relative humidity in summer and increases compressor life .
Everyday performance and comfort
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Reliable heating down to -20 to -25°C depending on the version chosen, with power maintenance and optimized defrosting to limit temperature variations.
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Reduced exterior and interior noise level , ideal for co-ownerships and close-knit communities on the North Shore .
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Eco mode and automatic restart after power off.
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Multi-stage filtration on the indoor unit, beneficial for air quality.
Recommended preventive maintenance
A heat pump performs well when it is maintained:
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Clean the inner head filters every 4 to 8 weeks during use.
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Annual inspection: batteries (indoor/outdoor), fans , line insulation , pressure/temperature measurements .
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Check the hood and anchors ; tighten if necessary after the first freeze/thaw cycle.
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Check the drip deflector and the area under the appliance during the winter to prevent ice .
AirGreen offers HVAC maintenance plans tailored to the climate of Montreal, Laval, Longueuil, North Shore and South Shore .
Grants and Eligibility
Several Carrier Energy Star and cold climate performance models are eligible for current programs (e.g., LogisVert and federal initiatives where available). We support our customers in:
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verification of technical criteria (yields, cold capacity);
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preparation of documents (detailed invoice, AHRI number );
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optimization of processing times .
Common mistakes… and how to avoid them
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Undersized brackets : we use certified brackets with safety margin and anti-vibration pads .
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Insufficient cladding : We carefully close each segment to protect the copper and insulation from UV rays and birds.
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Poorly designed drain : controlled slope, air trap if required, anti-freeze protection when the drain is exposed.
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Leaky holes : Our finishes use closed-cell foam and brick-safe sealant for a continuous barrier .
Installation review
The Boisbriand client now benefits from a compact, quiet , and energy-efficient HVAC solution that doesn't encroach on the parking area. The elevated location facilitates snow removal , preserves the facade, and ensures increased condenser longevity . The Carrier heat pump meets the home's real-world thermal needs, with optimized year-round operating costs .
AirGreen: your HVAC partner throughout Greater Montreal
Our certified teams respond quickly in Montreal, Laval, Longueuil, North Shore and South Shore . We handle consulting , sizing , installation , commissioning and maintenance . Each project benefits from technical monitoring and subsidy support to deliver a sustainable and measurable result .
For a similar project— a wall-mounted heat pump on brackets above a garage or any other configuration— AirGreen ensures a neat, compliant HVAC installation designed for the local climate.