When a smart location maximizes performance… and peace of mind
At AirGreen , we have just completed the installation of a new-generation Sharp wall-mounted heat pump using R-32 refrigerant in a residential building in Côte-des-Neiges–Notre-Dame-de-Grâce (Montreal) . The project perfectly illustrates what we advocate every day: an HVAC installation designed to the millimeter, compliant with current standards (A2L), and optimized for the Montreal climate. The outdoor unit is placed on a raised support sheltered by a concrete canopy; the condensate drain is directed cleanly; the power supply has its own cut-off box ; the length of refrigerant lines is reduced. The result: a quieter, more reliable, and more economical system… all year round.
Client context and objectives
The client wanted:
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Efficient heating in extreme cold without sacrificing the visual privacy of your backyard.
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Fast and even air conditioning in the main living area.
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An energy-efficient solution, eligible for grant programs in effect in Greater Montreal.
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A clean, durable and easy-to-maintain installation.
After a site visit and load calculations, we confirmed that a Sharp wall-mounted heat pump fully met the needs, with the necessary margin for summer heat spikes and January cold spells.
The technical choices that make the difference
Brand and technology
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Brand: Sharp , renowned for its very stable inverter motors and Eco Inverter outdoor units.
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Refrigerant: R-32 (A2L) , with a lower GWP than R-410A, allowing for better seasonal efficiencies.
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Type: wall-mounted heat pump (mini-split), ideal for a home without a duct network.
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Operating range : extreme cold configuration for sustained heating performance in Montreal winters.
Installation of the outdoor unit
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Raised aluminum stand : keeps the device away from snow, prevents water/frost accumulation around the chassis and limits dust absorption.
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Under-canopy : the unit is sheltered from direct weather , while maintaining the free space required for air intake and discharge.
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Defrost management : a dedicated condensate drain directs defrost water, preventing puddles and ice on the slabs.
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Wiring and safety : presence of an external disconnect within easy reach, compliant with the Code, to facilitate maintenance and service interventions.
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Connection path : short, straight path between the internal head and the condenser, ensuring minimized pressure losses and higher efficiency .
Installation of the inner head (housing side)
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High position for controlled stratification and even diffusion.
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Clearances respected around the shutters so as not to disrupt the sweep.
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Clean and insulated through passage , with discreet external cover protecting the refrigeration lines and the drain.
What the R-32 configuration changes for the customer
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Better seasonal coefficients : R-32, combined with the Sharp inverter compressor, allows for a high SEER/HSPF , therefore less electricity for equal comfort.
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Simplified maintenance : the geometry of the circuit, the reduced length of the lines and the positioning of the disconnect facilitate diagnostics and interventions.
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A2L Compliance : Our teams apply brazing, nitrogen testing and vacuum procedures that comply with A2L requirements; commissioning includes leak testing and precise loading .
AirGreen Site Challenges and Solutions
1) Slab and limited vertical clearance
The concrete canopy provided ideal protection, but reduced vertical clearance . We selected a custom bracket that provided:
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the required clearance height for airflow;
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the rigidity necessary to limit vibrations;
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a distribution of loads on the slabs to avoid punching.
2) Management of defrosting water
In winter, the heat pump discharges water. A drain properly routed to a runoff area prevents the formation of ice patches near pedestrian traffic.
3) Optimal refrigerated journey
To stabilize pressures and preserve the coefficient of performance , we adopted a direct route with a minimum of elbows, high-density insulation , and careful sealing at the piercing point.
Everyday performance and comfort
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Reliable winter heating : the machine maintains a constant heat output during defrost cycles thanks to intelligent inverter management.
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Fast cooling : the ramp-up is responsive without jolts; the target temperature is reached quickly and smoothly .
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Quiet : Rigid mounting of the bracket, leveling and limitation of structural resonances result in quiet operation both outdoors and indoors.
Grants and potential savings
In Greater Montreal (Montreal, Laval, Longueuil, North Shore, South Shore) , a high-performance R-32 wall-mounted heat pump may be eligible for assistance depending on current programs and efficiency criteria. Our team supports our clients in:
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eligibility verification ;
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preparation of documents (detailed invoices, serial numbers, certificates);
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submissions to the relevant bodies.
HVAC Maintenance Best Practices (AirGreen Tips)
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Clean the inner head filters every 4 to 8 weeks during periods of heavy use.
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Annual inspection : pressures/temperatures, tightness of connections, A2L leak test, condition of insulation and drain.
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Exterior clearances : keep the unit free of debris, leaves, snow.
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Winter use : in case of extreme cold and blowing snow, check that the drain outlet remains open.
Why Sharp… and why AirGreen?
Sharp combines robust design with precise modulation algorithms , providing excellent thermal comfort and appreciable longevity .
AirGreen is:
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recognized field expertise in residential HVAC installation ;
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RBQ-certified teams trained in A2L refrigerants;
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responsive after-sales service , accessible parts and technical support;
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a consultancy approach : correct sizing, thoughtful implementation, complete documentation.
Feedback: what the customer sees, what the invoice measures
From the first start-ups, the customer noticed:
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rapid lowering of the indoor temperature in air conditioning mode;
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stable heating without overheating or direct draft;
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a reduction in kWh compared to the old electric backup system, thanks to an advantageous COP in mid-season.
In winter, the elevated and sheltered unit remains free of snow drifts, air circulates freely, and defrost cycles run smoothly.
Implementation advice for similar projects in Montreal, Laval and Longueuil
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Always prioritize shelter (awning, balcony) without compromising airflow.
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Raise at least 30–45 cm above the finished level to avoid snow and facilitate drainage.
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Limiting the length of lines and the number of bends is the key to sustainable performance .
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Provide an accessible disconnect and a drain directed to a non-traffic area.
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Validate grant eligibility before purchase: Some requirements impose minimum performance levels and certified installation .
In summary
This Sharp wall-mounted heat pump installation in Côte-des-Neiges–Notre-Dame-de-Grâce combines the right product selection , ingenious installation , and careful execution . The customer gains four-season comfort , tangible energy savings , and a long-lasting HVAC system , supported by AirGreen's maintenance and financial assistance.