A clean, quiet installation designed for Montreal winters
At AirGreen , we have just installed a Sharp wall-mounted heat pump in a plex in Mercier–Hochelaga-Maisonneuve . The goal: to provide stable comfort in both summer and winter, while reducing energy consumption thanks to a reliable inverter compressor and meticulous installation adapted to the climatic realities of Greater Montreal.
Client context and needs
The apartment, typical of the area's plexes, opens onto a covered gallery with protected walls. The owners wanted:
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effective cooling for the hot season,
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efficient additional heating during the off-season,
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a durable, discreet and easy-to-maintain HVAC installation,
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a clean integration of electrical and refrigeration connections in order to avoid recurring interventions.
After calculating loads and taking air circulation readings in the main rooms, we selected a Sharp wall unit correctly sized for the floor (usual range of 12,000 to 18,000 BTU , depending on the envelope and occupancy), in order to balance comfort and seasonal efficiency .
Technical details and choice of location
Outdoor Condenser Position
The Sharp Eco Inverter condenser is installed on a raised aluminum base , stable and corrosion-resistant. This choice:
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keeps the unit above snow and ice accumulation,
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promotes the evacuation of defrosting condensates,
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reduces the transmission of vibrations to the slab and structure.
Anti-vibration pads complete the assembly to maintain a very low noise level on the gallery and inside.
Management of connections and finishes
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The refrigeration pipes and communication cable are protected in a vertical white capping , ensuring a clean finish and mechanical protection against shocks and UV rays.
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The external disconnect box is positioned in the immediate vicinity of the unit, facilitating service operations and meeting good safety practices.
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The holes were made with a slight slope to promote flow and avoid any water retention in the crossing.
Power supply and protections
The device is powered by a dedicated circuit from the home's electrical panel, with a circuit breaker of the required rating and shielded wiring in the downcomer. This approach:
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limits electrical interference,
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secures the installation,
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simplifies diagnosis in case of maintenance.
Indoor unit and air diffusion
The wall-mounted unit is positioned high in the living area to optimize air stratification and reach . Motorized dampers ensure even distribution to the hallway and adjacent rooms, reducing cold spots and temperature overloads .
Results obtained and benefits for the client
Controlled thermal comfort
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Precise cooling in summer with rapid ramp-up and stable hold.
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Effective additional heating during mid-season temperature variations.
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Remarkably quiet operation , both inside and on the gallery.
Energy efficiency
Inverter technology continuously adjusts power. Result:
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longer and gentler cycles,
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reduced consumption compared to on/off devices,
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limited wear of components.
Aesthetics and durability
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The capping + base assembly protects the connections and preserves the aesthetics of the facade.
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Corrosion-resistant materials and stainless steel fasteners resist de-icing salts and humidity variations specific to Montreal.
Grants and Eligibility
High-efficiency wall-mounted heat pumps are generally eligible for Quebec programs promoting energy efficiency. We support our clients to validate eligibility and maximize the financial assistance available in Montreal, Laval, Longueuil, North Shore and South Shore .
What makes the AirGreen difference
Rigorous sizing
A well-sized device avoids:
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oversizing (frequent stops/starts, discomfort, additional cost),
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undersizing (lack of power at heat peaks).
Our surveys (envelope, internal contributions, orientation) guarantee a capacity consistent with the actual use of the accommodation.
Planting designed for winter
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Clearances maintained around the condenser for free airflow and efficient defrosting .
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Sufficient height to remain functional even during episodes of heavy snow.
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Keep away from sources of dust and projections (parking, driveways).
Finishing and maintenance
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Straight passage of lines in a watertight capping: fewer rough spots, easy access for service.
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Accessible disconnect box : safe and rapid interventions.
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HVAC maintenance advice given to the customer: cleaning of filters, visual inspection of capping, seasonal clearances around the condenser.
Practical advice for plex owners in Montreal
1) Think about airflow first and foremost
A condenser that is "too stuck" against a guardrail or side wall loses performance. Clear clearances are required at the suction and discharge sides.
2) Elevate unity
Raising the roof is essential in Montreal: it protects against heavy snow, prevents ice blocks under the base and extends the life of the casing and heat exchangers.
3) Take care of the crossings
A clean hole with slope and vapor barrier foam reduces air and moisture infiltration, improves acoustics and facilitates future disassembly.
4) Plan service access
The electrical panel and disconnect must be kept clear. Good accessibility reduces maintenance costs and speeds up troubleshooting.
5) Maintain regularly
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Indoor unit filters : clean every 4 to 8 weeks during intensive periods.
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External battery : gentle rinse in spring to remove dust and pollen.
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Visual inspection of the capping and base after winter.
Key steps in our HVAC installation process
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Technical visit : taking measurements, identifying routes, validating interior/exterior location.
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Sizing : choice of capacity, verification of intensities and wiring.
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Fixings and drilling : anchored supports, drilling with slope, edge treatment.
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Connections : vacuum drawing, leak tests , refrigerant charge according to specifications.
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Electrical : dedicated circuit, disconnect within range, safety tests.
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Commissioning : checking pressures/temperatures, calibrating remote controls, explaining to the customer.
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Follow-up : support, maintenance reminders and availability of our team for the coming seasons.
Frequent Pitfalls…and How We Avoid Them
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Discontinuous capping : causes friction and air leaks. We install perfectly fitted lids .
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Condenser too low : trapped by snow. We systematically raise it and validate the clearances.
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Hard-to-reach disconnection : lengthens the interventions. We install it in the right place , cleanly and with sufficient clearance for the wiring.
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Poorly managed defrost drain : puddles and ice. We plan the slope and drainage areas to avoid re-entry onto the slab.
Why choose AirGreen in Montreal, Laval, Longueuil, North Shore and South Shore
Because beyond the material, the difference lies in the installation details , the quality of the finishes and the training provided to the client. Our team delivers clean, documented and optimized construction sites to last. In Mercier–Hochelaga-Maisonneuve as elsewhere, we carefully integrate the heat pump into the building, for lasting comfort and controlled consumption.