4-season comfort for a suburban home: a multi-zone R-32 mounted on brackets, quiet, efficient and ready for our winters
Context: a Laval house that wants everything... without compromise
In Sainte-Dorothée , needs vary from one room to another: a south-facing living room that overheats in the summer, bedrooms that require stable heating in the early morning, a cooler basement that needs dehumidification. We installed a GREE Multi R32 MultiZone heat pump , ideal for powering multiple indoor heads from a single outdoor condenser . The goal: maximize energy efficiency and control flexibility, while preserving the aesthetics of the pale brick facade.
Why a GREE MultiZone R-32 heat pump ?
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A single outdoor unit for 2 to 5 rooms: less space, less noise in the yard and simplified maintenance.
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R-32 refrigerant : better environmental compromise and higher performance compared to R-410A.
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Wide modulation : adapts to partial loads (cool nights, inter-seasons), therefore real savings throughout the year.
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Compatibility with a wide range of GREE wall/cassette/console heads depending on the room.
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Extreme cold operation (depending on the head chosen), relevant for Greater Montreal .
Study and sizing: the basis of a sustainable HVAC installation
Before installation, we carry out a room-by-room thermal assessment :
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Surface area, insulation, orientation and air infiltration;
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Occupations and internal contributions (lighting, appliances);
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Architectural constraints for the passage of lines and the location of heads;
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Balancing capacities between zones (e.g. 9k BTU in the living room, 9k in the master bedroom, 12k in the basement, according to calculations).
The Multi R32 condenser is selected so that the total connected capacity and the simultaneously available capacity respect the manufacturer's ranges, with margin for peak demand.
Exterior integration: neat, solid, designed for our winters
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Support on galvanized wall brackets : ground clearance to avoid snow and facilitate defrosting; anti-vibration pads to limit transmission to the wall.
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Clearances maintained around the fan and suction/discharge sides to preserve air flow .
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Disconnect box and dedicated power supply installed in the immediate vicinity, wiring protected and compliant with the Code.
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Refrigeration connections under black UV capping , short and clean route along the facade, sealed penetration to prevent any infiltration of air or water.
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Defrost condensate management : natural slope towards the outside; addition of piping accessories as needed to direct water away from the aisles.
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Customer recommendation: provide a snow guard above if the eaves create ice falls.
Execution details: from soldering to commissioning
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Torque flaring , brazing under nitrogen and protection of the insulators for a clean internal line without scale.
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Nitrogen test and leak detection, then deep vacuum (< 500 microns) with stabilization.
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Refrigerant charge adjusted according to the actual length of the lines and the number of active heads.
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Setting of defrosting , nighttime silent mode and blowing curves; cold and hot tests.
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Occupant training : filter maintenance, best practices for multi-zone use, programming instructions.
Inside: Room-by-room flexibility
Each area receives the head adapted to its use:
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Living room : wide sweep wall head to cover the open area.
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Bedrooms : reduced speeds, minimal noise level for the night.
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Basement : priority to summer dehumidification .
Multi-zone logic allows for separate settings ; this avoids over-air conditioning the rest of the house when only one room is occupied.
Results observed after commissioning
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Consistent and rapid comfort without localized overheating.
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Lower electricity consumption vs. older window units and space heaters.
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Silence outside and inside, appreciated by the neighborhood.
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Preserved facade : discreet route, aligned boxes, straight capping and clean connections.
Usage tips to maximize performance
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Allow to modulate : avoid turning off completely between presences; the heat pump is more efficient when maintained.
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Program day/night settings; use dry and eco modes depending on the season.
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Filters : Clean every 4–6 weeks; more frequently if pets are present or renovations are required.
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Exterior Clearances : Keep snow and leaves clear in front of the condenser.
HVAC Maintenance: Recommended Schedule
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Spring : deep cleaning of the evaporators and checking the condensate flow.
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Fall : inspection of electrical connections, tightening torques, probes, and testing of defrost cycles.
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Every 2–3 years : performance audit and leak-tightness check of connections.
Regular maintenance ensures seasonal performance , compressor longevity and prevents capacity drops during peak periods.
Grants and Eligibility
R-32 wall-mounted and MultiZone heat pumps that meet recognized efficiency thresholds may be eligible for assistance programs in Quebec . We support our customers in Montreal , Laval , Longueuil , the North Shore and the South Shore to validate eligibility , gather proof of performance, and provide the documents required by the programs in force.
Common mistakes… and our solutions
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Undersizing of a very sunny area → We size each head according to actual sensible/latent loads .
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Too long a route and pressure losses → We favor short routes and grouping of penetrations.
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Vibrations transmitted to the facing → Anti-vibration pads , controlled tightening, calibrated brackets.
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Air outlets blocked in winter → Clearances respected, customer recommendations for snow guards if necessary.
Why AirGreen for your MultiZone HVAC installation ?
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Rigorous calculations , clean installation and written guarantee .
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Instrumented commissioning (deep vacuum, functional tests).
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Responsive after-sales service and planned preventative HVAC maintenance .
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Expertise on GREE R-32 ranges (wall and multi-zone) and integration on brick facades typical of the suburbs of Laval.
Conclusion
The GREE Multi R32 installed in Sainte-Dorothée (Laval) delivers truly modular 4-season comfort , with discreet and durable exterior integration: wall brackets clear of the ground, dedicated electricity, careful capping and compliant commissioning procedures. For a multi-room project in Greater Montreal , it is a reliable , energy-efficient and scalable solution that fits perfectly into local climatic realities.