Installation of two Gree (R32 series) wall-mounted heat pumps in Rosemont–La Petite-Patrie

Two outdoor units on wall brackets for stable comfort and real savings in a Rosemont plex

At AirGreen , we have just completed the installation of two Gree wall-mounted heat pumps – R32 range in a brick plex in Rosemont–La Petite-Patrie . The owners' objective was clear: to efficiently air condition and heat two apartments , reduce operating costs and preserve the aesthetics of the facade. The chosen configuration – two independent condensers fixed on galvanized wall brackets – allows for natural redundancy, cycles adapted to each apartment and simplified maintenance.

Building context and customer needs

The building is a typical Rosemont duplex: red brick facade , rendered base, rear alley and side clearance for maintenance. Each apartment has distinct thermal needs (solar exposure, waterproofing, occupancy). Rather than a single multi-zone system, the choice fell on two single-zone systems in order to:

• Segment consumption and make each occupant responsible;

• Optimize yields (one compressor per zone, finer modulation);

• Simplify service interventions without immobilizing the entire building.

Why Gree (R32 range) for Greater Montreal

The Gree R-32 wall-mounted range combines inverter and proven power electronics , with competitive seasonal ratios for our winters. Highlights sought by plex owners in Montreal, Laval, Longueuil, North Shore and South Shore :

• Wide modulation to maintain the setpoint without overheating or overcooling;

• Noise contained both outside and inside;

• R-32 refrigerant , with reduced global warming potential compared to R-410A;

• Common components and parts availability, an asset for sustainability.

Depending on the exact model and power, these devices may meet the eligibility criteria for certain grants . We always validate the brand/model/capacity pair before committing to a file assembly.

Outdoor installation: clean, robust, designed for winter

In the photo, the two Gree condensers are placed on heavy wall brackets , with blue anti-vibration pads under each foot. This configuration has several advantages for Greater Montreal :

• Snow clearance : Units are raised approximately 45–60 cm above ground level, which limits accumulation during the thaw period and protects the underbody.

• Free air circulation : the distance from the wall complies with the manufacturer's recommendations, essential for defrosting and condensate drainage.

• Less mess : the wall-mounted installation keeps the exchangers away from gravel and salt thrown up by the tires.

• Easy maintenance : access to the sides and bottom remains clear for seasonal washing.

Power wiring runs in metallic conduit (EMT) with a disconnect box positioned nearby—a safety detail and RBQ/CSA compliance . Insulated refrigerant lines follow a compact route along the facade, under UV capping when exposed, to protect the insulation from the elements.

Route of connections and management of condensates

Each system serves a dedicated indoor head. The route has been designed to minimize the equivalent length and reduce pressure losses :

• Wall crossing behind each head when possible (“back-to-back” configuration);

• Bending radii respected to prevent any pinching of the copper tubes;

• Priority gravity drain , with controlled slope to avoid backflow.
  In the rare areas without a natural slope, we plan a silent condensate pump; here, gravity was sufficient, reducing maintenance and noise.

AirGreen installation methodology

Our standard procedure , followed for both systems, includes:

1. Structural survey (load-bearing brick, joints, metal bridges) and positioning of the bracket plates on suitable anchors.

2. Calibrated drilling and installation of sleeves to prevent friction between the tubes.

3. Soldering/crimping according to the manufacturer's technology, with nitrogen test and leak test.

4. Deep vacuum (target ≤ 500 microns ) and maintenance: essential for the longevity of the compressor and the oil.

5. Fluid opening , superheat/subcooling control, current verification.

6. Functional validation of each mode (cold/heat/defrost), reading of status codes and instructions.

7. Finishing : waterproof cappings, seals, horizontal alignment of the condensers for a clean and symmetrical facade.

Choosing two single zones vs. one multi-zone: decision elements

In a plex, double single-zone is often required when:

• Thermal loads vary significantly from one dwelling to another;

• We want separate billing or clear responsibility per accommodation;

• Access and maintenance logistics must remain independent ;

• The facade allows two harmonious layouts (like here).

Conversely, a multi-zone system is relevant when outdoor space is limited or when several heads in the same home need to be supplied by a single condenser . We systematically carry out a sizing taking into account line lengths, pressure losses and facade constraints before making the choice.

Expected results and gains

• Immediate summer comfort : sufficient cooling capacity for living rooms and bedrooms, with inverter modulation limiting temperature variations.

• Additional heating during the off-season, limiting the use of the main system and lowering the bill .

• External noise controlled thanks to the orientation of the fans and the anti-vibration support .

• Maintenance : direct access to each unit, possibility of working on one unit without affecting the other.

Recommended HVAC maintenance

To maintain performance:

• Cleaning of external exchangers in spring and autumn (low pressure water, suitable products).

• Winter clearance : Keep 30–45 cm clear around and under units; avoid snowdrifts that obstruct defrosting.

• Annual inspection by AirGreen: electrical tightening, load control, reading of history, leak test if necessary.

• Inside: Dust filters every 4–8 weeks depending on use.

Grants and Eligibility

In Montreal, Laval, Longueuil, North Shore and South Shore , many programs require minimum seasonal performance and low temperature heating capabilities . Since Gree R-32 ranges offer a variety of variations, we confirm eligibility based on the exact reference (model number, BTU, technical data sheets) and provide supporting documents (detailed invoices, installation photos, serial numbers) when the system meets the criteria.

What this achievement demonstrates

• Technical rigor : high vacuum, leak tests, compliance with clearances.

• Facade finish : alignment of condensers, visible galvanized and anti-vibration brackets .

• Climate thinking : height adapted to the snow, defrosting management, short journeys.

• Support : operating advice, HVAC maintenance and assistance with paperwork when the devices are eligible.

Conclusion

This installation of two Gree wall-mounted heat pumps (R-32) in Rosemont–La Petite-Patrie illustrates how AirGreen designs projects for Montreal plexes: energy efficiency , aesthetics , and long-term reliability . By opting for two independent systems, owners benefit from precise control per unit , consistent performance , and simplified maintenance —all ready to face the Greater Montreal climate.