Installation of a Gree (R-32 wall-mounted heat pump) in Rosemont–La Petite-Patrie

Four-season comfort, energy efficiency and careful finishing in a typical Rosemont apartment

Client context and objectives

At AirGreen , we are working on a bright home in the Rosemont–La Petite-Patrie sector of Montreal . The owner wants a compact and efficient HVAC solution to cool in the summer, moderate the shoulder seasons and support supplemental heating in the winter, without invasive work. We recommend installing a latest-generation Gree wall-mounted heat pump with R-32 refrigerant , sized for an open living space of approximately 35–45 m² (typical profile 12,000 BTU).

Why Gree in R-32 for this project

• High energy efficiency : R-32 provides better seasonal efficiencies and a reduced refrigerant charge compared to older generations of R-410A.

• Extreme cold : recent Gree ranges offer stable operation down to -25°C , or even -30°C depending on the series; ideal for the Montreal climate.

• Quiet and comfortable : the interior head provides discreet ventilation and even diffusion thanks to the motorized fins and wide blowing profile.

• Potential eligibility for assistance programs when Energy Star and low temperature performance criteria are met (to be validated on a case-by-case basis for Montreal, Laval, Longueuil, North Shore, South Shore ).

Sizing and capacity selection

We prioritize precise sizing, based on the envelope, orientation and uses:

• 9,000–12,000 BTU : Open bedrooms and living rooms up to ~40 m².

• 18,000 BTU : Larger living areas or unfavorable orientation.

• In the case of multiple zones, a MultiZone heat pump may be recommended; here, a single wall head meets the need.

Installation details — clean, short, and gravity-based

• Positioning : interior head placed high, centered on the load-bearing wall for optimal diffusion and to free up circulation.

• Single hole (~65 mm) with sealed bulkhead ; refrigerant connections, drain and supply pass directly through the rear of the unit (so-called “back-to-back” configuration).

• Condensate drainage : gravity , avoiding the pump and reducing maintenance.

• Short exterior route (estimated 1.5 to 2.5 m), limiting pressure losses and improving aesthetics.

• Finish : discreet capping on the outside, stainless steel fixings, insulated collars, UV tape; inside, no visible trunking, for neat integration .

• Power supply : dedicated circuit according to the rating required by the nameplate; circuit breaker and cable section comply with the Quebec Building Code.

Key stages of the project

1. Protection and marking : tarpaulins, laser markings to ensure the horizontality of the supports.

2. Drilling and sealing : draining angle towards the outside to prevent any water return.

3. Installing the plate and hanging the wall head; checking the alignment of the shutters.

4. Bending and flaring of copper tubes, brazing prohibited on the visible interior portion; torques on the dynamometer .

5. Deep vacuum (< 500 microns) and nitrogen leak test .

6. Commissioning : checking intensities, supply/return temperatures, and setting modes (cooling/heating, dehumidification).

7. Customer discount : explanations of use, HVAC maintenance settings, digital maintenance log.

Result obtained

• Rapid temperature reduction in summer with uniform blowing throughout the room.

• Comfortable maintenance during the off-season, reducing the need for the main heating system.

• Controlled acoustics : very low noise level at low speeds, ideal for teleworking.

• Aesthetics : no visible interior chute, clean wall facade.

Recommended HVAC maintenance

• Filters : Rinse every 4–8 weeks during periods of heavy use.

• Indoor battery : professional cleaning and annual mild biocide treatment .

• Outdoor condenser : clear leaves/snow, wash the exchanger in spring.

• Annual inspection by our technicians: pressure check, fittings, insulation, drain and parameter updates.

Tips for maximizing savings

• Maintain a stable setpoint (e.g. 23–24°C in summer) to avoid short cycles.

• Use the dehumidification mode when the air is heavy: the feeling of comfort increases without overcooling.

• Program the shutters to avoid direct blowing onto living areas.

• In winter, activate the extreme cold function when available; automatic defrosting managed by the unit.

Things to watch out for in Rosemont apartments

• Masonry walls : careful drilling and sealing to avoid water bridges and preserve insulation.

• Narrow backyards : choose a well-ventilated outdoor location that is clear of snow.

• Structure-borne noise : interposition of silent blocks and compliance with tightening torques to eliminate any transmitted vibration.

Why entrust your HVAC installation to AirGreen?

• Dimensioning engineering adapted to Montreal buildings.

• Certified technicians and commissioning tools (vacuum, micron meter, nitrogen).

• Responsive after-sales service , HVAC maintenance contracts and seasonal optimization advice.

• Grant support : we check the eligibility of models and files for Montreal, Laval, Longueuil, North Shore, South Shore .

Summary technical sheet (example of configuration installed)

• Type : single-zone wall-mounted heat pump .

• Brand : Gree (recent R-32 platform).

• Typical capacity : 12,000 BTU.

• Operating range : up to −25°C (depending on the series).

• Power supply : 208–230 V, dedicated circuit.

• Installation : rear drilling, gravity drain , short connections, discreet finish.

Are you considering a similar HVAC installation in Montreal or the surrounding area? Our team will guide you from sizing to commissioning , with clean and sustainable execution.