Installation of a Gree Livo R32 wall-mounted heat pump in Rosemont–La Petite-Patrie

Tailor-made comfort in a Plateau plex, without compromising on aesthetics or performance in the Montreal climate.

Project context and client objectives

At AirGreen , we are working in a typical Plateau-Mont-Royal apartment: bright rooms, high ceilings, deep windows, dark walls and electric baseboard heating. The client wants:

• effectively cool an office/bedroom exposed to the afternoon sun;

• reduce the use of baseboards in mid-season;

• preserve a minimalist aesthetic (no visible wiring);

• benefit from a sustainable system, compatible with the extreme cold of Greater Montreal .

We offer a Gree wall-mounted heat pump operating with R-32 refrigerant, in 9,000 BTU/h format — sizing consistent with the observed surface area and insulation, while prioritizing low consumption and acoustic discretion.

Why Gree R-32 for this type of room

• High Seasonal Efficiency : Gree's new generation R-32 units offer very good heating and cooling efficiencies, with a reduction in GWP compared to R-410A.

• Extreme cold : capacity maintained below -20°C, ideal for Montreal , Laval , Longueuil , North Shore and South Shore where cold waves are frequent.

• Quiet : The interior head placed at the top of the wall near the ceiling operates at a low noise level – an asset for a workspace.

• Precise comfort : motorized shutter and fine temperature control to limit stratification near high ceilings.

Inner Head Implantation: Precision and Visual Integration

The room has a dark wall adjacent to a large window. We place the wall header at the top, approximately 2.40 m from the floor, on the exterior wall, to:

• sweep the air along the ceiling and then let it fall back down evenly;

• benefit from a short wall crossing to the backyard for refrigerant connections;

• avoid direct solar input from the bay window;

• keep the curtain rod clear.

The existing pendant light is retained: we check the safety distances and the free movement of the shutter to prevent any disruption to the air flow.

Route of connections and finishes (zero visible cables)

To preserve aesthetics, we opt for:

• a wall crossing behind the head, with 65 mm core drilling, adequate slope for evacuation;

• discreet capping matching the dark wall for the short section visible at the foot of the partition (mechanical protection of the connections and the drain);

• a length of lines of approximately 3 to 4 m (round trip), continuous closed-cell insulation and careful taping;

• a protected and channeled power cable to the dedicated circuit breaker, in accordance with the Quebec electrical code.

The result: a minimalist rendering, without visible beams, perfectly aligned with the interior design.

Condensate management: safety and cleanliness

We favor gravity drainage to the outside, with a controlled slope and non-return siphon. This solution:

• limits maintenance (no pump);

• eliminates the risk of additional noise;

• prevents backflow during thaws.

When the architecture requires a rising drain, we integrate a silent mini-pump; here, direct evacuation was chosen.

Outdoor unit: winter performance and durability

The outdoor unit is installed in the backyard, on galvanized wall brackets , approximately 18 inches above the ground to clear snow. We:

• ensure clearance on all four sides and above for airflow;

• let's put anti-vibration pads ;

• provide the defrost path and free flow;

• We offer an optional snow guard when roof exposure requires it.

This configuration limits the transmission of vibrations to the masonry and protects the compressor from ice accumulations.

Key steps in HVAC installation

1. Electrical check and allocation of a dedicated circuit (rating according to the nameplate).

2. Drilling with light fruit for the drain, air barrier sleeve and peripheral vapor barrier .

3. Line routing , controlled bending, brazing under nitrogen and nitrogen leak testing.

4. High vacuum to the micron, stabilization, then opening of the valves.

5. Power up , configuration and functional tests (heating and air conditioning).

6. Finishing : capping, exterior sealing, touch-ups and cleaning.

7. Transfer of advice : maintenance, adjustments, energy savings.

Measured result

• Target temperature reached quickly (drop of 2–3°C in less than 20 min in summer in the test room).

• Significant reduction in the use of baseboards during the off-season thanks to the heat pump heating mode.

• Uniform comfort without any drafts felt at the workstation.

Tips for use for lasting comfort

• Louver Orientation : Direct the flow toward the ceiling for gentle mixing in rooms with high ceilings.

• Dehumidification mode on muggy days to maintain comfort without overcooling.

• Programming : time slots adapted to routines (day/night), in particular to avoid over-solicitation when getting up.

• HVAC maintenance : cleaning of filters every 4 to 6 weeks in summer; annual professional inspection (pressure switches, connections, condensates).

AirGreen technical points and best practices

• Airtightness of the crossing (better for the envelope and against external noise pollution).

• Curvature radius respected to preserve the refrigerant charge and efficiency .

• Acoustic management : choice of supports and torque tightening to eliminate parasitic vibrations.

• Grant compatibility : High-efficiency wall-mounted heat pumps with R-32 refrigerant are generally eligible for financial assistance depending on current programs and performance criteria (we support our customers to verify eligibility).

What this achievement brings to the buildings of Greater Montreal

This approach is perfectly suited to plexes and condos in Montreal , but also to houses in Laval , Longueuil , the North Shore and the South Shore :

• clean and fast work in finished spaces;

• design-friendly integration with harmonized capping ;

• reliable winter performance without oversizing;

• simplified maintenance and optimized operating costs.

Mistakes to avoid (feedback)

• Oversize capacity: short cycles, premature wear, poorly managed humidity;

• Forgetting the drain slope : risk of overflow;

• Leaning the outdoor unit too close to the ground: snow accumulation and icing;

• Increase the number of tight bends : pressure losses and reduced efficiency.

And after?

We provide follow-up services : static pressure checks, parameter updates, and maintenance reminders. Our goal remains constant: to combine energy efficiency with respect for interior aesthetics, for lasting comfort in Plateau-Mont-Royal and throughout Greater Montreal.