Installation of a Gree Inverter wall-mounted heat pump in Mercier–Hochelaga-Maisonneuve

A high and compact wall installation that respects Montreal brick

At AirGreen , we carry out HVAC installations that combine performance, discretion, and durability. In this project in Mercier–Hochelaga-Maisonneuve , we installed a Gree Inverter wall-mounted heat pump (mono-split) on galvanized brackets . The red brick home has a narrow courtyard and openings on the upper floor. The objective is clear: to provide stable, four-season comfort, free up the footprint, and take care with the finishing touches to preserve the building's character.

The outdoor unit is installed high up , under an upstairs window, to protect it from snow accumulations, impacts and dirt from passageways. The chassis rests on blue anti-vibration pads , visible at the ends of the rails, to cut off the transmission of vibrations to the masonry. The refrigerant connections exit neatly behind the unit, with an insulated service loop that absorbs thermal expansion and facilitates future work. A metal electrical conduit runs to the outdoor disconnect switch, ensuring immediate access and optimal safety for maintenance.

AirGreen Method: Measurable Performance, Safety, Finishes

Inverter efficiency and modulation

The Gree Inverter continuously adjusts the compressor speed. This modulation limits on/off cycles, stabilizes the indoor temperature, reduces consumption, and lowers noise levels in steady state. For a Montreal apartment or plex, this behavior ensures constant comfort in both air conditioning and supplemental heating.

Short and protected refrigeration path

The compact pipework (wall entry in the immediate vicinity of the unit) reduces pressure losses, improves thermodynamic efficiency, and simplifies maintenance operations. Continuous pipe insulation prevents condensation in summer and limits thermal bridges in winter. The holes are sealed with brick-compatible sealants to prevent water infiltration.

Fasteners and structural stability

• Heavy-duty wall brackets , pegged into the masonry and anchored in the joints to preserve the integrity of the bricks.

• Level and squareness controlled to ensure correct flow during defrosting and to avoid any twisting of the chassis.

• Stainless steel screws and lock washers for long-lasting resistance to freezing and thawing.

Electricity and intervention safety

The external disconnect switch is located within easy reach of the technician, complying with maintenance requirements. The dedicated circuit from the main panel is sized according to Gree specifications: conductor gauge, protection and grounding are verified. Clear circuit identification facilitates diagnostics and subsequent HVAC maintenance operations.

Rigorous commissioning

We apply a strict protocol:

1. Nitrogen leak test with pressure drop control.

2. Deep stable vacuum (microns), removing air and moisture.

3. Checking the tightening torques of the flared fittings.

4. Controlled start-up, amperage measurements, insufflation and recovery temperatures.

5. Validation of superheat/subcooling parameters to confirm actual performance.

Architectural context: urban alley, red brick and elevated access

Brick buildings in Montreal's inner city require careful placement. Here, the installation at height :

• clears the passage at ground level,

• keeps equipment away from splashing water and debris,

• reduces exposure to accidental acts,

• simplifies the maintenance of the surroundings and the facing.

The façade benefits from a neighboring vertical brown capping , which visually harmonizes with the brick. The positioning preserves air clearances around the exchanger, preventing recirculation that would harm heating and cooling performance. The alignment of the rails and the distribution of loads limit resonance zones, for quiet operation on the alley side.

Sizing, usage and advice to the owner

Capacity and load calculation

In this type of housing, the capacity chosen is frequently between 9,000 and 18,000 BTU/h , to be specified by a load calculation integrating insulation, orientation, glazed surface and air infiltration. This sizing determines the seasonal efficiency, comfort and longevity of the compressor.

Good usage practices

• Keep the area in front of the battery and under the unit clear .

• Clean the outdoor battery in spring and after pollen episodes.

• In winter, monitor the flow of defrost water to prevent ice from forming underneath.

• Schedule annual HVAC maintenance : check currents, tightening, condition of insulation, cleaning of the indoor unit.

Condensate management

The elevated installation facilitates the gravity flow of water to the outside during defrost cycles. The drip path is oriented so as not to wet the sills or traffic areas, which limits the risk of ice in periods of intense cold.

AirGreen finishes: visual cleanliness and durability

• Blue anti-vibration pads under the chassis to reduce structure-borne noise.

• Rigid metal conduit for power supply, better protected against impacts and UV rays than a flexible sheath.

• End caps and caps at the ends of the insulation to prevent damage from sunlight and birds.

• Caulked holes and shades match the brick.

• End of construction documentation: measured values, serial numbers, photos, instructions for use.

Grants and administrative support

High-efficiency wall-mounted heat pumps may be eligible for assistance based on seasonal performance and current program criteria. We assist homeowners in Montreal, Laval, Longueuil, the North Shore, and the South Shore with eligibility verification, document collection, and application submission to optimize the net cost of the project.

What the Mercier–Hochelaga-Maisonneuve customer gains

• A wall-mounted air conditioner and additional heater combined in a single unit.

• A robust, aligned, waterproof and easily accessible installation for maintenance.

• Noise controlled thanks to inverter modulation and anti-vibration devices.

• A preserved facade and a cleared ground passage, essential assets for Montreal's narrow alleys and courtyards.

Best practices for similar projects in Greater Montreal

1. Respect the clearances around the battery to avoid air recirculation.

2. Limit the length of refrigeration lines and maintain continuous insulation.

3. Take care of the anchoring in the masonry: preferably drill the joints, seal and protect.

4. Secure the power supply : dedicated circuit, accessible disconnect switch, clear marking.

5. Plan maintenance : periodic cleaning, parameter checks, inspection of capping and supports.

Conclusion

This Gree Inverter wall-mounted heat pump installation in Mercier–Hochelaga-Maisonneuve illustrates the AirGreen signature: compact design, clean finishes, secure access and performance confirmed upon commissioning. Our teams operate throughout Montreal, Laval, Longueuil, on the North Shore and the South Shore , with the same level of requirement: a clean site, stable comfort and a long-term investment protection.