Installation of a Sharp wall-mounted heat pump in Rosemont–La Petite-Patrie

Four-season comfort, discreet and impeccably integrated into a Rosemont plex

Project background

In Rosemont–La Petite-Patrie, we were commissioned to modernize the comfort of a typical Montreal plex. The goal: to provide efficient heating in the winter and stable cooling in the summer, while maintaining minimal noise levels and a neat aesthetic. We recommended a latest-generationSharp wall-mounted heat pump with R-32 (A2L) refrigerant, chosen for its performance in cold climates, its reliability, and its compact design that blends naturally into the bright interiors of the area's buildings.

Why the Sharp wall-mounted heat pump here?

• Cold climate efficiency : the new Sharp R-32 series maintains excellent COP and good capacity down to negative temperatures, meeting the needs of Greater Montreal .

• Quiet and comfortable : the interior head operates at a low noise level, an advantage for open living spaces.

• R-32 (A2L) : reduced charge, better GWP than R-410A and optimized thermodynamic performance.

• Reliability : precise electronics, well-managed defrosting, compatibility with the most common residential HVAC installations.

Key steps in HVAC installation

Analysis and sizing

Before any installation, we carry out a load calculation taking into account:

• orientation and sunlight;

• insulation (windows, walls, roof);

• the actual volume of the area to be treated (living room open to dining room, adjacent corridor, etc.);

• air infiltrations specific to Rosemont plexes.

This step guarantees an adapted capacity (common range for this type of living area: 12 to 15 kBTU depending on the envelope and the opening of the rooms), avoiding undersizing or short cycles.

Implantation of the inner head

We positioned the head at the highest point of the wall , at an angle , to optimize:

• stratification and air sweeping along the entire length of the room;

• gentle diffusion in heating mode, which limits cold areas on the floor;

• recovery of return air without immediate recirculation.

The top and side clearance is respected to ensure easy access to the filter and good reading of the probes.

Drilling and refrigeration connections

• Direct wall-exterior crossing , with limited drilling and white capping to match the interior wall;

• Insulated refrigerant lines, vapor barrier tapes at sensitive points;

• Communication cable protected in the same conduit for a clean finish and easy maintenance.

The path was designed to be short and straight , reducing pressure losses and helping the compressor operate in its optimal efficiency zone.

Condensate management

We have chosen a gravity evacuation with a continuous slope towards the outside. This solution:

• eliminates the noise and additional maintenance of a condensate pump ;

• limits the risk of overflow;

• prevents odors by ensuring regular drainage.

When gravity is not possible (interior stairwell, long distance, structural obstacles), we offer a silent pump with an overflow tray. Here, the plex configuration allowed for direct drainage , ideal for long-term reliability.

Outdoor unit and supports (courtyard side)

Even though the photo shows the inside header, our standard applies to the court side:

• Galvanized steel wall support or slab depending on the facade;

• Ground clearance for snow and winter air circulation;

• Snow guard if necessary and protective awning without obstructing the intake/insufflation;

• Position away from windows and passageways to minimize sound transmission to neighbors.

Result: stable comfort, controlled consumption

Smart space heater

In mid-season and during moderate cold weather, the heat pump significantly reduces the need for electrical backup. In a well-maintained Rosemont complex, savings can be substantial compared to resistive heating alone, thanks to a COP often higher than 2 in real-life conditions.

Uniform cooling in summer

Automatic horizontal sweeping and modulated fan speed distribute fresh air without drafts. The dehumidification function improves comfort during the humid periods typical of July and August in Montreal .

Silence and air quality

The Sharp head features easy-to-access washable filters . The low noise level allows for use in living areas, both day and night.

Technical points that make the difference

Refrigerant R-32 (A2L)

• Performance : better volumetric capacity, more efficient heat exchange;

• Environment : Lower GWP than R-410A;

• Safety : compliance with A2L good installation practices (ventilation, torque tightening, leak detection with nitrogen and soap, deep vacuum test).

Rigorous commissioning

Our technicians carry out:

1. Flare /fittings to manufacturer's recommended torque ;

2. Nitrogen test (pressure test) followed by deep vacuum ;

3. Leakage check and control of evaporation/condensation temperatures in operation;

4. Comfort parameter settings (ventilation, shutter angles, auto/silent modes).

Electrical integration

• Dedicated circuit breaker according to nameplate;

• Compliant wiring , protective sheath, clean routing to the panel;

• Emergency stop easily accessible near the outdoor unit.

HVAC Maintenance: Maintaining Performance

What we recommend to the client

• Clean filters every 4 to 8 weeks during periods of heavy use;

• Keeping the gutter and drain free;

• Clearing snow and ice around the outdoor unit in winter;

• Annual AirGreen inspection : inspection of the refrigeration cycle, pressure/temperature measurement, deep cleaning of the evaporator and condenser.

Regular maintenance maintains efficiency, extends compressor life and preserves the manufacturer/installation warranty .

Grants and eligibilities (general benchmarks)

High-performance R-32 wall-mounted heat pumps capable of maintaining capacities at −25°C/−30°C are generally eligible for certain assistance programs in Quebec. Eligibility depends on the exact model, certified performance, and building location. We support our clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore to validate the criteria and prepare the necessary documents.

AirGreen Tips for a Successful Project

1) Think about the route of the connections

The shorter and more direct the connections, the better the performance and visual discretion. We favor cappings that match the wall for a minimalist look.

2) Choose the blowing area

For heating, aim for the depth of the room ; for air conditioning, avoid direct blowing onto areas of prolonged occupation (sofa, dining table). The high corner placement used here is an excellent compromise.

3) Preserve access for maintenance

Leave the required clearances around the indoor head and provide a safe space around the outdoor unit for seasonal cleaning.

4) Think long term

Quality equipment deserves careful commissioning and annual maintenance . This is the recipe for stable comfort, controlled bills, and a longer lifespan.

What the customer gains today

• Quiet and consistent four-season comfort ;

• An eco-efficient solution adapted to Montreal’s climate;

• A clean and reversible installation, respectful of the aesthetics of the accommodation;

• AirGreen support: advice, maintenance, monitoring and support for assistance programs when applicable.

AirGreen, your HVAC partner in Greater Montreal

Whether you are in Rosemont–La Petite-Patrie , Laval , Longueuil , on the North Shore or the South Shore , our team is proficient in Sharp wall-mounted heat pumps , as well as Gree , Fujitsu , Midea , Hitachi and other well-known brands. We operate with constant high standards: precise diagnosis , careful installation , calibrated commissioning and clear maintenance follow-up . Your comfort is not a coincidence: it is a method.

Frequently asked questions

• Equipment type : Sharp wall-mounted heat pump , R-32 (A2L) refrigerant

• Installation : interior head at the top of the wall , angle for optimal scanning

• Connections : short trajectory, white capping , pressure test + deep vacuum

• Condensates : gravity evacuation (priority)

• Maintenance : regular filters + annual AirGreen visit

Ready for your project?

We schedule a technical visit, confirm the ideal capacity and propose a turnkey HVAC installation, designed for the climate of Montreal and its surrounding areas.

AirGreen – Attention to detail for your comfort.