Installation of a Sharp ZU1 wall-mounted heat pump in Plateau-Mont-Royal

A recent indoor head with A2L refrigerant for precise, discreet and eco-efficient comfort in a Montreal condo

Project context and objectives

In a condo in Plateau-Mont-Royal , we are modernizing comfort with a Sharp ZU1 series wall-mounted heat pump operating with a new generation A2L refrigerant. The mandate is clear: to obtain stable heating in winter, fine cooling in summer, clean visual integration and minimal noise levels to respect the co-ownership lifestyle. We organize the HVAC installation to limit visible perforations, preserve aesthetics and maximize performance over four seasons in Montreal .

Why Sharp's ZU1 range for this condo?

The Sharp ZU1 is a recent generation using low GWP A2L refrigerant and inverter technology . This results in:

• precise power modulation to match the actual room load;

• excellent energy efficiency and long, smooth cycles;

• an operating range designed for the extreme cold of Greater Montreal;

• a compact, quiet design adapted to the typical ceiling heights of condos.

AirGreen Approach : We size BTU capacity based on actual room heat loss, solar orientation, glazing, and airtightness. The goal is not to add BTUs "just to be safe," but to achieve the perfect balance between comfort and consumption.

Implantation of the inner head: precision and compliance with clearances

The wall-mounted fan is installed high under the ceiling to promote controlled air stratification and diffusion throughout the living area. We comply with:

• the top and side clearances prescribed by the manufacturer to prevent any recirculation;

• rigorous alignment with the load-bearing wall, so as to limit vibrations;

• a rear path of the connections for a clean finish in the room.

The motorized shutter is set for a wide vertical sweep in cooling mode and a gentle throw in heating mode, to avoid drafts in the occupied area. The filters are accessible without removing the facade, which facilitates periodic HVAC maintenance by the occupant.

Refrigeration, electrical and condensate connections: an optimized route

For the technical part, we are setting up a short and streamlined route :

• Continuously insulated copper refrigeration lines , capped to the outside exit point;

• Bending radii respected on the bend to protect the copper core;

• Communication and power wiring in a dedicated conduit, with circuit breaker in accordance with the nameplate and electrical code;

• Condensate drainage primarily by gravity with a regular slope; if the architecture requires it, integration of a silent lifting pump , accessible tray and non-return valve.

Good practice in condos : the route must limit the crossing of spacers and noise-sensitive areas. Our team favors existing technical walls and short paths , guaranteeing long-term reliability and minimal pressure losses.

Drilling and sealing of the envelope

The main drilling is made to the adjusted diameter , with a sheath , low-expansion foam and a membrane for air/vapor barrier continuity. On the exterior, the capping is chosen in white to blend in with the light facades and the joinery of the condo. Each joint receives a polyurethane sealant resistant to UV and freeze/thaw.

Commissioning: instrumented controls and traceability

Commissioning follows a strict protocol:

1. Nitrogen test with stabilization and survey;

2. Deep vacuum draw , followed by a lift test ;

3. Load opening and verification of subcooling/superheating under real conditions;

4. Electrical checks (continuity, tightening, currents);

5. Setting up instructions and nighttime silent mode;

6. Delivery of a commissioning sheet (serial numbers, measurements, key photos) useful for the warranty and subsidies when applicable.

Results obtained after adjustments

From the first cycles, the temperature stabilizes quickly with minimal noise . The blowing is uniform, without disturbing air currents in the dining area. In heating mode, the inverter control maintains a regular comfort curve and limits humidity variations. The consumption measured in mid-season is significantly lower than with traditional electric baseboard heaters.

HVAC Maintenance: Actions That Prolong Performance

To maintain the performance of the wall-mounted heat pump , we recommend:

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

• Annual inspection by our technicians: electrical tightening, condition of insulation, cleanliness of coils, verification of load by indirect measurements and reading of currents;

• Control of free flow of condensates (slope, siphon, pump if applicable);

• Checking the remote control and resetting seasonal time slots .

AirGreen Tip : A clogged filter increases consumption and reduces heating capacity in cold weather. Simple, regular maintenance ensures consistent comfort and extends the life of your equipment.

A2L Grants, Compliance and Security

Recent high-efficiency heat pumps using A2L refrigerant may be eligible for financial assistance when they meet performance and installation criteria. We support our customers in:

• eligibility verification (model, climate zones, photographic evidence);

• preparation of files (detailed quote, serial numbers, standardized invoice);

• monitoring of requests until payment.

In terms of safety, the installation complies with the prescribed ventilation distances , the absence of nearby ignition sources and the use of A2L compatible components. Our teams are trained in A2L good practices for soldering, evacuation and recovery of fluids.

Key points addressed on this project

• Precise sizing : capacity adapted to the part avoiding short cycles;

• Short path of connections to limit losses;

• Compliant blowing and suction clearances ;

• Clean finishes (hoods, seals, alignments) for discreet integration;

• Optimized noise level thanks to night mode and the anti-vibration support of the associated outdoor unit.

Usage tips for the owner

• Use stable settings (heating/cooling) rather than frequent variations;

• Activate dehumidification mode on humid summer days;

• Keep obstacles away from the air outlet and return air;

• Program silent mode for nighttime hours if necessary;

• Schedule annual maintenance in spring or early fall to prepare for the following season.

AirGreen Service in Greater Montreal

We respond quickly to Montreal , Laval , Longueuil , as well as the North Shore and the South Shore . Our team manages the entire cycle: audit , equipment selection , HVAC installation , commissioning , HVAC maintenance and priority troubleshooting for our contracted customers.

Balance sheet

The installation of this Sharp ZU1 in a condo in Plateau-Mont-Royal illustrates our way of working: pragmatic engineering , careful finishing, strict compliance with A2L standards and complete support for performance and durability . The result: precise comfort, better controlled bills and aesthetic integration in line with co-ownership requirements.