Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie (Montreal)

Four-season comfort for a garden-level home: impeccably integrated interior installation

At AirGreen , we have just installed a Sharp wall-mounted heat pump – ZU1 range (R-32) in a Rosemont–La Petite-Patrie home. The project is taking place in a garden level/basement type room, with painted block walls and moderate ceiling height . Our mandate: to provide reliable heating in winter and precise air conditioning in summer , while integrating the indoor unit with discretion and technical rigor to preserve the aesthetics of the place and performance over time.

Why a Sharp ZU1 (R-32) wall-mounted heat pump in this context?

The Sharp ZU1 range is particularly well suited to Montreal apartments:

• R-32 refrigerant : improved efficiency and reduced global warming potential compared to R-410A.

• Inverter technology : continuous modulation to maintain a stable temperature without overconsumption.

• Low noise level : ideal for living rooms and bedrooms located near the unit.

• Capacity range from 12k to 24k BTU : allows precise sizing according to insulation, sunlight and room use.

• Comfort functions : optimized defrosting, night mode, automatic restart after power cut.

In this accommodation, the choice of a wall unit meets a need for localized comfort : the room serves as both a living room and a workspace, with variable internal loads (IT equipment, intermittent occupancy). The fine modulation of the ZU1 makes it possible to limit temperature variations and reduce operating costs .

Preliminary study and preparation of the installation

Each AirGreen installation begins with a technical validation :

1. Survey of dimensions and clearances around the proposed wall, with verification of the absence of obstacles (lintels, ducts, cables).

2. Choice of location : the interior head is centered in the upper part of the wall , at a sufficient distance from the ceiling to allow air suction and avoid hot/cold recirculation.

3. Route of connections : selection of a route as straight as possible towards the outside, in order to reduce pressure losses and facilitate maintenance .

4. Drainage plan : confirmation of gravity flow with continuous outward slope to evacuate summer condensates.

Fixing and leveling the wall plate

We anchor the mounting plate to the block wall using suitable dowels and a laser level . This point is crucial: a slight controlled slope prevents water from accumulating in the inner head tray and eliminates the risk of droplets on the facade.

• Tightening torque respected according to the manufacturer's instructions.

• Spacers if necessary to compensate for any wall outages.

• Connection passage drilled with clean core and chamfered on the inside to protect the pipe insulation.

Drilling, crossing and sealing

The through hole is made with a controlled exit slope . We install:

• a protective sleeve for the refrigeration connections and the communication cable;

• a vapor barrier on the interior side to preserve the airtightness of the envelope;

• a finishing polymer sealant to prevent any infiltration of air or moisture.

On the outside, the connections are capped up to the condenser in order to protect the insulation against UV rays and bad weather and to obtain a clear visual signature on the facade.

Refrigeration connections and commissioning

Our technicians carry out calibrated flaring with torque control and installation of rings if required. Commissioning follows a strict protocol:

• Deep vacuum until stabilization, check for possible micro-leaks.

• Release of R-32 contained in the outdoor unit.

• Functional tests in heating and cooling modes, control of supply temperatures , superheating/subcooling and intensity .

• Adjusted fan settings to limit air movement felt in the living area.

Power and Communication: Safety and Compliance

The indoor unit is powered and controlled from the outdoor unit via protected communication wiring . In accordance with the Quebec Electrical Code , the outdoor unit has an accessible disconnect device for maintenance. All wiring is secured and identified , facilitating future interventions.

Aesthetic integration into a room with block walls

The “garden level” context brings two challenges: ceiling height and textured wall surface . We respond to this by:

• a centered installation that promotes uniform air diffusion ;

• precise alignment with the visual joints of the wall for a clean reading of the whole;

• discreet management of the trapdoor cable and removable elements for maintenance.

The result: a visually sober interior unit , perfectly consistent with the simple architecture of the room.

Measurable comfort, tangible savings

In operation, the Sharp ZU1 provides:

• stable blowing without aggressive air currents thanks to adjustable flaps and fine fan speeds;

• appreciable responsiveness to changes in occupancy (arrival/departure of occupants, cooking, computer devices);

• substantial energy savings compared to traditional window units and electric convectors.

Combined with good airtightness of the home and reasonable setting habits , the heat pump allows you to reduce the bill while improving the quality of the air through filtered circulation.

Good practices for use and maintenance

To maintain performance over time, we provide the customer with an AirGreen user guide and recommend:

1. Clean the inner head filters every 4 to 8 weeks during the season.

2. Schedule an annual inspection : cleaning the exchanger, checking the connections, insulation testing, checking the refrigeration parameters.

3. Maintain clearances around the unit and clear any shelves or curtains that could obstruct air intake.

4. Adjust the shutters to avoid blowing directly onto workstations or the sofa area.

5. Monitor the drain when it is restarted in spring: any sign of abnormal flow should lead to a check of the slope or the tank .

AirGreen offers maintenance plans tailored to apartments, plexes and condominiums in Greater Montreal to ensure lasting performance .

Specific challenges of the construction site and solutions provided

• Support on block walls : choice of suitable anchors and controlled tightening to avoid micro-vibrations and paint peeling.

• Limited ceiling height : installation low enough to allow the upper intake to breathe , while remaining out of the direct field of vision.

• Neat crossing : continuous slope of the gravity drain and clean finish around the interior rosette.

These decisions guarantee quiet operation , reliable condensate drainage and neat aesthetics .

Grants and Eligibility

High-efficiency R-32 heat pumps like the Sharp ZU1 range are generally eligible for energy efficiency assistance programs in Quebec. Our team assists with the preparation of the technical file (BTU capacity, performance sheets, proof of commissioning) and advises on the eligibility criteria for residences in Montreal, Laval, Longueuil, North Shore and South Shore .

Why entrust your HVAC installation to AirGreen?

• Local expertise in Montreal housing (plexes, basements, block walls and brick facades).

• Standardized procedures : high vacuum, testing, quality control and installation report submitted to the customer.

• Aesthetics and durability : discreet hood, watertight crossings, short paths to maintain efficiency.

• Responsive after-sales service : preventive maintenance, original parts and operating advice.

Are you considering a wall-mounted heat pump for your apartment or complex? We size, install, and maintain systems from Sharp, Gree, Fujitsu, Midea , and several other brands throughout Greater Montreal .