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

Precise comfort, silence and careful diffusion under the ceiling: a Sharp wall head perfectly integrated into an apartment in the Plateau

At AirGreen , we have just completed the installation of a Sharp wall-mounted heat pump ( ZU1 range, R-32 refrigerant) in a typical Plateau-Mont-Royal apartment. The client's objective was clear: to optimize the heating and cooling of a large living room located under a close ceiling, without compromising on aesthetics or noise levels . The Sharp indoor head we installed meets these requirements thanks to its Inverter technology , precise air treatment and high-efficiency filters.

Context of the locations and choice of location

The apartment has a common configuration for Montreal plexes: longitudinal room, limited usable height near the ceiling, transverse circulation. We positioned the unit at the top of the wall , as close as possible to the ceiling, to maximize stratification in heating mode and free up wall space. This placement ensures:

• even diffusion along the room, thanks to the motorized horizontal shutter ;

• the absence of direct blowing on the seating areas;

• a clean visual integration on the ochre-colored wall, the white bodywork emphasizing a clean finish.

The through-hole was made with a constant outward slope to allow gravity drainage of condensate—the most reliable and quiet solution when the architecture allows it. The refrigeration connections are run short and straight (estimated at 2 to 2.5 m ), limiting pressure losses. A white UV cover protects the insulation on the outside; inside, the passage is hidden behind the unit for a sleek aesthetic.

Why the Sharp ZU1 range for Plateau-Mont-Royal

• High efficiency inverter (R-32) : fine modulation of power to maintain the target temperature with controlled consumption .

• Quiet operation : the indoor unit is distinguished by a low noise level , ideal for teleworking and reading.

• Advanced air treatment : multi-stage filtration and Sharp's own Plasmacluster technology (reduction of particles and allergens), highly valued in urban housing sensitive to air quality.

• Performance in extreme cold : reliable heating during Montreal winters, avoiding the need for costly backups.

• Simple design : straight lines, discreet display, adjustable shutters to prevent drafts on the occupants.

Key steps in our HVAC installation

1. Load study and location
   Analysis of the envelope, internal contributions and use of the room. Target capacity ≈ 12,000 BTU/h retained in view of thermal gains/losses and the volume to be treated.

2. Installation of the plate and tracing
   Rigorous leveling to ensure gravity flow . Check clearances around the device to preserve air intake .

3. Controlled drilling and crossing
   Clean drilling with sealing sleeve ; outward slope for the drain. Edge protection to prevent micro-cracking of the coating.

4. Routing of refrigeration connections
   Continuously insulated annealed copper, controlled bend radii and abrasion-resistant collars. Service loop left near the condenser to simplify future work.

5. Connection, vacuuming and controls
   Deep vacuum , leak test, overheating/subcooling control, blowing temperature and flow measurement.

6. Calibration and commissioning
   Setting of seasonal modes and sweeping ; initial instructions explained to the customer (winter 20–21°C , summer 22–23°C to optimize comfort and bill).

Execution details visible on the project

• Compact wall head mounted on the ceiling, side lights and uniform front for clean integration on the colored wall.

• Wide supply louver , adjusted to fit the ceiling and project air far without direct draft.

• Secure gravity drain , external outlet protected against frost; no pump required, therefore zero additional noise .

• Short, protected connections ; careful sealing at the crossings to prevent any entry of parasitic air.

Results obtained

• Rapid temperature rise in winter and stability without marked on/off cycles.

• In summer, precise air conditioning with reduced humidity during peaks.

• Silent operation allows the living room to be used as a workspace.

• Improved air quality and a softer feeling of freshness thanks to ceiling diffusion.

Recommended HVAC maintenance

• Filters : cleaning/vacuuming every 4 to 8 weeks (more frequent if there are animals or dust).

• Outdoor condenser : 45–60 cm clearance all around; clear snow and leaves.

• Annual AirGreen visit : check of pressures , exchanger efficiency , drain , flaps and update of settings.

• Best practices : avoid extreme setpoint deviations; use Dry mode in humid mid-season; keep interior doors open for even distribution .

Pitfalls to avoid in similar accommodations

• Undersizing in long parts: favor precise sizing to avoid constant full load operation.

• Siphon paths for the drain: risk of stagnation and odors; a continuous slope is essential.

• External supports too low : exposure to snow and ice; provide raised support or wall brackets .

• Dark capping on a light facade : prefer a UV-resistant white capping for discretion and durability.

Grants and support

Thanks to its high efficiency and its capacity for heating in extreme cold , the Sharp ZU1 range is generally eligible for grant programs for heat pumps in Quebec. We support our customers in Montreal , Laval , Longueuil , North Shore and South Shore for the preparation of parts and validation of eligibility .

Why team up with AirGreen?

Our approach combines rigorous sizing , careful execution and after-sales service . In the Plateau-Mont-Royal, this installation illustrates our ability to exploit ceiling constraints , to take care of invisible details (slopes, waterproofing, equivalent lengths) and to deliver discreet and lasting four-season comfort .

Project sheet — summary

• Location : Plateau-Mont-Royal (Montreal)

• Type : wall-mounted heat pump

• Brand : Sharp — ZU1 range (R-32, Inverter)

• Interior : high installation, ceiling diffusion , gravity drain

• Estimated route : ≈ 2–2.5 m of connections, direct crossing

• Advantages : silence , energy efficiency , improved air quality , neat aesthetics

• Maintenance : regular filters + annual AirGreen inspection

In summary, the Sharp wall-mounted heat pump (ZU1 range) installed in Plateau-Mont-Royal offers very comfortable diffusion , controlled consumption and a discreet finish perfectly suited to Montreal interiors.