Installation of a Sharp ZU1 series wall-mounted heat pump in Ahuntsic-Cartierville

Precise and discreet comfort in a bright room in the north of Montreal

At AirGreen , we prioritize HVAC installations that truly improve daily comfort while respecting the aesthetics of the rooms. This project in Ahuntsic-Cartierville involves a Sharp wall-mounted heat pump ( ZU1 series ), installed at the top of the wall, near a wooden framed window. The owner's goal is simple: stabilize the temperature of a very bright room, limit the differences between day and night and reduce energy consumption compared to electric convectors.

Context and objectives of the project

The client wants a quiet and responsive solution to ensure:

• a quick refreshment during Montreal's hot periods;

• reliable heating support during the off-season and in the middle of winter;

• careful integration without encroaching on the existing layout.

After taking measurements and surveying the glass surfaces, we selected a heat pump from the Sharp ZU1 family, sized in the 9,000–12,000 BTU range depending on the calculated heat load. This range offers fine inverter modulation, low noise levels and advanced air filtration, ideal for a bedroom.

Interior layout: uniform diffusion and preserved aesthetics

Positioning. The indoor unit is placed high up , on the side wall next to the window. This position allows the airflow to follow the ceiling and reach the entire room evenly, without direct airflow onto the bed. The unit maintains the recommended clearances for air extraction and maintenance.

Finishing. We carefully align the appliance horizontally with the ceiling molding and curtain rod to ensure its presence remains discreet. The Sharp's white facade blends in with the pale gray wall; no decorative accessories are added nearby to preserve air intake.

Route of connections and clean drilling

• Single rear drilling behind the mounting plate (Ø ≈ 65 mm), making the connections inside invisible.

• Short refrigeration line (approximately 2.5–3 m to the outside), which limits pressure losses and improves seasonal efficiency.

• Exterior capping matching the facade, mechanically fixed and sealed to prevent water and air infiltration.

• Bending radius and insulation thickness respected on copper tubes to prevent condensation points.

Condensate management: priority to gravity

The wall configuration allows for gravity drainage with a continuous slope of ≥ 2% towards the outside. We install a non-return valve and a discharge section out of reach of splashes. This approach avoids the use of a lift pump in a bedroom, which reduces noise levels and maintenance.

Power supply and compliance

• Dedicated 240V circuit to the panel, with circuit breaker calibrated according to the appliance plate.

• Outdoor disconnect box near the condenser, in accordance with the Quebec Electrical Code.

• Conductors, grounding and waterproof cable glands checked; routes fixed to eliminate vibrations.

Commissioning: our reliability protocol

1. High pressure nitrogen test and leak test (foam test and stability).

2. Deep vacuum ≤ 500 microns, maintenance then validation of stable rise, guarantee of a circuit free of humidity.

3. Torque tightening of flare fittings to Sharp specification.

4. Settings : calibration of shutters, ventilation speeds, night silence mode and automatic restart in the event of a power cut.

5. Final checks : blowing temperature, intensity, balancing of the shutters for a smooth sweep along the ceiling.

Results for the client

• Regular temperature at night, without localized over-cooling.

• Significant reduction in consumption thanks to inverter modulation and optimized refrigeration length.

• Quiet at low speed, suitable for bedroom use.

• Air quality enhanced by multi-stage filtration specific to the Sharp range.

Execution details that make the difference

• No visible chute inside; clean feedthrough on back of unit.

• Gravity drain with non-return valve, anti-freeze control and anti-vibration mounting.

• Discreet exterior capping , stainless steel screws and anti-UV seals.

• Respect the clearances around the rod and the curtain to avoid the suction of textiles and micro-noises.

Good practices for use in a bedroom

• Maintain a stable setpoint (20–22°C) rather than frequent variations.

• Orient the shutters in a wide sweep; avoid direct airflow onto the bedding.

• Activate dehumidification mode occasionally during summer humidity peaks.

• Leave free clearance around the unit; do not hang objects or shelves in the recovery axis.

HVAC Maintenance: Simple and Sustainable Plan

Regular HVAC maintenance extends longevity and maintains performance:

• Filters : Vacuum every 4–6 weeks; wash in warm water then dry thoroughly.

• Tray and drain : check the slope and rinse at the start of summer; no obstruction confirmed.

• Exchanger : annual professional cleaning to prevent lamellar fouling.

• Outdoor condenser : clearing of grilles in all seasons (snow, leaves); checking of anti-vibration pads.

• Annual AirGreen visit : supply/return thermometry, electrical check, intensity measurement, tightening and updating of parameters.

Capacity Selection: Our Sizing Method

We take into account:

• of the floor area and the actual volume under ceiling;

• the orientation and solar gains of the window;

• infiltrations and insulation level;

• internal loads (occupants, appliances, lighting).

This approach results in a capacity in the 9,000–12,000 BTU range for a typical bedroom size, with an airflow setting suitable for sleep. The goal is to avoid oversizing (stops/starts, noise) and undersizing (insufficient comfort in hot or cold weather).

Grants and Eligibility

High-performance, certified wall-mounted heat pumps may be eligible for current programs (e.g., LogisVert Hydro-Québec ). We assist our customers in selecting eligible models, providing proof of HVAC installation , and submitting documents in Greater Montreal , including Montreal , Laval , Longueuil , the North Shore , and the South Shore .

Safety and acoustics

• Reduced solid transmission thanks to anti-vibration fixings and compliance with tightening torques.

• Sound level controlled at minimum speed at night; settings recorded upon delivery to the customer.

• Electricity : Dedicated circuit, clear identification on the panel and labeling of the disconnect box.

Pitfalls to avoid in this type of room

• Subsequently drill the wall in the axis of the crossing without prior marking.

• Leave a curtain over the air intake, which disrupts the temperature measurement.

• Repeatedly turn off the power at the circuit breaker; instead, use the remote shutdown to preserve the electronics.

Why AirGreen for your HVAC projects in Greater Montreal

Our team designs, installs and maintains HVAC systems adapted to local climatic realities:

• Accurate diagnosis and clear recommendations;

• Careful execution : clean drilling, watertight seals, discreet exterior capping ;

• Planning that limits the impact on home life;

• Structured after-sales service and HVAC maintenance reminders;

• Coverage of all of Greater Montreal: Montreal , Laval , Longueuil , North Shore and South Shore .

Summary. This Sharp wall-mounted heat pump installation in Ahuntsic-Cartierville delivers consistent comfort, quiet operation, and a clean interior finish. Thanks to the short cooling path, gravity drain , and sleep-friendly settings, the room improves quality of life year-round, without compromising on aesthetics.