Installation of a Sharp ZU1 wall-mounted heat pump in Saint-Léonard

An HVAC installation designed for precision, discretion and comfort in an urban environment

Customer needs and residential context

In this Saint-Léonard plex, the occupant was looking for a compact heating/air conditioning solution for the main room adjoining a window. The objective: to maintain a stable temperature all year round , limit perceived noise and preserve the interior aesthetics without visible cable ducts. Our recommendation was a Sharp ZU1 wall-mounted heat pump (new generation R-32 ), perfectly suited to Montreal housing units for its low-temperature performance and its air filtration functions.

Why the Sharp ZU1 is right for Greater Montreal's climate

• Inverter compressor ensuring fine modulation and energy savings in air conditioning and heating .

• R-32 refrigerant with reduced GWP , compliant with current environmental guidelines.

• Cold weather heating capacity relevant for Montreal, Laval, Longueuil, North Shore, South Shore , with appreciable blowing consistency during freezing periods.

• Sharp's proprietary Plasmacluster technology contributes to healthier indoor air quality when windows are kept closed.

• Low noise level and regular blowing, crucial for living rooms and bedrooms in urban environments.

Choice of location: efficiency without compromising on aesthetics

The indoor unit is fixed high under the ceiling , near the window frame equipped with a box blind . This installation respects three essential principles:

1. Optimal air hydraulics : at height, the air blade deploys above the furniture and mixes properly before reaching the occupied area.

2. Clear air return : the space around the facade is not obstructed by curtains or shelves; the filters remain accessible for HVAC maintenance .

3. Visual integration : the white lacquered casing of the wall-mounted heat pump aligns with the ceiling for minimal visual impact.

The proximity of the window was deliberately maintained to limit the refrigeration lengths and shorten the crossing to the outside, while ensuring sufficient clearance from the curtains so as not to disrupt the blowing.

Refrigeration path, crossings and condensate management

We favor a short route behind the unit, with a service hole with a controlled slope towards the outside. The condensate drain operates by gravity , which eliminates the use of a lifting pump: less noise, less maintenance and less risk of overflow.
The copper lines and the communication cable are insulated and sealed at the crossing (vapor barrier ring, butyl sealant on the outside). On the outside, the connections are protected by UV- and impact-resistant capping , fitted tightly to the covering for a clean finish and increased winter protection .

AirGreen Methodology: A Risk-Free HVAC Installation

1. Sizing : calculation of load per room (volumes, orientation, infiltration) and validation with occupancy habits. Selection of a standard residential caliber (12 to 18 kBTU depending on the area to be treated).

2. Preparation : protection of surfaces, identification of networks, verification of the dedicated 240 V line and the circuit breaker on the panel.

3. Drilling : outward-facing escape angle, wall pass-through and fire-resistant foam.

4. Refrigeration assembly : brazing under nitrogen flushing when fittings need to be adapted, then pressurizing with dry nitrogen for leak testing.

5. Vacuum : Deep vacuum ≤ 500 microns, stabilized, to remove moisture and ensure oil and compressor longevity.

6. Load opening / commissioning : control of evaporation/condensation temperatures, superheating and subcooling , current measurement, tests in heating and air conditioning modes.

7. Comfort settings : shutter orientation, position memorization, eco time programming and usage tips.

8. Customer provided with : maintenance guide, clearance reminders for the outdoor unit and procedures to follow in case of extreme cold and defrosting .

Result on the field

The Sharp ZU1 ensures even diffusion , a contained noise level and a marked setpoint stability . The room benefits from horizontal airflow that does not hit the occupants or the curtains, while promoting efficient mixing. In warm weather, dehumidification is noticeable; in cold weather, the heat input is gradual and sustained.

Technical details and finishes that make the difference

• Fixing on plate with dowels adapted to the support; tightening torques controlled to avoid vibrations .

• Anti-vibration pads and control of possible parasitic noise (flap slamming, box resonance).

• Neatly channeled wiring , marked on the electrical panel, with circuit breaker identification for future maintenance.

• Sealing of crossings from the outside to prevent air infiltration and moisture bridges.

• Height designed to allow cleaning of filters without high stepladders and to protect the ceiling from hot flows.

HVAC Maintenance: Maintaining Performance and Air Quality

• Filters : rinse every 4 to 8 weeks depending on the presence of animals or frequent cooking.

• Evaporator and fan : periodic cleaning/disinfection to avoid odors and loss of flow.

• Drain : check the slope and clearance at the start of summer.

• Annual AirGreen inspection : electrical measurements, probe checks, defrost tests, validation of refrigeration parameters.

Grants and programs

Recent R-32 wall-mounted heat pumps generally meet the performance requirements of current programs in Quebec. Exact eligibility depends on capacity and performance; our team assists residents of Montreal, Laval, Longueuil, the North Shore, and the South Shore in preparing the necessary documents and certifications.

Advice on locating plexes and condominiums in Saint-Léonard

• Provide sufficient snow clearance around the outdoor condenser and keep it away from areas where ice falls.

• Avoid directing the blowing directly towards the curtains: the ZU1 allows precise adjustment of the shutters.

• Anticipate noise pollution from neighbors: anti-vibration mounts, fan orientation and choice of location limit transmission.

• Integrate condensate management from the design stage: a well-designed gravity drain simplifies life and reduces maintenance costs.

What this installation brings to the owner

• Four-season comfort in a versatile room.

• Controlled consumption thanks to inverter modulation and adapted settings.

• Interior finish without visible ducting, respecting the lines of the ceiling and the blind.

• Predictable maintenance with easy access to filters and crankcase.

AirGreen: local expertise, rigor and sustainable support

At AirGreen , we carry out HVAC installations throughout Greater Montreal , from sizing to documented commissioning , including maintenance . Our teams understand the constraints of Saint-Léonard plexes as well as the realities of Laval houses or Longueuil condos. Our promise: a clean site, consistent performance, and follow-up that protects your investment.

In summary - highlights of this construction site in Saint-Léonard

• Equipment : Sharp ZU1 wall-mounted heat pump , R-32 refrigerant.

• Location : high under ceiling, near a window, clear air return .

• Route : short crossing, gravity condensates , UV-protected exterior capping.

• Procedure : nitrogen pressure, deep vacuum , flap adjustments and eco programming.

• Benefits : silence , temperature stability , winter/summer efficiency and improved air quality .

Next step

For a similar project—single room, expansion to other areas, or MultiZone —we offer an on-site assessment , controlled deadlines , and personalized recommendations for Montreal, Laval, Longueuil, North Shore, South Shore . Annual HVAC maintenance can be integrated into commissioning to maintain performance and warranty.