Installation of a Sharp ZU1 wall-mounted heat pump in Plateau-Mont-Royal
AirGreen installed a Sharp ZU1 wall-mounted heat pump in Plateau-Mont-Royal: discreet integration under the drop, short path to the terrace, stable winter/summer comfort and R-32 efficiency. Expert HVAC service throughout Greater Montreal.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
An elegant and efficient integration into a Montreal apartment
At AirGreen , we have just completed the installation of a Sharp ZU1 wall-mounted heat pump in Plateau-Mont-Royal . The owners' goal: to achieve four-season comfort in a bright apartment with typical Montreal character—crownings, high windows, and access to a terrace—while preserving the aesthetics of the living areas.
The customer's need: comfort, simplicity and silence
In this open-plan accommodation (living room, reading corner and passage to the terrace), the air is easily stratified: hot in summer near the windows , cool in winter at ground level . The clients wanted:
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Reliable heating in winter and precise air conditioning in summer .
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A minimum noise level for reading and working peacefully.
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A discreet installation, respecting the interior architecture and circulation.
Why the Sharp ZU1 range is a must here
The Sharp ZU1 ticks all the boxes for an urban project:
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High efficiency with R-32 refrigerant, more efficient than older generations with R-410A.
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Extreme cold operating range , suitable for Montreal winters.
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Fine inverter modulation to stabilize temperature and reduce consumption.
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Careful air treatment and gentle diffusion, appreciated in relaxation areas.
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Small footprint and understated design that fits naturally above frames.
This range generally makes it possible to access subsidies when the efficiency criteria are met; we support our clients to verify eligibility according to the chosen capacity and the active programs in Quebec.
Interior installation: millimeter precision under ceiling drop
The positioning of the wall head has been studied to maximize air coverage without creating a direct current on the occupants:
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High installation under a ceiling drop , at the regulatory distance from the sides and the ceiling to guarantee optimal sweeping .
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Sufficient clearance from the window frame and the door to the terrace to avoid any recirculation of air .
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Support anchored to uprights, with laser leveling and anti-vibration pads to maintain silence.
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Addition of a discreet deflector (baffle) to soften the airflow directed towards the reading corner and avoid impact on the wall artwork.
Refrigeration route and management of invisible… but essential details
To ensure the installation remains visually simple and technically efficient , we have optimized each meter of line:
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Wall crossing to the outside on the terrace side, which limits the distance to approximately 2–3 m and reduces pressure losses.
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Capping matching the exterior coating, stainless steel screws and waterproof sealing to prevent any infiltration.
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Gravity drainage with controlled slope, insulated to prevent condensation on interior sections.
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Sheathed communication/control wiring and waterproof service box on the exterior side for simple and safe future maintenance.
Commissioning: AirGreen protocol
We apply a standardized procedure that makes a difference in the long term:
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Controlled flares and torques on the dynamometer.
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Deep vacuum with digital micro-manometer until stabilization.
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Leak test and pressure/temperature check according to manufacturer's tables.
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Airflow calibration and remote control settings (modes, setpoint ranges, economy functions).
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Usage review with occupants: good HVAC maintenance practices, filter cleaning and seasonal adjustments.
Concrete result for the occupants
From the first hours of use, owners noticed:
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Even cooling of the living room and passage areas, without “dead” zones.
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Responsive heating in mid-season, limiting the use of the backup system.
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Remarkably quiet operation , even when ramping up.
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An expected reduction in consumption compared to the old air conditioning unit alone, thanks to the higher coefficient of performance in heating mode.
Operating and maintenance tips for longevity
To maintain peak performance and impeccable indoor air quality :
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Clean filters every 4 to 8 weeks depending on usage.
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Maintain a stable setpoint (moderate day/night differences) in order to make the best use of the inverter .
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Maintain clearance around the indoor head and outdoor unit (patio side) for optimal airflow .
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Schedule annual maintenance : electrical inspection, sensors, fans, pressures and fittings.
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In winter, if the terrace receives significant accumulations, ensure clearance around the outdoor condenser.
Challenges specific to Plateau housing and solutions implemented
Buildings in the Plateau-Mont-Royal often feature through-spaces , high openings , and access to balconies/terraces . These features bring in light but also promote stratification and solar gain . Our approach:
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Choosing a high location to break up stratification and encourage air intake .
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Short outward path to limit losses and simplify maintenance.
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Treatment of finishes (baffles, discreet capping, sealing) to respect the aesthetics sought by the occupants.
What we guarantee, everywhere in Greater Montreal
AirGreen is a method , traceability and after-sales service . We operate in Montreal, Laval, Longueuil, on the North Shore and the South Shore with teams trained to RBQ and CSA standards , equipped to work efficiently in inhabited environments, and attentive to the small details that make a big difference: silence, finishes, air flow and ease of maintenance.
When to choose a wall-mounted heat pump like the Sharp ZU1
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Apartments, condos and duplexes where you are looking for a compact solution .
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Need economical heating most of the winter and precise air conditioning in the summer.
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Urban context with restricted outdoor spaces (balconies/terraces) and priority given to silence .
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Desire to reduce energy bills while improving comfort and air quality.
Key steps to a successful AirGreen project
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Technical visit : surveys, constraints, assessment of flow rates and lengths.
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Selection of capacity (BTU) based on the actual structure — insulation, orientation, glass surfaces.
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Layout plan (interior/exterior) with sketches and aesthetic solutions.
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Certified installation , testing and delivery of a commissioning sheet .
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Follow-up : maintenance reminder and support for grant eligibility if applicable.
In short , the installation of this Sharp ZU1 in Plateau-Mont-Royal shows how a well-chosen and perfectly integrated wall-mounted heat pump provides stable comfort , controlled consumption and a neat visual result — exactly what many Montreal households are looking for.
How it goes, from the first call to the end
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What the unit delivers when it is cold
The range as published on airgreen.ca: pick a size to see its capacity in deep cold.
| Size | Heating at −8 °C | Heating at −15 °C | Coldest certified point | COP at −15 °C | SEER | HSPF | Indicative LogisVert aid |
|---|---|---|---|---|---|---|---|
| Sharp ZU1 12 000 | 14,500 | 12,000 | −27 °C: 7,200 | 2.11 | 22.0 | 11.0 | $1,740 |
| Sharp ZU1 15 000 | 18,100 | 15,300 | −27 °C: 10,100 | 2.1 | 24.0 | 11.0 | $2,172 |
| Sharp ZU1 18 000 | 22,000 | 18,000 | −27 °C: 11,500 | 2.2 | 24.0 | 11.0 | $2,640 |
| Sharp ZU1 24 000 | 22,400 | 19,000 | −27 °C: 12,300 | 2.2 | 22.0 | 11.0 | $2,688 |
According to NEEP, it delivers 14,500 BTU/h at −8 °C (17 °F), more than at 8 °C (14,000 BTU/h). It heats as hard in moderate cold as in mild weather.
According to NEEP, its certified maximum capacity at −27 °C (−17 °F) is 7,200 BTU/h, 60% of its nominal 12,000 BTU size.
At 8 °C, its certified maximum capacity reaches 17,100 BTU/h, 42% more than its nominal 12,000 BTU size.
According to NEEP, it delivers 18,100 BTU/h at −8 °C (17 °F), more than at 8 °C (18,000 BTU/h). It heats as hard in moderate cold as in mild weather.
According to NEEP, its certified maximum capacity at −27 °C (−17 °F) is 10,100 BTU/h, 67% of its nominal 15,000 BTU size.
At 8 °C, its certified maximum capacity reaches 21,800 BTU/h, 45% more than its nominal 15,000 BTU size.
According to NEEP, it delivers 22,000 BTU/h at −8 °C (17 °F), more than at 8 °C (21,600 BTU/h). It heats as hard in moderate cold as in mild weather.
According to NEEP, its COP at −27 °C is 1.88: the highest of the ZU1 line, which ranges from 1.79 to 1.82 at that temperature.
According to NEEP, its certified maximum capacity at −27 °C (−17 °F) is 11,500 BTU/h, 64% of its nominal 18,000 BTU size.
At −27 °C, its certified minimum capacity is 3,200 BTU/h (5,500 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 19,000 BTU/h, 79% of its nominal 24,000 BTU size. Its COP there is 2.20.
Data read live from the airgreen.ca page of each size (NEEP / AHRI certified performance). When the title names the installed size, it is highlighted; otherwise the whole range is shown. The aid shown is today’s, using Hydro-Québec’s rule ($120 per 1,000 BTU/h at −8 °C); amounts quoted in the article date from its publication. Only Hydro-Québec confirms the assistance granted.
And at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Baseboards and electric furnaces turn 1 kWh of electricity into 1 kWh of heat. A heat pump delivers more: that is its COP. At Hydro-Québec’s rate D (11.142¢/kWh above 40 kWh a day, since 1 April 2026):
Hydro-Québec: a heat pump can be up to three times more efficient than baseboards for heating in the colder months.
Estimate per kWh of heat, at the chosen temperature, using the certified COP from the product page. Taxes, access charge and backup heat not included.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
Which type of equipment for your project?
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What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).