Installation of a Sharp ZU1 wall-mounted heat pump in Plateau-Mont-Royal (Montreal)
AirGreen installs a Sharp wall-mounted heat pump (R-32) in a condo in Plateau-Mont-Royal: discreet design, gravity drainage, dedicated wiring and four-season performance. HVAC installation service throughout Montreal , Laval and surrounding areas.
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.
When aesthetics meet performance: an HVAC installation designed for a typical Plateau condo
In this bright condo in Plateau-Mont-Royal , our team installed a Sharp wall-mounted heat pump (ZU1 range, R-32 refrigerant) to provide four-season comfort, while respecting the spirit of the place: high ceilings, large bay window, raw wood furniture and designer lighting. The objective is twofold: to efficiently cool the living area in summer and heat stably and economically in winter , without compromising on aesthetics or acoustics.
Customer context
The owner often works from home. His old portable air conditioner was obstructing traffic and providing no heating performance. His priorities:
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a silent solution,
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energy efficient (R-32, high efficiency),
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a discreet integration into the decor,
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a complete service (advice, installation, calibration, maintenance).
Why the Sharp ZU1 (R-32) makes a difference in Greater Montreal
Four-season yield
The Sharp ZU1 is a new generation wall-mounted heat pump using R-32 , a refrigerant with a lower GWP than R-410A. It provides reliable heating in cold weather and stable cooling during heat waves. In the weather conditions of Montreal , Laval , Longueuil , North Shore and South Shore , this profile is ideal: the machine covers most of the off-season heating needs and significantly reduces the building's demand for air conditioning.
Silence and comfort
The interior head, installed high on the wall, features a motorized shutter providing even diffusion. The reduced noise levels allow you to work in the room without background noise, a significant benefit for open spaces and adjoining apartments on the Plateau.
Energy efficiency and subsidies
Thanks to its high efficiency and the use of R-32 , the Sharp ZU1 is part of the energy transition programs generally available to high-performance heat pumps in Quebec (depending on eligibility and configuration). The result: a better controlled electricity bill and an accelerated return on investment, especially for households heating with electricity.
Our approach to HVAC installation in a Plateau condo
Identification & integration design
The chosen area is an interior load-bearing wall above a large mirror; it serves the living room, the dining room and the hallway leading to the bedrooms. This position:
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captures hot air returns in summer (chimney effect);
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distributes heat in winter to adjacent rooms;
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minimizes the length of the connections to the outside (≈ 2 to 3 m).
Drilling & crossing
We make a 2-3" hole with a slight slope towards the outside for gravity drainage . The crossing sleeve is insulated and sealed to avoid any thermal bridge or air infiltration. On the outside, the outlet is discreetly covered , painted if necessary to blend in with the facade.
Refrigerant connections & capping
The insulated copper tubes and the communication cable are routed in a white cover (capping) coordinated with the light walls of the condo. The short route limits pressure losses and simplifies maintenance. Outside, the connections are fixed on brackets or on a slab depending on the location of the condenser (backyard/gallery), with expansion loops and UV protection .
Power supply
The machine is powered by a dedicated circuit (compliant circuit breaker) from the housing panel. We check the wiring sections , grounding , and the nominal current value according to the capacity (e.g. 12,000 to 18,000 BTU). The external disconnect is installed within visual range of the condenser.
Commissioning & calibration
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Vacuum draw to the required threshold, leak test.
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Refrigerant release according to the machined charge.
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Setting of modes, speeds, air direction, and calibration of the probe to limit setpoint deviations.
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Customer training : filters, dehumidification mode, defrosting in winter, correct use of settings (21-23°C in heating, 24-25°C in cooling for comfort/economy balance).
Construction site challenges and solutions
1) Respect for interior aesthetics
The sculptural light fixture and large mirror impose a precise geometry : we center the head above the frame , at a height of approximately 2.2 m , for an air flow that does not directly hit the occupied area. The fixings are anti-vibration to preserve silence.
2) Reliable drainage without a pump
The client wanted to avoid a condensate pump . The wall configuration and exterior access allow for a gravity drain with tube insulation to prevent condensation on interior surfaces in the summer. The slope is checked at level.
3) Outdoor access in dense environments
In the Plateau, alleys and balconies reduce the available space. We choose a protected location for the outdoor unit: off the road, clear of 30 cm at the rear and sides, raised to protect against snow and leaves, with a deflector if necessary to prevent air recirculation.
Results for the owner
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Rapid cooling of the living area when hot days return.
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Stable heating from autumn onwards, with superior perceived comfort through gentle diffusion (no burning air or aggressive fluctuations).
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Lower noise vs. portable unit: The Sharp wall-mounted heat pump operates at low speed most of the time.
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Energy savings thanks to the inverter compressor and R-32 .
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Visual integration : discreet capping, no superfluous visible sheathing, harmonized colors.
AirGreen Best Practices for Montreal Housing
Sizing
We favor precise sizing (surface area, orientation, envelope, infiltration). Oversizing generates short cycles , noise and insufficient dehumidification ; undersizing fatigues the equipment. We target the actual load range of the condo.
Airflow direction
In narrow apartments, we direct the flow along the wall to avoid the sensation of a draft . In heating mode, we favor a vertical sweep which pushes the hot air towards the floor.
Winter Anticipation
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Snow clearance for the outdoor unit;
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Raised support and anti-vibration mat ;
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Management of defrost condensate outside to prevent ice.
HVAC Maintenance
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Cleaning the filters once a month in summer, every 2-3 months in winter;
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Annual inspection : pressures, connections, evacuation, drain, fins, updating of user parameters;
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Gentle disinfection of the evaporator to preserve indoor air quality.
Common Pitfalls to Avoid (and How to Prevent Them)
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Poorly oriented drilling → water stagnation: we apply a controlled slope and protect the drilling.
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Wiring on shared circuit → disconnections: installation on dedicated circuit only.
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Condenser too enclosed → loss of capacity: respect clearances and, if necessary, deflectors .
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Choice of an R-410A model for grant-oriented customers: we offer recent R-32 / R-454B ranges .
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Neglected aesthetics : matching capping , optimized path, hidden screws.
And for you, in Montreal , Laval , Longueuil , North Shore and South Shore
Whether you live in a plex in the Plateau , a new condo in Ville-Marie , or a house in Laval or on the South Shore , our team adapts the planning , sizing , and installation . We manage the eligibility documents when the chosen heat pump meets the criteria of the programs in force, and we coordinate the installation to minimize interruptions at your home.
Technical sheet (usage summary)
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Type : wall-mounted inverter heat pump (Sharp, ZU1 range, R-32 )
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Typical capacities : 12,000 to 18,000 BTU (others on request)
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Functions : heating, air conditioning, dehumidification, eco/silent mode
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Installation : single drilling, gravity drain , connections ≈ 2–3 m
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Maintenance : washable filters, annual inspection recommended
Testimony collected after commissioning
"The unit disappears into the background and keeps the room at exactly the right temperature. The work is clean and the wiring is invisible. We finally have space and silence."
Next step
Would you like an estimate for a similar HVAC installation in Plateau-Mont-Royal , Laval , or on the South Shore / North Shore ? We offer a quick technical visit , R-32/R-454B options tailored to your home, and comprehensive support through to commissioning.
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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Four mistakes we do not make
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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).