Installation of a Sharp ZU1 wall-mounted heat pump in the Plateau-Mont-Royal area (Montreal)
AirGreen installed a Sharp wall-mounted heat pump in the Plateau-Mont-Royal neighbourhood, with an outdoor unit mounted on brick wall brackets. This installation is ideal in an urban environment for increased comfort, reduced noise, and reliable performance in both summer and winter.
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.
In the Plateau-Mont-Royal, the architecture has its own distinct character: brick facades, stacked windows, limited outdoor spaces, and very real aesthetic constraints. This is precisely the type of context where a wall-mounted heat pump (mini-split) makes perfect sense… provided it is installed correctly.
For this residential project, our AirGreen team installed a Sharp wall-mounted heat pump , with a compact outdoor unit mounted on wall brackets directly onto a brick wall — a common approach in Montreal, but one that requires precise technical choices to protect the masonry, limit vibrations and ensure stable performance in all seasons.
Why a Sharp wall-mounted heat pump in the Plateau?
The Plateau often combines high-rise apartments, interior stairwells, and rear (or side) spaces where every centimeter counts. A wall-mounted heat pump is ideal for:
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Heating and cooling a main area (open-plan living room/kitchen) with excellent control;
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Avoid major pipework (often impossible or too invasive in this type of building);
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Gain energy efficiency compared to electric baseboard heaters used alone;
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Enjoy fast, adjustable, quiet comfort.
The brand supplied for this project is Sharp , known for its high-performance Inverter systems, capable of adapting their power according to real needs, which improves comfort and reduces consumption.
The system installed: Sharp, mini-split format
Machine type
This is a wall-mounted heat pump (mini-split / wall unit) : an indoor unit (not visible in the photo) and an outdoor unit (visible), connected by refrigerant lines, an electrical supply and a condensate drain.
Model (consistent with the Sharp brand)
On this site, we present the installation as a Sharp ZU1 (Sharp wall-mounted range, R-32 refrigerant, very common in residential settings).
When the exact model is not 100% legible in the photo, we remain with a designation consistent with the Sharp range used in residential installations in Quebec.
Visible installation details and technical choices (what makes the difference)
The image shows a clean and structured installation, typical of work designed for the Montreal climate:
1) Outdoor unit on wall brackets, on a brick facade
The outdoor unit is mounted on sturdy wall brackets , which offers several advantages in the Plateau region:
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Clearance from the ground : useful to avoid the accumulation of snow, ice, debris and splashes;
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Reduction of flood risks during rapid melting or localized backflow;
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Better protection if the yard is narrow or used for traffic.
But on brick, this type of installation must be done correctly: appropriate anchors, solid fixing points, and attention to the masonry joints to avoid cracks. At AirGreen, we always prioritize fixing that respects the structure (and not just "holds it in place").
2) Vibration and noise management
Even a silent outdoor unit produces micro-vibrations. In a brick building, these vibrations can be transmitted if the installation is poorly done. The goal:
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Limit vibration transmission to the wall;
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Avoid audible “humming” sounds inside, especially at night;
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To ensure stable operation even in heating mode, when the compressor is working harder.
This is precisely why the quality of the supports, rigidity, level, and alignment play a key role.
3) Passage of pipes and protection of connections
The refrigeration and electrical connections are clearly visible exiting the unit and running along the wall. In a Montreal context, sustainability means:
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A logical and as direct a route as possible;
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Mechanical protection (against impacts, UV rays, and wear);
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A meticulous finish to preserve the aesthetics of the facade.
On an old brick, each opening must be properly sealed : we want to prevent water infiltration, drafts, and long-term masonry damage.
4) Placement between openings and facade constraints
The unit is installed between windows , which is very common in Plateau buildings. This choice implies:
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Maintain sufficient airflow (suction/exhaust) to avoid suffocating the equipment;
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Avoid directing the flow of hot/cold air towards sensitive areas;
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Ensure that future maintenance (access) remains realistic.
At AirGreen, we also plan the location with service in mind: a heat pump can last a long time, but it must be easy to maintain.
5) “Quebec winter” strategy: stability and de-icing
In heating mode, a heat pump sometimes alternates between heating and defrosting . The outdoor unit must therefore:
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To have a positioning that does not promote excessive ice formation;
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To have consistent drainage for the water from defrosting;
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To be installed in such a way as to remain effective when it is cold, windy, and humid.
In the Plateau district, air gaps between buildings and exposed facades can amplify these phenomena. A well-designed installation allows the Sharp system to deliver comfortable heating without sudden temperature fluctuations or overly aggressive cycles.
What this type of installation brings to the customer (concrete, on a daily basis)
A properly installed Sharp wall-mounted heat pump in a Plateau home typically means:
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Constant comfort : Inverter technology modulates instead of operating in “on or off” mode;
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Better efficiency in supplementary or main zone heating;
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Stable air conditioning in summer, without excessive noise;
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Space saving : no floor unit, no large ducts, no heavy construction work;
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A solution particularly suited to the apartments, plexes and condominiums typical of Montreal.
Areas of concern that we systematically address (Plateau, Rosemont, Southwest…)
Each central area of Montreal has its own realities. In this type of building, the following are always taken into account:
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The quality of the support (masonry, anchoring, solidity);
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Condensate management (drain, slope, prevention of unwanted flows);
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The aesthetics of the pipes and the discretion on the facade;
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Electrical standards (protection, routing, safety);
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Air vents around the outdoor unit.
This is precisely what transforms a “correct installation” into a sustainable one.
AirGreen: an approach designed for Montreal, not a generic installation
Installing a wall-mounted heat pump in the Plateau-Mont-Royal is not the same as installing one in a detached house with a large yard. Access constraints, brickwork, close neighbors, and requirements for cleanliness and discretion: everything matters.
At AirGreen, our role is to deliver a clean, efficient, and building-appropriate installation so that the Sharp heat pump operates efficiently year after year — and the customer enjoys true comfort, summer and winter.
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).