Installation of a Sharp ZU1 wall-mounted heat pump in Ville-Marie (Montreal)
AirGreen installed a Sharp ZU1 wall-mounted heat pump in Ville-Marie, ideal for a Montreal condo: quiet operation, efficient heating in winter, effective air conditioning in summer, and aesthetic integration thanks to a thoughtful location and careful finishing.
Take a tour of the installation
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
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 you think of Ville-Marie, you think of bright condos, optimized spaces, open-plan living areas… and a very real need: stable, quiet, and efficient comfort, whether during summer heat waves or the bitter cold of Quebec. At AirGreen , we recently installed a Sharp wall-mounted heat pump , a particularly relevant choice for this type of residential environment where a high-performance solution is desired without sacrificing aesthetics.
The photo clearly shows a wall-mounted indoor unit installed high on a clean, unobstructed wall, oriented to ensure even air distribution throughout the room. This seemingly simple installation is actually the result of precise technical decisions: location, noise level, airflow, condensation management, and discreet integration of the refrigerant lines.
A Sharp wall-mounted heat pump: the right size for a condo in Montreal
The type of machine seen here is a wall-mounted heat pump (mini-split/wall unit) . This is often the best option in condos and apartments in Ville-Marie because it allows for:
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Heating and air conditioning with a single unit
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Very good energy efficiency (better controlled bills)
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Rapid comfort : the air is treated directly in the living area
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Installation without major work (no additional pipe network required)
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Quiet operation , essential in dense urban environments
In this project, we selected a model consistent with the Sharp residential range: Sharp ZU1 (R-32) . Based on the typical unit size in Ville-Marie and the common configuration (open living/kitchen areas), a frequent size is around 18,000 BTU (variable depending on insulation, windows and orientation).
Why the Sharp ZU1 model is particularly suitable
The Sharp ZU1 is appreciated for its versatility and ability to deliver consistent comfort throughout the seasons. In a Montreal context, the most sought-after features are:
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Heating performance during cold periods (and not just “summer air conditioning”)
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Stability : avoid overly aggressive cycles, temperature variations, and excessively dry air
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Acoustic comfort : a discreet indoor unit that blends in perfectly.
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Energy efficiency : a system that works intelligently, without over-consuming.
The R-32 refrigerant (used in this range) is also an interesting element: it is common in new generation solutions and is part of the market's evolution towards more efficient refrigerants.
Visible installation details: what the photo reveals
Even without seeing the exterior, several technical points clearly stand out:
1) Indoor unit installed high up, near a corner of the wall
This is an excellent choice for:
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Maximize the blower's reach and air circulation in the room
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Prevent airflow from being blocked by furniture
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Promote a more even distribution (fewer “hot/cold spots”)
At AirGreen, we always validate the living areas: sofa, dining table, office space, adjoining bedrooms. The goal is to achieve comfort where people live , not just “a beautiful installation on the wall”.
2) Clearance and aesthetics
The unit is placed on a clean wall, without any immediate obstructions. In a condo, visual integration is extremely important. The goal is:
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Careful alignment (level, symmetry)
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A clean, minimalist look
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Pipe runs should be as discreet as possible (well-placed cable tray or optimized wall penetration).
3) Air diffusion and direction component
You can see the lower flap (diffuser) which directs the air. On a wall-mounted heat pump, comfort depends heavily on:
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Regarding the direction of the airflow (avoid blowing directly on the occupants)
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Adjusting the fins (horizontal/vertical)
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Regarding the operating mode (heating vs. air conditioning)
At the end of the project, we take the time to configure the device and explain the settings useful to the client: modes, speeds, realistic temperatures, and tips for stable comfort.
Key steps in an AirGreen installation in Ville-Marie
Evaluation and sizing
Sizing isn't simply a matter of "choosing 12,000 or 18,000 BTU." In Ville-Marie, we pay attention to:
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Fenestration (large glazed surfaces are common)
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The orientation (direct sunlight in the afternoon, greenhouse effect)
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Ceiling height (varies depending on the building)
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Insulation, shared walls, and the presence of adjacent common areas
Proper sizing is the foundation for:
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Reduce noise
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Avoid short cycles
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Maximize efficiency
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Increase the lifespan of the equipment
Location selection
We are looking for a place that combines:
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Performance (air circulation)
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Silence (to limit the spread of sound)
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Accessibility (future maintenance)
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Discretion (aesthetics)
Passage of connections and condensation management
Even though the photo doesn't show the pipes, a successful installation depends on:
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The quality of refrigeration connections
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The right condensate drain (slope, safety, prevention of odor backflow)
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A clean finish (trunking, penetrations, sealing)
Commissioning and testing
AirGreen carries out systematic checks:
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Waterproofing and pressure
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Starting up in heating and air conditioning mode
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Blower temperature control
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Validation of the unit's behavior (noise, vibration, stability)
Winter comfort: what we really want in Montreal
Many customers tell us: "We mainly want to be comfortable in winter, without breaking the bank." That's exactly where the Sharp wall-mounted heat pump makes perfect sense.
For heating, a properly installed and sized heat pump:
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Heats up quickly during temperature changes
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Maintains a stable temperature
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Reduces reliance on electric baseboard heaters
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Offers a gentler level of comfort than an “on/off” heating system.
And in the summer, it becomes a remarkably efficient air conditioner — especially in a condo where heat can build up quickly.
Usage tips (simple, but essential)
To get the most out of a Sharp wall-mounted heat pump:
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Avoid constantly changing the temperature: aim for stability.
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When using air conditioning, close the curtains in direct sunlight (immediate benefit).
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Clean the filters regularly (cleaner air + better efficiency)
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Perform regular maintenance: a clean appliance works better and lasts longer.
At AirGreen, we like the installation to be flawless, but also for the customer to know how to enjoy it on a daily basis.
Why entrust the installation to AirGreen
In Ville-Marie as elsewhere in Greater Montreal, a wall-mounted heat pump is not “just” a device: it is a complete system, which must be designed for your reality (space, habits, acoustics, aesthetics, performance).
With AirGreen you get:
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An approach focused on sizing and actual performance
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A clean, discreet and durable installation
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Clear explanations, without unnecessary jargon
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A result that aims for comfort… and peace of mind
The unit on this job, in figures
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.
The big day, step by step
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 would it look like 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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
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).