Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie (Montreal)
In Rosemont–La Petite-Patrie, AirGreen installed a Sharp ZU1 wall-mounted heat pump with an outdoor unit on a raised support, ideal for Montreal winters: stable mounting, optimized clearances and discreet integration for 4-season comfort.
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 we talk about four-season comfort in Montreal, we immediately think of a system capable of efficiently heating in winter, effortlessly cooling in summer, and remaining discreet on a daily basis. At AirGreen, we recently installed a Sharp wall-mounted heat pump in Rosemont–La Petite-Patrie , an area where brick buildings, balconies, and sometimes tight access require a careful approach, both technically and aesthetically.
On this residential project, the objective was clear: to improve interior comfort, reduce energy consumption, and ensure a robust, clean exterior installation adapted to the realities of the Quebec climate.
A simple, efficient and sustainable residential solution
Here we have a Sharp wall-mounted heat pump (mini-split) , a particularly popular choice for its stable operation, energy efficiency, and precise temperature control. The wall-mounted format is also ideal for homes where you want to avoid major ductwork work while still achieving excellent performance.
For this project, the most consistent model with the observed equipment is the Sharp ZU1 ( Eco Inverter range), often chosen for its balance between performance, comfort and energy saving.
Why a Sharp wall-mounted heat pump is relevant in Rosemont
Rosemont–La Petite-Patrie is a mix of plexes, small buildings and condominiums where each facility must comply with several constraints:
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Brick facades to be preserved (aesthetics + durability)
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Limited outdoor spaces (balcony, terrace, alley, backyard)
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Close proximity (so be mindful of noise, vibrations, and location)
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Montreal winter (snow, ice, de-icing cycles, thaws, etc.)
A Sharp wall-mounted heat pump is well suited to this type of environment: it offers stable regulation, rapid comfort, and relatively simple integration when the installation is done correctly.
Visible installation details and assembly highlights
In the photo, we can see several installation options which are exactly those we at AirGreen prefer to maximize reliability and longevity.
1) Outdoor unit on a raised support (winter and maintenance)
The outdoor unit is installed on a raised metal stand , a detail that makes all the difference in Quebec. Why?
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We limit the risks of being buried by snow
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We reduce exposure to ice accumulation on the ground
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Drainage is facilitated during defrosting.
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We maintain better accessibility for maintenance and service
In urban environments, where surfaces are often concrete and water can accumulate, this approach protects the device and avoids several common problems.
2) Location against a brick wall, with clearances respected
The unit is positioned near a brick wall, but with sufficient clearance for:
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ensure good air circulation through the fan
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avoid recirculating cold air
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to allow adequate service access (panels, connections, inspection)
A good location is not just “where it fits”: it is above all “where it breathes well”, otherwise you can lose in efficiency and stability.
3) Clean and aligned installation (aesthetics + performance)
The installation is straight , stable, well-aligned, and visually discreet. In Rosemont, where the exterior is often visible from the courtyard, alley, or neighboring balcony, the "clean and well-finished" appearance is as important as the performance.
4) Vibration reduction (comfort for occupants)
Mounting on a support, combined with a solid fixing, helps to limit:
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the vibrations transmitted to the structure
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the micro-noises that become annoying at night
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premature wear caused by repeated oscillations
This is a point that is too often overlooked. Yet, a silent system is also a well-installed system.
Interior comfort: what this type of Sharp brings to everyday life
A Sharp ZU1 wall-mounted heat pump is typically chosen to immediately improve living comfort:
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Stable heating : fewer fluctuations, more constant temperature
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Efficient air conditioning : rapid dehumidification and cooling
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Precise answer : the inverter adjusts the power according to the actual need, instead of doing an “on or off” operation.
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Comfort during mixed seasons (autumn/spring): perfect for Montreal, where temperature variations are frequent.
In an urban dwelling, this is exactly the type of system that can advantageously replace electric baseboard heaters that are "always on full blast" or a noisy portable air conditioner.
An installation designed to last (not just to function)
At AirGreen, we always emphasize a simple idea: a good heat pump is good… but a good heat pump that is properly installed is what makes the difference over 10 to 15 years.
The approach for this project aims to:
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winter protection (raising, water management)
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mechanical stability (solid support, controlled vibrations)
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actual performance (good clearance, good airflow)
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Respect for the residential environment (discreet integration)
It is this sum of details that makes a system remain pleasant, efficient and reliable year after year.
Conclusion: a well-integrated Sharp, for 4-season comfort in Montreal
This installation in Rosemont–La Petite-Patrie perfectly illustrates what we're looking for: a clean, robust, efficient result, adapted to local conditions. A Sharp wall-mounted heat pump , installed on a raised support and intelligently positioned, becomes a sustainable comfort solution, both in winter and during summer heat waves.
If you are in Rosemont (or elsewhere on the Island of Montreal) and you want to improve your comfort while keeping a discreet and well-thought-out outdoor installation, at AirGreen we know exactly how to adapt the system to your building, your space and your reality.
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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Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
The on-site estimate is free and the quote follows within 24 hours.
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).