Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
Sharp ZU1 wall-mounted heat pump installed in Rosemont–La Petite-Patrie : elegant integration on brick, quiet in the backyard and high efficiency, signed AirGreen , HVAC specialists in Montreal, Laval, Longueuil, North Shore and South Shore.
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.
An elegant integration on red brick that combines comfort, silence and four-season performance
In a red brick duplex in Rosemont–La Petite-Patrie , our team installed a Sharp ZU1 (R-32) wall-mounted heat pump . The owner's goal was clear: an efficient heating and cooling system, discreet for the backyard , and durable despite Montreal winters. The result: careful installation on wall brackets , refrigerant lines covered vertically up to the upper floor, dedicated electrical control, and meticulous commissioning that ensures silence and performance .
The context: a typical Montreal duplex, modern requirements
The building has all the characteristics of the area: solid brick walls, exposed concrete foundation in the basement, black-framed windows, fenced side passage , and an awning leading to the rear terrace. These elements dictate several technical choices:
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Vibration/Silence : The backyard serves as a living space. The unit had to remain inaudible to the occupants and immediate neighbors.
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Clearances and aesthetics : avoid multiple holes in the brick and maintain a clean verticality of the paths.
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Snow and ice : Mount the unit high enough to clear the snowpack , while still facilitating maintenance.
Why the Sharp ZU1 for this project
The Sharp ZU1 is a recent wall-mounted heat pump with R-32 refrigerant , designed for the residential market in Greater Montreal . It stands out for:
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Variable speed compressor for fine adjustment of power and optimized consumption .
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Heating operating range down to very low temperature , ideal for continuous use in winter.
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Reduced noise level from the condenser and indoor head, perfect for a backyard or side passage.
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Common capacity ranges (12k to 24k BTU) allow for accurate sizing based on actual heat load.
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Compatibility with energy efficiency programs in effect in Quebec when technical criteria are met.
Summary study of load and dimensioning
Before any installation, we carry out a thermal dimensioning : orientation of the facades, insulation of the brick walls, sealing of the windows, use of the rooms, and ventilation constraints. Here, the requirements indicated a single wall capacity sufficient to serve the main living areas, with the possibility of adding a second zone if the bedroom on the upper floor required it. The ZU1 offers the necessary modulation to cover seasonal load variations without overconsumption.
Preparation of the support and drilling on brick
Our technicians have:
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Locate the fixing point : solid, flat area of the facing, a good distance from the window sills and the wall corner to avoid structural constraints.
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Installed the support rails and galvanized brackets with sealing suitable for brick, anti-vibration pads at the base to limit sound transmission.
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Made a single drilling of controlled diameter for the connections, with gravity slope towards the outside and sleeve to protect the refrigeration insulation.
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Ensured watertightness by mastic and collar, in order to prevent any infiltration of air or water.
The choice of wall mounting was obvious: it frees up the ground, prevents snow accumulation , protects the unit from watering and facilitates air circulation.
Line routing and visual integration
The brown vertical capping was chosen to complement the red brick and black window frames . It houses:
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Insulated refrigerant pipes ;
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The communication cable ;
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The power wire when permitted by code (here, the main power runs separately to the outdoor disconnect box ).
The total visible length of the lines is approximately 3 to 4 meters , which remains within the ideal range for limiting load losses and maintaining efficiency. The bending radius has been respected to avoid any pinching of the copper.
Power supply and compliance
A dedicated circuit was run from the interior panel to a disconnect switch mounted near the condenser, as required by current standards. This device:
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Allows the technician to isolate the device during maintenance;
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Reduces apparent cable lengths;
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Ensures a clear reading of the installation for any inspection.
The circuit breaker and wiring gauge are sized according to the installed ZU1 nameplate. All penetrations have been sealed to prevent moisture from entering the masonry.
Condensate management: simplicity and reliability
Gravity drainage is preferred, with a continuous slope from the interior evaporator to the exterior. This choice:
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Eliminates the risk of condensate pump failure;
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Reduces maintenance;
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Avoid extra noise in a quiet home.
In the cold season, we provide sufficient clearance under the unit and the possibility of adding, if necessary, a small deflector to direct runoff away from the foundation.
Commissioning: precision and traceability
A high-performance HVAC installation begins with commissioning . Our key steps:
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Deep vacuum draw down to ≤ 500 microns , stabilization and rise control to ensure the absence of moisture and leaks.
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Opening the valves and checking the factory load .
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Superheat and subcooling controls, current draw and voltages .
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Acoustic test stage side: we confirm that the unit remains very discreet at normal listening distance.
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Remote control configuration (setpoint ranges, automatic ventilation, dehumidification mode) and personalized advice to the owner.
Result: uniform comfort and preserved facade
The unit provides stable blowing , reduced temperature rise time and an outside noise level that blends into the courtyard atmosphere. The façade remains clean thanks to the discreet capping, aligned brackets and unique line routing. In terms of consumption, the ZU1's modulation helps limit start-ups/stops and promotes significant energy savings compared to a conventional air conditioning system.
AirGreen Best Practices for Brick Homes in Montreal, Laval, Longueuil, North Shore and South Shore
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Installation height : Aim for 18 to 24 inches above finished grade or more depending on local snow accumulation.
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Clearances : respect the free field in front of the exchanger and avoid any obstacle (fence, BBQ, dense vegetation) which would hinder the air flow.
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Anchoring : use mechanical anchors suitable for brick (and not mortar alone).
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Single path : a single clean hole is better than a succession of holes.
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Electricity : Dedicated circuit and external disconnection to facilitate service.
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Condensates : favor gravity ; if a pump is essential, provide access and an alarm .
These recommendations apply to plexes on the Plateau as well as to houses in Laval , bungalows on the South Shore and recent constructions on the North Shore .
Maintenance: What we recommend every year
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Cleaning and disinfection of filters and the internal exchanger.
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Checking of operating pressures and visual verification of the tightness of the connections.
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Inspection of electrical connections and disconnect box .
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Checking the clearance of the condensate drain holes .
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Defrosting test at the start of winter and gentle washing of the outdoor exchanger in spring.
Regular maintenance maintains seasonal performance , extends lifespan and prevents performance drops at critical times (heat waves, intense cold).
Pitfalls to avoid when undertaking a similar project
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Undersize capacity based on square footage alone: infiltration and exposure must be considered.
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Neglecting acoustics : Poor orientation of the fan towards a reflective wall increases the perceived noise.
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Light capping on dark brick: the visual difference attracts the eye; choose a shade close to the facing.
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Drilling without slope : creates water retention in the sheath and risks of odor.
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Lack of disconnection : non-compliant and penalizing for maintenance.
Grants and Eligibility: The AirGreen Approach
Depending on the chosen parameters (capacity, seasonal efficiency, low temperature performance, certification), a wall-mounted heat pump like the ZU1 may be eligible for certain assistance programs available in Quebec. We support our clients in verifying the criteria and preparing the documents , whether in Montreal , Laval , Longueuil , on the North Shore or the South Shore .
Why entrust your HVAC installation to AirGreen?
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Local expertise : daily practice with the brick facades and narrow courtyards typical of Montreal.
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Finish : aligned covers, clean anchors, and legible wiring .
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Technical rigor : vacuum measurement , superheat / subcooling checks, documented commissioning tests.
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Support : advice on use, maintenance and help with financial aid procedures .
In summary , this Sharp ZU1 installed in Rosemont–La Petite-Patrie brings to the duplex controlled comfort in all seasons, a respected facade and economical operation . This is exactly the type of achievement that made AirGreen's reputation in Greater Montreal .
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.
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
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).