Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installs a Sharp ZU1 in Rosemont–La Petite-Patrie : R-32 wall-mounted heat pump , positioned above a door to serve hallways and rooms, gravity drain, clean finishes and HVAC maintenance provided. Serving Greater Montreal.
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The job on one screen
The unit’s data sheet
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 article, chapter by chapter
A precise choice for a Montreal apartment: comfort, silence and air quality, installed by AirGreen
At AirGreen , we work weekly in plexes and apartments in the heart of Montreal . In this Rosemont–La Petite-Patrie home, we are installing a Sharp ZU1 wall-mounted heat pump (R-32 refrigerant) to provide reliable heating in winter and discreet air conditioning in summer, with excellent air quality thanks to Plasmacluster technology.
The context: a dual-aspect apartment, central corridor and close-set doors
Rosemont apartments often have load-bearing masonry walls on the street side and a row layout . Here, the interior headboard is placed above a door frame , in line with a corridor leading to the main rooms. This positioning guarantees:
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longitudinal diffusion of the air flow towards the bedroom and the living room;
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homogeneous recycling without dead zones behind the frames;
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minimal visual impact above existing moldings.
We respect the vertical clearances recommended by the manufacturer to avoid recirculation of hot/cold air under the ceiling and to facilitate access to the filters.
Why the Sharp ZU1 in a Montreal plex
The ZU1 series is one of Sharp's recent R-32 ranges. It combines:
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Fine modulation inverter to maintain a stable temperature and reduce consumption ;
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extreme cold operation adapted to Montreal winters (efficient heating in sustained negative temperatures);
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Plasmacluster Ion to eliminate particles and allergens in living areas;
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simple, straight-line design that fits well with renovated duplex/triplex interiors.
The result: four-season comfort and improved air quality in a compact format, ideal for urban housing.
Installation details: precision and cleanliness to the millimeter
Drilling and crossing. We make a discreet drilling behind the unit, with a watertight bulkhead and finished collar . The 2–3% slope of the drain ensures gravity flow of condensate, without an additional pump.
Refrigerant connections. The insulated copper lines are flared to the torque and pressurized with nitrogen for leak testing before vacuuming. Externally, they are capped (white capping) for a clean and durable finish.
Power supply. The circuit is connected to the dedicated and protected line required by the manufacturer, with a properly sized circuit breaker in the panel.
Anti-vibration. We use spacers and flexible washers at the head mounting points to eliminate structure-borne noise, which is valuable in adjoining buildings where sound transmission can disturb neighbors.
Height and airflow. Placed high up, the head uses the motorized shutter to sweep the corridor: the treated air passes through the doorway and supplies two zones without direct drafts on the occupants.
What we check before leaving
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Drain evacuation test (simulated pouring);
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High vacuum to the micron before opening the fluid;
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Checking amperage and supply/return temperatures in heating and cooling modes;
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Anti-cold air draft setting in heating and automatic restart after power cut.
These steps ensure optimal performance and extend the life of the installation.
Daily comfort: silence and air quality
In an apartment, the noise level of a wall-mounted heat pump makes all the difference. The ZU1 excels with its fine low-speed ventilation and inverter modulation that prevents on/off cycles. The Plasmacluster operates continuously: ideal for seasonal allergies and dust in traffic areas.
Sizing and Use: The Importance of the Right BTU
We size each project taking into account:
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of the heated/air-conditioned surface actually served;
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the quality of the insulation (windows, walls, ceiling);
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solar gains (exposure of rooms);
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of the open door strategy between hallway, bedroom and living room.
In this case, a power of the ZU1 range suitable for an apartment floor ensures the efficiency/consumption balance without oversizing.
Interior finishes: integrate without distorting
The painted moldings and the soft palette of the room require careful installation :
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strict alignment with the door lintel;
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minimal interior cable duct , invisible from the front;
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respect for paint marks and joint layout so that the head looks “original”.
HVAC Maintenance: Simple, Fast, Essential
To ensure the heat pump maintains its performance:
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cleaning filters every 4 to 6 weeks during peak periods;
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gentle washing of the head exchanger according to use;
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annual AirGreen inspection : pressures, ejection temperature, electrical tightening, condition of the external capping, clearances around the condenser.
Regular HVAC maintenance prevents overconsumption, reduces odors and prevents slow leaks.
Grants and Eligibility
Wall-mounted heat pumps that perform well in extreme cold and use modern refrigerants like R-32 are often eligible for assistance programs in Quebec. We support our clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore to prepare applications and maximize return on investment .
Common Pitfalls…and How We Avoid Them
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Head too close to the ceiling : we respect the minimum clearance to avoid recirculation.
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Drain without slope : systematic flow test, installation of anti-siphon elbow if necessary.
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Drilling in the wrong place : pre-tracing to fall between uprights and avoid cables/columns.
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Oversizing : simplified thermal study, priority given to real comfort and inverter modulation.
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External nuisances : choice of a location for the condenser with silent blocks and orientation of the blowing away from neighbors' windows.
Result obtained
The apartment benefits from stable heating even during prolonged cold spells, gentle air conditioning in the summer, and improved air quality on a daily basis. All this with an aesthetic integration that respects the character of the Montreal plex.
Why AirGreen for your HVAC installation in Montreal and surrounding areas?
We bring together:
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certified and equipped teams for R-32 / R-454B technologies;
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a proven, checklist-controlled installation methodology ;
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in -depth knowledge of buildings in Greater Montreal (plexes, condos, houses on the North/South Shore);
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after-sales service that supports your device throughout its lifespan.
We respond quickly in Montreal, Laval, Longueuil, North Shore and South Shore , with clear appointment slots and a cleanly maintained site.
Practical tips for optimizing your wall-mounted heat pump
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Leave doors open in areas to be served to promote stratification and homogeneity.
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Program a constant setpoint rather than temperature yo-yos.
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In winter, activate the anti-cold air flow function ; in summer, use horizontal blowing to extend the range.
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Have an annual maintenance carried out: it’s inexpensive and protects your investment.
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Monitor the drain area : any seepage must be reported quickly.
In short: This Sharp ZU1 installation in Rosemont–La Petite-Patrie shows how a properly sized and installed wall-mounted heat pump transforms the comfort of a Montreal apartment, while controlling energy costs and improving air quality . With AirGreen , you benefit from a rigorous HVAC installation and comprehensive support, from maintenance subsidies .
The job tools
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.
How the job unfolds
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 we check on a job like this one
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.
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.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
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).