Installation of a Sharp (ZU1 series) wall-mounted heat pump in Rosemont–La Petite-Patrie
In Rosemont, we are installing a Sharp wall-mounted heat pump (R-32, inverter) on wall brackets with a short cooling path and a disconnect box . A compact, efficient HVAC installation ready for Montreal's winter.
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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 compact, neat HVAC installation ready for Montreal winters
Client context and objectives
In a typical brick plex in Rosemont–La Petite-Patrie , our clients wanted a discreet and efficient HVAC solution for four-season comfort, without encroaching on the side driveway or the wooden fence. After load calculations and an electrical inspection, we selected a Sharp wall-mounted heat pump (ZU1 series, R-32 refrigerant, inverter) , a choice perfectly suited to Montreal's urban housing thanks to its high efficiency in cold weather and low noise level.
Why the Sharp ZU1 series for Montreal
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Heating efficiency down to low temperatures, ideal for the metropolitan climate.
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R-32 refrigerant , more efficient and with a lower GWP than the old R-410A.
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Inverter compressor to finely modulate power and reduce consumption.
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Available capacity range (≈ 12,000 to 24,000 BTU) allowing the power to be adjusted to the actual surface area.
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Simple maintenance and easy access to components for annual maintenance.
What we achieved on this project
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Installation of the condenser on galvanized wall brackets with anti-vibration pads: the unit is raised approximately 60 cm from the ground to clear the area of snow and promote air circulation.
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Ultra-short refrigeration path (≈ 2 to 3 m visible), drilled in the front and neatly covered for a clean appearance and excellent performance (less pressure losses).
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Dedicated power supply with external disconnection box and waterproof cable glands; the station is identified and accessible for any intervention.
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Rear and side clearance management : positioning calculated to respect manufacturer clearances, the fence and the side wall.
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Sealing of the drilling with high-performance mastic and continuous insulation of the lines to prevent condensation.
Construction site storytelling: precision in a narrow passage
The site has a narrow side driveway with a meter box nearby. We are planning the implementation in three stages:
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Identification of clearances (fence, masonry, meter) and laser tracing to align the support horizontally;
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Drilling with a slight slope towards the outside for the evacuation of any condensation and the passage of refrigeration connections;
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Fixing on mechanical anchors in the brick, installation of reinforced brackets , then installation of the unit with anti-vibration shimming.
The result: a compact and elegant unit that frees up floor space , protects equipment from winter splashes and leaves the way clear for occupants.
Everyday performance and comfort
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Quiet cooling in hot weather, precise diffusion flaps on the indoor head side (installed inside the housing).
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Stable heating in autumn/winter, without aggressive on/off: the inverter maintains a uniform temperature and reduces consumption peaks.
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Improved air quality thanks to wall-mounted head filters and modulation that limits drying.
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Energy savings : as a replacement (or in addition to) electrical backups, the heat pump covers most mid-season needs and a large part of Montreal's winter.
Key technical details of the installation
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Equipment type : Sharp wall-mounted heat pump , ZU1 range (R-32) , inverter .
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Retained capacity : configuration ≈ 12,000 BTU adapted to the surface area of the accommodation and its insulation (dimensions validated by our calculations).
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Support : galvanized wall brackets , blue anti-vibration pads , stainless steel bolts.
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Refrigeration connections : high density insulated copper , brazed and tested under nitrogen ; deep vacuum < 500 microns before commissioning.
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Electrical : Dedicated circuit , rated circuit breaker , adjacent disconnect box ; wiring in conduit for mechanical protection.
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Finish : grey capping coordinated with the facade, UV sealant , clear labeling for future maintenance.
AirGreen Site Challenges and Solutions
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Proximity to the meter and the service pole : we ensure the required electrical clearances and clean routing of the conduits.
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Narrow aisle : raised wall mounting to keep the space functional, limit the risk of impact and elevate the unit above snow accumulation.
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Vibrations and noise : anti-vibration pads and precise timing for discreet operation near neighbors.
Possible grants and eligibilities
High-efficiency wall-mounted heat pumps running on R-32 and designed for extreme cold may be eligible for certain provincial and Hydro-Québec programs, depending on the model and configuration. At AirGreen, we verify the current criteria for you , prepare the grant application and provide the required documentation .
HVAC Maintenance: Maintaining Performance Year After Year
Regular HVAC maintenance ensures longevity and consistent performance:
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Cleaning the internal battery and fan;
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Verification of operating pressures and temperatures;
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Checking electrical connections and condensate drainage;
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Inspection of the wall bracket, tightening and condition of the pads .
We offer maintenance plans tailored to homes in Montreal, Laval, Longueuil, North Shore and South Shore to keep your system running at its best.
Practical siting tips for brick buildings
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Raise the condenser (≈ 45–60 cm) to clear snow and facilitate drainage.
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Maintain clearances around the grid and avoid obstacles (fences, sheds, vegetation).
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Limit the length of refrigeration lines: the shorter the better (efficiency, reliability).
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Ensure the sealing of the drilling and the continuous insulation of the lines.
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Plan for maintenance : free access to the disconnect box and fittings for annual inspections.
Why entrust us with your heat pump project in Montreal?
At AirGreen , we combine rigorous sizing , clean execution and complete support (grants, commissioning, maintenance). Our team is fully familiar with Montreal's brick buildings and the constraints of Quebec winters ; each installation is designed to last , save money and remain discreet .
And what about your accommodation?
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we offer HVAC solutions adapted to your surface area, your insulation and your lifestyle. A technical visit is enough to validate the capacity (BTU) , the line route and the electrical feasibility , then we plan a surprise-free , turnkey installation.
Naturally integrated background keywords : heat pump , wall-mounted heat pump , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Sharp , R-32 , inverter , wall brackets , disconnect box , anti-vibration , brick .
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).