Installation of a Sharp ZU1 wall-mounted heat pump in Nuns' Island
In Île-des-Sœurs, AirGreen installs a Sharp ZU1 on an aluminum support with anti-vibration pads: discreet, silent and winter-ready HVAC installation . Serving Greater Montreal , Laval , Longueuil , North Shore , South Shore .
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.
Clean and quiet integration on a modern facade: the AirGreen method for four-season comfort
Project context: recent condo with architectural panel facade
On Nuns' Island , many newer buildings are adopting metal or composite panel facades, concrete balconies, and carefully designed access points. Our client, located on the ground floor of a condo, wanted a compact solution that would provide summer air conditioning and efficient supplemental heating in winter, without compromising the building's aesthetics or the neighborhood's tranquility. We chose the Sharp wall-mounted heat pump ( ZU1 series, new-generation refrigerant) for its acoustic simplicity, air filtration, and stability in cold weather—a real plus for Greater Montreal .
The reasons for choosing the Sharp ZU1 for the Montreal metropolitan area
Performance and reliability
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Inverter compressor intelligently modulates power to maintain a stable temperature, reduce start-ups and optimize consumption .
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Low GWP refrigerant ( R-32 family for the ZU1 series) more environmentally friendly than older generations.
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Useful heating capacity in cold weather, suitable for winters in Montreal , Laval , Longueuil , as well as the North Shore and South Shore areas.
Air quality and comfort
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Plasmacluster purification technology: limitation of suspended particles and odors, beneficial in urban condos where air renewal is sometimes limited.
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Fine regulation, progressive fan speed, reduced noise level to preserve the peace and quiet of occupants and neighbors.
The AirGreen installation: precise, durable and reversible
Outdoor installation on raised support
The condensing unit is installed on a raised , perfectly level aluminum support . We insert anti-vibration pads under each foot: this interface mechanically decouples the unit from the slab and limits solid transmissions. Three concrete benefits:
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Increased silence inside and outside;
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Sufficient clearance for condensation water and winter defrosting ;
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Protection against dirt and light blown snow.
The modern facade positioning, near a door and a control box, complies with regulatory clearances for suction and blowing. The overall effect remains discreet and consistent with the condo's architecture.
Refrigeration and electrical routing
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Back-to-back configuration with refrigerant connections (HVAC insulated copper) over short distances to minimize losses and optimize responsiveness .
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Single hole through the wall, watertight sleeve and careful sealing to maintain the integrity of the air barrier.
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Calibrated flares, tightening with a torque meter , deep vacuum (< 500 microns) then opening of the valves: this is the sequence which guarantees long-term reliability .
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Dedicated power supply compliant with the Canadian Electrical Code , suitable circuit breaker and accessible external circuit breaker.
Condensate management
The concrete terrace facilitates gravity drainage. Elevating the unit prevents accumulation under the base during defrost cycles, reducing the risk of ice. In areas exposed to river winds, we validate the orientation of the blowing to prevent any recycling of hot air in summer.
Sizing: the right capacity for a condo on Île-des-Sœurs
For a main living space of 450 to 800 sq ft , the power range is generally between 9,000 and 15,000 BTUs for air conditioning, depending on exposure, insulation, glass area and occupancy. The Sharp ZU1 series covers these needs (sizes available up to 24,000 BTUs). At AirGreen, we systematically validate:
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Solar gains linked to southwest-facing glazing, which is very common on the island;
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Infiltration rate of woodwork;
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Actual use of rooms (open area vs. closed rooms).
The inverter control then absorbs the variations, avoiding short cycles which degrade hygrometric comfort.
Site constraints and solutions applied
1) Architectural facade and aesthetic requirements
On a gray panel facade, every opening is visible. We favor a compact layout and a neat finish: caps, uniform seals, and stainless steel fasteners. The aluminum support visually harmonizes with the facade and remains easy to clean.
2) Controlled noise pollution
Condominiums often impose dB(A) thresholds. The ZU1 heat pump operates at low speed most of the time thanks to the inverter ; the anti-vibration pads + a fan imbalance control ensure a very soft sound signature , perceptible only in the immediate vicinity.
3) Riverside climate and sea spray
The proximity of the St. Lawrence River exposes certain equipment to humidity and salt spray. We apply treated fasteners , flow management that avoids stagnant areas, and HVAC maintenance recommendations to preserve the exchangers .
Result: comfort, energy efficiency and perfect integration
After instrumented commissioning (evaporation/condensation temperature readings, intensities, superheating/subcooling), the ZU1 delivers stable and uniform cooling in summer, and economical additional heating in mid-seasons and even in winter depending on the size chosen. Occupants benefit from filtered air and quiet operation. The outdoor unit, aligned and unobstructed, fits neatly into the doorway.
AirGreen Best Practices for Modern Condos
Choosing the outdoor location
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Leave 30–40 cm free in front of the grille for suction;
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Avoid recesses that encourage the recycling of hot air ;
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Provide a raised base for maintenance and ice melting.
Healing the connections
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Reduced length = better efficiency and less fluid used;
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Continuous line insulation, large bend radii, watertight joints .
Recommended HVAC maintenance
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Cleaning the inner head filters every 4–6 weeks during use;
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Gentle rinsing of the external battery (no high pressure);
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Annual maintenance : electrical check, inspection of exchangers, pressure/temperature readings, adjustments if necessary.
Grants and Eligibility
Recent high-efficiency R-32 wall-mounted heat pumps may be eligible for assistance programs (depending on current technical criteria, cold weather performance and installation certification). We support our customers in Montreal , Laval , Longueuil , North Shore and South Shore to validate eligibility, prepare documents and submit applications.
Wall-mounted or multi-zone heat pump: how to decide?
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Single-piece (single wall) : ideal for a main open area, low investment, quick work.
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Multi-zone : relevant if you want to treat several rooms (bedrooms, office). In a compact condo, a well-sized wall unit is often sufficient for 80–90% of needs, with a door and air circulation strategy .
What more we bring
AirGreen Method
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Detailed site survey, analysis of gains and constraints;
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Implementation plan and validation of clearances ;
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Connections to the torque meter , vacuuming , leak tests, commissioning with measurements ;
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Durable finish: stainless steel screws, clean seals, protected wiring.
Greater Montreal Service
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Clear sizing advice and comparisons;
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Verification of eligibility for aid;
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Planned HVAC maintenance to preserve performance and warranties ;
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Interventions covering Montreal , Laval , Longueuil , North Shore , South Shore .
Tips for getting the most out of your Sharp ZU1
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Maintain a stable setpoint ; avoid significant day/night variations.
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Allow the inverter control to work continuously rather than turning it off completely.
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Clear the outdoor unit before hot periods; remove leaves and dust.
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Schedule annual HVAC maintenance in spring or early fall.
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In winter, maintain a free air passage around the unit for efficient defrosting.
Conclusion
This project in Île-des-Sœurs illustrates the value of a rigorous HVAC installation in a modern environment: a Sharp ZU1 wall-mounted heat pump that integrates aesthetically , operates quietly and improves comfort all year round, with optimized consumption. At AirGreen, we apply the same requirement on each construction site in Greater Montreal , to deliver reliable, efficient and sustainable systems.
How it goes, from the first call to the end
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 the unit delivers when it is cold
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.
And 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.
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.
Which type of equipment for your project?
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Four mistakes we do not make
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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).