Installation of a Sharp ZU1 series wall-mounted heat pump in Nuns' Island
Sharp wall-mounted heat pump (ZU1 series, R-32) installed on a balcony in Île-des-Sœurs : raised support, short cooling path, condensate management and professional commissioning. AirGreen, HVAC installation expert in Montreal.
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.
Four-season comfort in a condo: a specific intervention on the balcony
In Île-des-Sœurs, we are modernizing the comfort of a condo by installing a Sharp ZU1 series (R-32) wall-mounted heat pump. The project is taking place on a tiled balcony, with direct exterior access and a nearby railing. The goal: to provide stable heating in winter and discreet air conditioning in summer, while respecting the co-ownership and good HVAC installation practices in urban areas.
The client context and the challenges of a Montreal balcony
The client was looking for a quiet, efficient, and compact system for a limited space. The usual constraints in co-ownership apply: noise limitation, condensate management to prevent leaks to the downstairs neighbor, and careful integration of the wall passage visible from the terrace. The immediate proximity of the room to be treated allows for a very short refrigeration path, promising higher efficiency and less heat loss.
Technology Choice: Sharp ZU1 Series with R-32 Refrigerant
We are choosing a Sharp R-32 wall-mounted heat pump from the ZU1 range , known for:
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Continuously modulated DC inverter technology : better temperature stability and energy savings.
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Efficiency in cold climates : performance maintained during episodes of −25°C to −30°C, ideal for Montreal and its windy islands like Île-des-Sœurs .
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Reduced noise level on both the condenser and evaporator sides, essential in co-ownership.
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Use of R-32 , with lower GWP than R-410A, helping to reduce the environmental footprint.
Expected result: a high COP for most of the heating season and a competitive SEER in summer, with a controlled energy bill.
Installation details: precision and durability
Raised support and vibration protection
The condenser is fixed on a raised aluminum support anchored to the balcony floor, with anti-vibration pads and stainless steel bolts. This configuration:
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protects the machine against water accumulation and frost;
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elevates the device for easier maintenance;
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limits the transmission of vibrations to the slab, reducing the noise perceived in the condo and among neighbors.
Short refrigeration path and clean wall passage
The wall passage is made through the casing, less than one meter from the interior head. The waterproof sheath protects the refrigeration lines and the communication cable; an external seal ensures air and water tightness. A total estimated path of 2 to 3 m maximizes efficiency: less pressure loss, less fluid required as supplementary fluid and better thermal response.
Condensate management: no traces on the terrace
Here we favor gravity flow from the indoor unit, with a regulatory slope and discreet outlet to the outside. If necessary, a condensate deflector prevents drips on the tiles and facade. This approach avoids the addition of a pump (a potential source of noise and maintenance) while remaining compliant with co-ownership rules .
Clearances, safety and aesthetics
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Rear and side clearances comply with Sharp manuals for optimal airflow.
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Fasteners tightened to the recommended torque; check the flatness of the support to prevent vibrations.
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Discreet path : all visible exits are finished in white to match the steel-blue joinery and the light-colored rendering of the facade.
Commissioning: measurable quality
Our technicians proceed in standardized steps:
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Calibrated and lubricated flares , tightening torque checked by dynamometer .
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Nitrogen test to detect the slightest leak.
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Deep vacuum (< 500 microns) with vacuum resistance control.
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Fluid opening and superheat/subcooling measurements , voltages, currents and blown temperatures.
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Setting of Silent/Night and Anti-Breeze modes according to union rules.
The commissioning report includes photos, readings and recommendations for annual HVAC maintenance (coil cleaning, condensate control, fastener and torque verification).
Results for the owner
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Immediate comfort : rapid temperature rise, uniform air conditioning in summer, reduced variations.
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Controlled noise : thanks to anti-vibration pads and clearances, the device remains discreet, even with the balcony open.
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Reduced bill : Inverter modulation + short path = high efficiency and optimized cycles.
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Durability : corrosion-resistant materials, installation outside areas of stagnant water, stainless steel screws, long-lasting seals.
AirGreen Best Practices for Condominium Balconies
Preliminary draft
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Reading the co-ownership regulations : heights, permitted locations, noise levels, condensate drainage.
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Analysis of slab loads and bearing capacity , choice of appropriate support.
During the works
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Protection of the floor covering (tiles) and the guardrail .
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Controlled drilling to preserve the airtightness of the envelope (air barrier/vapor barrier).
After installation
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Explanation of eco modes , filters and maintenance reminders .
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Proposal of an annual maintenance contract to maintain performance over time.
Grants and Eligibility
New-generation R-32 wall-mounted heat pumps that perform well in cold weather may be eligible for certain assistance programs in Quebec. Eligibility varies depending on the power, efficiency values, and housing configuration. We will verify with you that the criteria meet and, if applicable, prepare the application for Montreal, Laval, Longueuil, North Shore, and South Shore .
Expert tips to extend the life of your system
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Maintain 1.5 m of clear clearance in front of the condenser grille.
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Clean the inner head filters every 4 to 8 weeks during periods of heavy use.
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Avoid storing objects under the condenser; air must circulate freely .
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Schedule annual HVAC maintenance : electrical inspection, pressures, blown temperature, condensate control , tightening of fasteners.
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In winter, clear snow from the condenser area if accumulations appear after a thaw.
Why AirGreen for your condo in Île-des-Sœurs and elsewhere in Greater Montreal?
Our team is adept at understanding the specifics of high-rise buildings , terraces and balconies . We work with the right equipment (aluminum supports, anti-vibration mounts, professional seals) and a proven methodology to combine energy performance , silence and aesthetics . Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we offer tailor-made solutions: wall-mounted heat pumps , MultiZone heat pumps , central systems , fresh air accessories and complete HVAC maintenance .
Quick Project Sheet
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Machine type : Sharp wall-mounted heat pump ( ZU1 range, R-32), Inverter modulation.
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Location : tiled balcony, Nuns' Island (Verdun).
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Support : raised aluminum structure + anti-vibration pads .
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Route : approximately 2–3 m , direct wall passage protected by a sheath.
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Condensates : gravity with slope; external deflector to protect the facade and the neighborhood.
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Key advantages : high efficiency, low noise, neat aesthetics, simplified maintenance.
Conclusion
This project illustrates our approach to condominium balconies : a clean, measured and sustainable HVAC installation , which enhances the comfort of the home without compromising for the neighbors. The Sharp ZU1 series wall-mounted heat pump offers the ideal balance between winter performance, summer air conditioning and discretion. At AirGreen, we support each client, from model selection to commissioning , then to annual maintenance , throughout 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.
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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).