Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installs a Sharp ZU1 R-32 on a balcony in Rosemont–La Petite-Patrie: wall-mounted heat pump , neat installation, quiet and efficient in winter. Maintenance support and subsidies for 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.
A careful installation on an urban balcony, designed for four-season comfort, acoustic discretion and durability in the Montreal environment.
Context: a condo in Rosemont, need for stable and quiet comfort
At AirGreen , we are working in a typical brick building in Rosemont–La Petite-Patrie . The owner wants a compact, economical and quiet heating and air conditioning solution, compatible with co-ownership rules and limited outdoor space (balcony with metal railing). We offer a Sharp ZU1 wall-mounted heat pump (R-32 refrigerant) , renowned for its performance in cold climates and its Plasmacluster Ion air quality.
Why the Sharp ZU1 for a Montreal condo?
Next-generation efficiency and refrigerant
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R-32 low GWP, reduced charge vs. R-410A.
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Wide modulation inverter compressor: stable comfort, lower consumption in mid-seasons.
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Extreme cold operating range (XLTH configuration of the ZU1 range) allowing reliable heating during winter peaks in Greater Montreal.
Indoor air quality
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Plasmacluster Ion technology works in the room being served to limit particles and odors. For a condo overlooking busy roads, this technological advantage improves the perceived air quality on a daily basis.
Co-ownership compliance and acoustic comfort
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Low exterior noise level with quiet mode, ideal for shared balconies and Rosemont interior courtyards.
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Clearances optimized to preserve circulation on the balcony without obstructing exits.
HVAC Installation Details: Clean and Durable Execution
Positioning and support
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Outdoor unit mounted on a raised galvanized aluminum support , anchored for rigidity. This raised support limits snow accumulation, facilitates condensate drainage, and reduces the absorption of dirt.
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Anti-vibration pads under the base to reduce micro-vibrations transmitted to the balcony slab and the guardrail.
Drilling and refrigeration route
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A single hole through the brick wall leads to the living area. We maintain a regular slope for the drain and a curvature that respects the minimum radius of the pipes.
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Short linear length (approximately 3 to 5 m between head and condenser), favorable to seasonal efficiency.
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Exterior finishing capping (ivory tint), aligned and waterproof, protecting refrigerant lines and power cables.
Condensate management
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Gravity drainage to the outside, with a continuous slope. In balcony environments, we favor a discreet discharge to avoid splashing to the neighbors below; an anti-drip discharge spout is installed.
Protection and service
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Accessible and labeled valves ; rear and side clearances compliant for safe maintenance.
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AirGreen logbook left on site (maintenance plan, service numbers, warranty). This documentation simplifies annual monitoring and condominium inspections.
Power supply
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Dedicated line with protection at the panel according to the intensity of the chosen ZU1, cable fixed under capping, connections in waterproof box. Grounding checked and external disconnector within reach of the technician.
Challenges of a condominium balcony and AirGreen solutions
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Limited space : we choose a compact support, optimized height so as not to hide the window or disturb the neighbors.
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Noise pollution : quiet mode setting for evenings; anti-vibration pads; outdoor fan setting in eco profile.
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Exposure to bad weather : orientation of the unit to avoid air recycling against the wall and promote natural snow removal; stainless steel screws; sealing of penetrations with frost-resistant elastomeric mastic .
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Aesthetics : discreet capping, straight path, hidden screws; the installation fits into Rosemont's iconic red brick facade.
Measurable results after commissioning
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Rapid increase in comfort in air conditioning mode; stability in heating mode without over-oscillations thanks to the inverter.
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Noise perceived on the balcony significantly lower than traditional air conditioners; no vibration felt in the slab.
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Consumption : the user benefits from low-speed modulation for a large part of the year, resulting in energy savings compared to all-or-nothing systems.
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Air quality : Positive user feedback on the indoor freshness attributed to the Plasmacluster during periods of cooking and prolonged occupancy.
AirGreen Recommended HVAC Maintenance
A high-performance system requires regular HVAC maintenance :
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Clean the inner head filters every 4 to 8 weeks during the summer.
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Annual inspection by our technicians: pressure/freon check, electrical tightening, defrost tests, condenser washing, drain pan and slope check.
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Winterization : maintaining snow clearance in front of the unit, removing objects likely to obstruct the air flow.
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Hygiene : treatment of the interior evaporator if odors are present; Plasmacluster technology complements but does not replace maintenance.
Grants and eligibility in Greater Montreal
The recent range R-32 wall-mounted heat pump , with performance in cold climates, may be eligible for current assistance programs according to criteria (power, efficiency, installation by a licensed contractor, primary residence, etc.). At AirGreen, we support customers in Montreal , Laval , Longueuil , North Shore and South Shore to put together files, provide proof of installation and the required approval numbers. We systematically check the alignment of the model and configuration with the current eligible lists.
Good practices and pitfalls to avoid
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Undersizing or oversizing : a 12,000 BTU may be suitable for an open condo area; beyond that, a load study is required. Our consultants validate the thermal load before any order.
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Unnecessarily long line routes : increases pressure losses and fluid volume; we prefer a short, straight route .
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Approximate condensate drainage **: risk of dripping at a neighbor's; we install a discharge spout and, if required, a silent mini-pump .
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Clearances not respected : impairs performance and defrosting; our plans include blower radii and access to the service panel.
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Lack of documentation : the AirGreen booklet remains on site (serial number, maintenance dates, seasonal advice).
What this installation says about our method
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Rigorous site analysis : balcony constraints, access, neighborhood, orientation.
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Clean execution : clean drilling, aligned capping, careful seals, sheathed cabling.
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Fine tuning : optimization of ventilation ranges, calibration of the indoor sensor to avoid setpoint deviations.
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Support : information on HVAC maintenance , winter instructions and support for regional subsidies .
And if you are in Montreal, Laval, Longueuil, North Shore or South Shore
We use the same methodical approach in Villeray plexes, Sud-Ouest condos, Chomedey houses, Brossard semi-detached homes and Terrebonne single-family homes. Our team plans the installation to minimize the visual footprint , protect the facade and guarantee easy-to-access service for years to come.
Quick Facts — Sharp ZU1 (condo type installation)
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Type : single-zone wall-mounted heat pump .
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Refrigerant : R-32 .
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Advantages : inverter , Plasmacluster , quiet mode, high seasonal efficiency.
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Installation : raised support, anti-vibration , waterproof capping , gravity drain.
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Ideal context : apartments/condos with balconies, requirements for silence and energy efficiency .
Conclusion
This HVAC installation in Rosemont–La Petite-Patrie illustrates the combination of a modern Sharp ZU1 and an AirGreen implementation focused on durability , silence , and performance in cold climates . The result: a comfortable condo all year round, controlled consumption, and a preserved facade. Our team covers the entire Greater Montreal area to offer the same quality of work, with clear advice, simplified maintenance , and attentive monitoring.
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
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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).