Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie. AirGreen offers an elegant, quiet, and efficient R-32 interior installation, designed for the climate of Greater 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.
A careful interior installation that maximizes comfort, silence and efficiency
At AirGreen , we recently installed a Sharp ZU1 wall-mounted heat pump in a renovated home in Rosemont–La Petite-Patrie . The client's goal was clear: to achieve four-season comfort , quiet operation , and superior air quality in an open-plan living space, without compromising the interior's sleek aesthetic. This project exemplifies our approach: rigorous sizing, precise positioning, and meticulous commissioning—all designed for the Greater Montreal climate.
Housing context and performance criteria
The unit serves an open living room-kitchen area with central circulation. We chose a 12,000 BTU model from the ZU1 series for its fine modulation in mid-season and its ability to maintain stable performance down to −25 °C . The ZU1 offers:
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Inverter compressor with wide modulation range to avoid on/off cycles.
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R-32 with low GWP, meeting new environmental requirements.
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Advanced filtration and ionization (Sharp's own Plasmacluster technology) for a fresher air sensation.
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Class-leading efficiencies ( high SEER , advantageous HSPF ), guaranteeing energy savings in Montreal, Laval and Longueuil.
Interior positioning: science of airflow and respect for clearances
The comfort of a wall-mounted heat pump depends as much on the model as on the quality of the positioning . We have:
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Center the wall head on a clear section, at the optimal height under the ceiling , so that the air jet runs along the ceiling and gently descends into the occupied area.
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Ensure the recommended side and top clearances to avoid any recirculation of hot/cold air.
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Aligned the unit with recessed lighting and architectural lines to maintain the minimalist aesthetic of the room.
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Checked the absence of obstacles (beam fall, partition corner, metal upright) on the blowing radius to maintain a very low noise level and homogeneous distribution.
Result: the air is diffused away from the occupants , without the sensation of a direct draft, while still reaching the kitchen area — a key point in open spaces.
Condensate management: gravity-based, simple and reliable
In air conditioning mode, condensation water management is crucial. We have designed a gravity drainage system :
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Continuous slope to the exit point to eliminate any risk of stagnation.
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Insulated and protected tube at cold passages to prevent parasitic condensation.
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Accessible service hatch for periodic maintenance (rinsing the tank and drain).
This approach avoids the use of a lifting pump (noise, maintenance) — an advantage for quiet accommodation in Rosemont.
Refrigeration connections and aesthetics of the hood
Performance depends on well-executed refrigeration connections :
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Short and clean route , with a single main drilling, in order to limit pressure losses and optimize seasonal efficiency.
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Controlled bends , continuous high-density insulation and careful sealing at the crossings.
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Inside, there is no visible sheathing: the line is perfectly integrated ; outside, the finishing cladding harmonizes with the facade for a discreet finish, acceptable to the condominium association.
Power and interconnection: security and compliance
We installed a dedicated circuit from the panel, with protections adapted to the system's nameplate. The interconnection cable between the two units complies with the required polarity and gauge, and grounding is checked at each stage. This care guarantees the durability of the electronic components and stable operation in extreme cold.
Sealing, vacuuming and commissioning: the AirGreen signature
The difference comes during commissioning:
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Nitrogen pressure test to confirm the integrity of the braze joints.
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Deep vacuum draw to a low and stable level, proof of a dry and watertight network.
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Complete functional tests (heating and air conditioning), verification of blowing temperatures , balancing of fan speeds , and sound level control.
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Setting useful functions: automatic restart , anti-cold air draft mode in heating, and sweep settings to cover the entire living room.
Real comfort and air quality
In daily use, the customer benefits from:
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Remarkably quiet at low revs—ideal for home office and movie nights.
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Rapid temperature rise in winter thanks to the fine management of the inverter.
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Improved air quality through ionization technology, which reduces persistent odors and suspended particles.
Energy savings and subsidies
By replacing or supporting traditional electric heating, a properly sized wall-mounted heat pump can generate substantial savings throughout the year. The ZU1 series ' performance makes it eligible for Quebec's grant programs , subject to each program's criteria. We support our clients in Montreal, Laval, Longueuil, the North Shore , and the South Shore in these efforts.
Recommended HVAC Maintenance: The Simple Plan That Makes the Difference
To maintain performance:
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Clean filters every 4 to 8 weeks (more frequently if there are animals).
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Annual inspection by our technicians: evaporator, fan, condensate tray, probes, electrical tightening, gentle cleaning of the coils, and control of the gravity drain .
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Checking exterior cowlings , supports and snow clearances when winter is in full swing.
Regular HVAC maintenance maintains efficiency, limits consumption and extends the life of the equipment.
Common Mistakes…and How We Avoid Them
Our team systematically prevents the following pitfalls:
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Undersizing (9k units put to the test of a large open area) or oversizing which results in short-cycling .
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Installing too close to the ceiling or a beam drop, causing air recycling and stratification.
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Drain without slope or not insulated, source of odors and overflows.
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Refrigeration lines that are too long or poorly insulated, which reduce efficiency.
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Lack of dedicated circuit and appropriate protection.
Each AirGreen installation includes a quality control check to validate these points before delivery to the customer.
Result: consistent comfort, clean lines, lasting value
The Rosemont customer now enjoys consistent comfort , controlled consumption and an impeccable interior , with the wall-mounted head fitting perfectly into the white decor and recessed lighting. The Sharp ZU1 is a solid choice for anyone looking for a high-performance, quiet wall-mounted heat pump that's ready to take on the winters of Greater Montreal .
AirGreen, your HVAC partner in Greater Montreal
We design and build HVAC systems that respect the reality of each home: architecture, noise, aesthetics, budget, and climate. Need a study for your condo or plex in Montreal, Laval, Longueuil, on the North Shore or the South Shore ? We are ready to help you .
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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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).