Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
In Rosemont–La Petite-Patrie, we install a Sharp ZU1 wall-mounted heat pump ( R-32 ) with a short path and gravity drain: comfort, silence and savings, with careful finishing and HVAC maintenance . Serving Greater Montreal (Laval, Longueuil, North Shore, South Shore).
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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
Four-season comfort, without compromising on aesthetics or efficiency: that's exactly what we just offered a household in Rosemont–La Petite-Patrie thanks to the installation of a Sharp ZU1 wall-mounted heat pump . This project illustrates our expertise in HVAC installation in Montreal plexes, where compactness, silence, and performance in cold weather make all the difference.
An intervention designed for the daily life of a Montreal plex
In this housing unit, the living area (kitchen and dining room) overlooks a small covered gallery typical of the neighborhood. We position the interior head above the windows, about 20 cm from the ceiling, in order to make the most of the Coandă effect: the treated air stretches along the ceiling, mixes more quickly and ensures uniform comfort all the way to the adjacent rooms. This height also frees up the doorways and avoids obstructing the opening of the doors.
The through-hole is made on the wall facing the gallery. The condensate drain operates by gravity , with a continuous slope to prevent any backflow. Outside, the refrigerant path is short (approximately 1.5 to 2 m), covered in a discreet capping matching the woodwork. The condenser is fixed on wall brackets above the snow line: this configuration, classic in intramural Montreal , protects the equipment, prevents ice accumulation and facilitates winter maintenance.
Why the Sharp ZU1 for Rosemont?
The Sharp ZU1 series (new generation R-32 refrigerant) is distinguished by:
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extreme cold operation adapted to Greater Montreal winters (down to approx. −25°C to −30°C depending on capacity);
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fine power modulation that maintains a stable temperature without jolts;
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a very low noise level, ideal for open living rooms;
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reliable and easy-to-maintain electronics, with easily accessible filters.
This combination of performance/silence/compactness is perfectly suited to the Rosemont–La Petite-Patrie plexes, where both performance and discreet integration are sought.
Sizing and actual comfort
We size the heat pump based on the actual volume to be treated, the amount of sunlight, the quality of the insulation, and the occupants' usage. In this case, the room benefits from good solar gain during the day: we calibrate the capacity to cover winter needs without oversizing for the summer, which avoids short cycles and preserves the compressor's longevity. The result: a rapid temperature rise in the morning and gentle, quiet cooling during heat waves.
Electrical connections and compliance
The system is powered by a dedicated circuit breaker installed by our partner master electrician, with certified cable and differential circuit breaker according to the unit's capacity. The external seals are made with a polyurethane sealant resistant to freeze/thaw and UV. Each tightening is checked by dynamometer ; a nitrogen test then a deep vacuum (≤ 500 microns) are carried out before opening the fluid. This rigor guarantees the lasting tightness of the refrigeration circuit.
Condensate management: gravity rather than pump
From the design stage, we prioritized gravity condensate drainage. It's quiet, reliable, and maintenance-free. The slope is checked using an electronic bubble and protected by an insulated sheath to prevent condensation on the interior finish. A condensate pump remains a backup option for complex configurations, but here the wall-gallery layout makes it possible to do without it... and eliminate a potential source of noise.
What the customer gains: comfort, savings and peace of mind
Year-round comfort
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In heating , continuous modulation ensures a stable temperature even during icy gusts; the shutters direct the flow under the ceiling then towards the dining area, without direct air current on the occupants.
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In air conditioning , the dehumidification mode maintains a pleasant humidity level during the hot and stormy days of July and August.
Operating yields and costs
The ZU1 range, with its inverter compressor and R-32 , offers very good seasonal coefficients of performance . In use, the customer significantly reduces their mid-season heating costs and relieves their main system during very cold weather, while benefiting from economical air conditioning in the summer.
Grants and Eligibility
New generation high-performance wall-mounted heat pumps (R-32/R-454B) are generally eligible for current Quebec programs (e.g., Hydro-Québec LogisVert initiatives) and certain federal components when performance and installation criteria are met. We assist our clients in verifying criteria, preparing files and providing proof of installation.
Simplified HVAC Maintenance
A well-installed system means simplified HVAC maintenance : easily accessible washable filters, recommended seasonal cleanings, and inspection of exterior connections. We provide the customer with a clear maintenance schedule and operating instructions (louver orientation, fan speeds, auto/eco modes) to extend the unit's lifespan.
AirGreen Site Challenges and Solutions
Interior aesthetic constraint
The main wall, highly visible and colorful, required clean integration: we chose an ultra-short layout with an exit directly behind the unit and an exterior passage aligned with the gallery uprights. Inside, there is no visible cover; outside, a discreet line cover follows the joinery.
Montreal winter and frost
Snow accumulation is common on the rear façade. The outdoor unit is therefore raised on galvanized brackets, with sufficient clearance for frost drainage in defrost mode. The location remains accessible for maintenance, without hindering traffic on the gallery.
Noise management
The ZU1 is naturally silent, but we go further: silent blocks adapted to the unit's weight, controlled tightening, and verification of possible resonances with the guardrail rail. The result: barely perceptible operation both inside and on the roof rack.
Best practices that we systematically apply
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Layout : Always think about the actual airflow of the occupants (table, sofa, route to the kitchen), not just the volume.
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Drilling : constant outward inclination, waterproof sheath, hydrophobic insulation.
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Refrigeration lines : bending radii respected, no mechanical stress on flare fittings, butyl tape at sensitive points.
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Electricity : dedicated circuit, panel identification, capacity margins in accordance with manufacturers.
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Final checks : superheating and subcooling measurement, control of supply/return temperatures, setting of shutters and user briefing with the customer.
Advice for owners of a plex in Rosemont, Villeray or HoMa
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For a comparable open area, a properly sized wall-mounted heat pump covers 70–90% of the annual heating needs of a well-insulated urban home.
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Place the interior head high and centered over the living area; avoid blowing directly towards obstacles (thick curtains, tall elements).
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In winter, leave the fan speed on Auto : the system modulates better and you save money.
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Schedule a professional cleaning every 12 to 24 months; kitchen dust and grease reduce yields and increase consumption.
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If your condenser is located on a deck, maintain a 30 cm clearance around it and clear snow from under the unit during storms.
Why AirGreen?
We understand the realities of Montreal buildings : double walls, narrow galleries, harsh winters, and tight neighborhoods. Our HVAC teams work cleanly, explain each step, provide the required documents for grants , and remain available after installation. From quote to initial commissioning, our promise is simple: tangible comfort, measurable savings, and integration that respects your living space.
And for you?
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we offer tailor-made solutions: Sharp ZU1/ZHU1 , Fujitsu Orion/Altair, Midea28 ( R-454B ) and the new Gree series in R-32 . Our role: to advise you honestly, install impeccably and ensure HVAC maintenance that extends performance over time.
Conclusion
This installation of a Sharp ZU1 in Rosemont–La Petite-Patrie illustrates an approach where technology serves comfort: short distances, gravity evacuation, snow-free support, extensive testing, and meticulous finishing. This is the AirGreen signature: performance intelligently integrated into everyday Montreal life.
Naturally integrated keywords : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .
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).