Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
Sharp ZU1 wall-mounted heat pump installed in Rosemont: wall brackets, white cover, electrical disconnection and complete commissioning. 4-season comfort by AirGreen in 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.
The clean and quiet solution that transforms a Montreal condo, without compromising on aesthetics or performance
Client context and objectives
At AirGreen , we were called upon to modernize the comfort of a condo located in Rosemont–La Petite-Patrie . The client was looking for a robust, low-consumption wall-mounted heat pump capable of providing stable heating in winter and precise cooling in summer, while integrating discreetly into a typical Montreal brick facade. We recommended a Sharp ZU1 series (R-32) , known for its consistent performance in cold weather and its air quality thanks to Ion/Plasmacluster technology.
Why the Sharp ZU1 for Greater Montreal
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Energy efficiency : inverter compressor that finely modulates power, limiting on/off cycles and reducing consumption peaks.
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Extreme cold : stable operation down to −25°C , ideal for Montreal winters.
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Air quality : Plasmacluster filtration and ionization that reduces dust and allergens for superior daily comfort.
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R-32 refrigerant : more thermodynamically efficient and with reduced global warming potential compared to R-410A.
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Silence : optimized external fan and silent blocks that effectively cut vibrations on masonry.
Site reading and execution plan
The installation is on the 2nd level of a brick plex. The main constraints:
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Significant working height and limited access to the alley: use of a lifting platform and establishment of a safety perimeter.
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Preservation of aesthetics : refrigeration connections and wiring route entirely covered in a horizontal white casing , then vertical up to the unit.
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Snow and Snow Removal : Outdoor equipment is mounted on high-clearance galvanized wall brackets to stay above accumulations and facilitate maintenance.
Technical details of the installation (what you see in the photo)
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Support : galvanized steel brackets, mechanically anchored in the brick with sieve and chemical sealing; laser leveling.
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Decoupling : anti-vibration pads under the chassis to eliminate noise transmission to the structure.
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Route : approximately 4 linear meters of insulated copper connections + communication cable, protected by a white cover which aligns under the balcony railing for clean integration.
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Power supply : outdoor disconnect box (local disconnect) in the immediate vicinity; dedicated circuit to the indoor panel according to CSA/CE standards.
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Condensate management : gravity drainage to the outside, with controlled slope inside the hood.
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Drilling : ø65 mm brick wall penetration with sheath , urethane foam and vapor barrier to ensure watertightness.
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Protection : Anti-drip loops and UV collars to preserve the insulation of the connections over the seasons.
Commissioning and quality controls
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Nitrogen test at 550 psi, held for 30 minutes to validate the seal.
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High vacuum < 300 microns and stabilization to remove residual moisture.
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Load compensation according to actual link length, in accordance with Sharp specifications.
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Calibrations : validation of superheating/subcooling , current and voltage measurements, verification of defrosting in heating mode.
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Customer commissioning : demonstration of modes, programming, basic maintenance and operating advice during cold weather.
Result: measurable comfort and impeccable facade
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Even heating in the living area, without drafts.
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Minimal perceived noise on the facade and in the neighborhood, including in defrost mode.
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Neat aesthetics : the cover follows the architectural line; invisible wiring and copper.
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Simplified access for HVAC maintenance : clearance around the unit complies, accessible disconnection and robust mounting.
Operating advice for Montreal, Laval, Longueuil, North Shore and South Shore
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Continuous heating mode : let the inverter modulate; avoid frequent switching on.
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Defrosting : normal phenomenon below −10°C; keep the area clear of snow .
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Internal filters : Light rinse every 4–6 weeks; ionization works best on a clean filter.
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Clearances : Maintain 30–45 cm of clearance around and under the appliance in winter.
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Programming : use time slots to smooth consumption during peaks (useful on the North Bank and South Bank where peaks can be charged).
Recommended maintenance (preserve performance and warranty)
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Annual visit by our AirGreen team: coil cleaning, refrigerant measurement, electrical tightening, condensate test.
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Every 2–3 years : gentle washing of the outdoor condenser with clean water (in spring), inspection of the covers and the feedthrough seal .
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After storms : visual inspection of supports and clearances; our oversized brackets, however, minimize the risk of buckling.
Grants and Compliance
High-efficiency wall-mounted heat pumps like the Sharp ZU1 are often eligible for financial assistance when programs are active . We validate eligibility for you at the time of submission (Montreal, Laval , Longueuil , North Shore , South Shore ) and prepare the required documents. Our installation complies with current electrical standards , service clearances and good vacuum and testing practices.
What makes the AirGreen difference
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Local HVAC specialists , accustomed to plexes and access constraints in urban environments.
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Impeccable finishes : aligned hoods, clean seals, clean condensate management.
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Complete support : choice of capacity (9,000 to 24,000 BTU depending on the room), installation advice, maintenance and priority after-sales service.
Do you have a similar project?
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we size and install the wall-mounted heat pump that corresponds to your reality (surface area, orientation, insulation, desired noise level). Request a free evaluation : we move from recommendation to a clean, safe and sustainable HVAC installation , like this Rosemont–La Petite-Patrie project.
Express FAQ
Which power should I choose?
For an open area of 25–35 m², 12,000 BTU is often adequate; for 35–50 m², aim for 15–18 kBTU . We confirm after a visit, as insulation and sunlight influence the calculation.
What if I don't have gravity drainage?
We integrate a quiet condensate pump with matching shroud, without compromising aesthetics.
My neighbors are worried about the noise.
The Sharp ZU1 and our anti-vibration mounts maintain very low noise levels. The elevated positioning keeps the sound away from the floor and nearby windows.
Do you need a permit?
Depending on the city/district, a permit or approval may be required for facade installation. We will guide you and provide the necessary technical specifications.
In summary
This Sharp ZU1 wall-mounted heat pump installation in Rosemont–La Petite-Patrie illustrates our approach: precise sizing , careful installation on brackets , discreet cladding , accessible electrical disconnection and rigorous commissioning . The result: 4-season comfort and preserved aesthetics , ready to last.
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
By town, by equipment or by region: browse more than 4,700 published projects.
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).