Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installs a Sharp ZU1 on a balcony in Rosemont–La Petite-Patrie: wall-mounted heat pump , raised support, short connections and gravity drainage for lasting comfort throughout Greater Montreal . ≤275 characters.
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.
An exemplary HVAC installation on a Montreal balcony, designed for performance and discretion
At AirGreen , we are installing a Sharp wall-mounted heat pump (ZU1 series) in the heart of Rosemont–La Petite-Patrie . The context: a typical Montreal plex with a brick facade and a narrow balcony overlooking the backyard. The client's objective was clear: four-season comfort , low noise , optimized consumption , and careful integration without encroaching on the outdoor living space.
Why the Sharp ZU1 for this residential project?
We direct the owner to the Sharp ZU1 , a recent wall-mounted heat pump operating on R-32 refrigerant (lower GWP than R-410A), ideal for the Montreal climate.
Major advantages of the ZU1:
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Continuously modulated DC inverter for high efficiency and mid-season savings ;
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Stable heating in extreme cold (operating range adapted to Greater Montreal winters);
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Reduced noise levels inside and out, perfect for a balcony shared between neighbors;
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Filtration and dehumidification functions for improved air quality in summer;
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Frequent eligibility for energy efficiency programs when combined with good installation and maintenance practices.
Needs analysis and sizing
We carry out our thermal assessment taking into account:
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of the housing surface and orientation;
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of the envelope (brick walls, recent woodwork);
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seasonal solar gains;
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of the occupation profile .
Conclusion: a capacity of 12,000 to 18,000 BTU depending on the rooms served, with margin for heat peaks and winter troughs . The ZU1 series covers these ranges with ease, while limiting short cycles.
Design of a clean and durable installation on a balcony
Choice of support and management of clearances
The outdoor unit is placed on a raised aluminum support , mechanically anchored. This choice:
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protects against standing water and blown snow ;
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maintains clearances in accordance with the manufacturer's recommendations to ensure air circulation ;
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separates the machine from the slab to reduce vibrations and preserve the comfort of the neighborhood.
Anti-vibration pads are integrated into the base for quiet operation .
Safe and accessible electricity
In the immediate vicinity of the unit, we install an outdoor disconnect box (emergency cut-off), waterproof and within easy reach for maintenance. The dedicated circuit from the housing panel is sized according to the nominal load of the ZU1 , with 240 V protection and grounding in accordance with the Canadian Electrical Code .
Route of refrigeration connections and sealing
The wall passage is short and straight (approximately 1.5 to 2.5 m of connections), ideal for:
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limit pressure losses ;
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reduce the risk of fluid noise ;
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facilitate future maintenance .
We seal the penetration with expanding foam and an insulating sleeve , ensuring air and moisture tightness . The passage is discreetly capped for a clean finish on the brick.
Condensate management
The configuration allows for gravity drainage to the exterior, simplifying maintenance and eliminating the risk of overflow associated with a pump. The slope is verified and water-tested to ensure consistent flow in air conditioning mode.
Key steps of our AirGreen method
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Site preparation : balcony protection, load-bearing check, clearance check with respect to the railing and walls.
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Installation of the support : tracing, drilling, mechanical anchors, fine leveling .
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Wall crossing : controlled drilling, vapor barrier and peripheral insulation .
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Installation of connections : nitrogen brazing, pressure leak test , deep vacuum .
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Electrical connections : polarity test, torque tightening, functional tests.
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Commissioning : setting the fan curve, calibrating the interior shutters, checking the blown temperatures .
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Customer training : maintenance, seasonal instructions, reminders on filters and clearances around the condenser.
Concrete results obtained
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Even cooling of the living room and adjacent rooms, with controlled air currents thanks to the Inverter mode and directional shutters;
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Effective supplemental heating on cool spring and fall mornings, reducing the load on the main system;
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Very low perceived noise on the balcony and at neighbors, even at full load;
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Aesthetic finish respecting the exposed brick, without invasive conduits.
Best practices and pitfalls to avoid on a Montreal balcony
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Do not glue the unit to the ramp : provide the necessary space for air intake and maintenance accessibility.
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Avoid undersized fasteners : favor a structural support designed for dynamic loads and freeze/thaw cycles.
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Take care to seal the drilling: prevent infiltration and thermal bridges .
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Keep the area clear in winter : no objects or benches obstructing the suction/discharge; de-icing as needed.
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Respect the noise constraints of co-ownership: the silent inverter helps, but the location remains decisive.
HVAC Maintenance: The Key to Long-Lasting Performance
We offer an annual AirGreen maintenance plan :
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cleaning of coils (int./ext.), fans and filters ;
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electrical control (tightening, intensities) and refrigeration (superheating/subcooling);
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inspection of the drain and the hood ;
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seasonal performance test to confirm yields.
Regular maintenance secures energy savings , extends lifespan and maintains stable comfort .
Grants, compliance and support
The Sharp ZU1 is part of today's energy-efficient initiatives. We guide our customers in Montreal, Laval, Longueuil, the North Shore, and the South Shore to:
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eligibility verification (provincial/municipal programs and distributor offers);
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certificate of installation by RBQ contractor and compliance with CCQ requirements;
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the required documentation (detailed invoices, serial numbers, installation photos).
Technical data sheet - installation highlights
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Equipment type : Sharp single-zone wall-mounted heat pump , ZU1 series , R-32
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Target capacity : 12k–18k BTU (depending on room load)
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Exterior installation : raised aluminum support , anti-vibration, compliant clearances
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Refrigeration path : short (≈ 1.5–2.5 m) , brazing under nitrogen purge, deep vacuum
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Power supply : 240 V on dedicated circuit , waterproof disconnection box on balcony
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Condensates : gravity drainage with validated slope
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Waterproofing : sealed crossing (foam + insulating sleeve), discreet cover on brick
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Acoustics : mechanical separation, controlled vibration, silent operation
What our customers appreciate about AirGreen
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Rigorous engineering and impeccable finish , even in tight spaces;
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Transparency on sizing and selection of equipment (brands Sharp, Fujitsu, Midea, Gree, Lennox, Bosch , etc.);
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Clear deadlines , proactive communication , and after-sales service available;
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Respect for co-ownerships and neighborhoods, from delivery to commissioning.
Ready for your project in Montreal and surrounding areas?
Whether you're in Rosemont–La Petite-Patrie , Villeray , Le Plateau , Laval , Longueuil , on the North Shore or the South Shore , our team provides reliable, stylish, and compliant HVAC installations . We evaluate your home, recommend the best heat pump for your budget, and ensure commissioning that delivers on its promises— comfort, savings, and peace of mind .
At AirGreen, we deliver a clean, efficient, and sustainable result—from the first bolt to the first degrees of comfort.
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).