Installation of a Sharp (ZU1 range) wall-mounted heat pump in Côte-des-Neiges–Notre-Dame-de-Grâce
Installation of a Sharp wall-mounted heat pump (ZU1 range) in NDG: invisible path, vacuum draw, precise adjustments. AirGreen carries out careful HVAC installations in Montreal, Laval, Longueuil, North Shore, South Shore for 4-season comfort.
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 neat and invisible installation inside, designed for 4-season comfort in Montreal
At AirGreen , we install HVAC systems that seamlessly integrate into the decor while delivering measurable performance. This project in an apartment in Côte-des-Neiges–Notre-Dame-de-Grâce illustrates our approach: a Sharp wall-mounted heat pump ( ZU1 series) installed high on the wall, flush with a decorative molding, with a fully concealed connection passage. The result: a sleek living room, stable comfort in summer and winter, and efficiency that reduces the load on existing electric baseboards .
Context and objectives of the project
The owner wanted a reversible wall-mounted air conditioner that would heat economically during Montreal 's cold weather and cool quickly during heat waves. His priorities:
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preserve the aesthetics of the living room;
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limit visible drilling;
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achieve quiet and precise temperature operation;
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benefit from an installation eligible for grant programs when the configuration and performance allow it.
On site, the main room features standard height, crown molding, furniture close to the wall, and a potential passage to the outdoors at a short distance. The final location chosen—centered at the top of the wall—guarantees uniform diffusion, unobstructed air return, and easy access for HVAC maintenance .
What sets Sharp's solution apart for an NDG condo
A compact and aesthetic indoor unit
The Sharp wall head (with the characteristic central icon) fits discreetly into the light decor. Its position just below the ceiling molding allows:
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limited stratification of hot air in heating mode;
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efficient air sweeping in air conditioning mode;
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side clearances in accordance with good HVAC installation practices.
The absence of visible trunking inside indicates a passage of connections behind the partition , with an angle calibrated to respect the radii of curvature of the refrigeration tubes. This choice increases visual cleanliness while improving the acoustic insulation of the pipes.
4-season performance and comfort
The ZU1 series heat pump is renowned for its precise inverter control and quiet operation. The tangible benefits for everyday use:
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rapid temperature rise without jolts;
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stable maintenance of the setpoint, even during weather variations;
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significant reduction in consumption compared to baseboards.
In Greater Montreal, a properly sized unit from this family often allows for high seasonal efficiencies and can contribute to the installation's eligibility for financial assistance when the efficiency and low-temperature performance criteria are met.
Technical details and installation finishes
Route of connections and drilling
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Unique drilling on the back of the unit, neat and with controlled slope for condensate drainage.
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Refrigeration connections (insulated copper) and communication cable routed inside the partition then to the outside, avoiding any visible trunking in the room.
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Gravity-fed condensate is preferred when the natural slope allows it; failing that, prepare a discreet location for a silent micro-pump. Here, the wall configuration and installation height make gravity drainage ideal.
Support and protections on the outside (outside the photo)
Even if the photo is of the interior, our standard provides:
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galvanized wall brackets with silent blocks to limit vibrations;
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minimum clearance in accordance with manufacturer requirements;
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white UV trunking on the outside to protect copper, drain and cables;
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service loops and snow guards when orientation and environment require it.
Power supply
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Dedicated circuit according to the intensity of the device, calibrated circuit breaker and safety circuit breaker (disconnect) near the outdoor unit.
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Grounding verified and terminals tightened to the recommended torque for long-term reliability.
Air quality and acoustic comfort
The Sharp head incorporates low-pressure-loss multi-stage filtration and a precise motorized shutter. In practice:
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directed blowing avoids direct air currents on the sofa;
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the low noise level allows for use in the evening without discomfort;
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Filter maintenance, accessible from the front, can be done in a few minutes, which prolongs the performance and cleanliness of the exchanger.
Sizing and calibration
Our team validates the room's thermal load and the housing's orientation. Here, the living room volume and solar gain justify the selection of a typical capacity of 9,000 to 12,000 BTU/h for the main head, depending on the condo's actual heat losses and the presence of adjacent spaces. In heating mode, the unit is configured to limit cycles and maintain the setpoint without overheating, which improves comfort and durability.
Deadlines and progress of work
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Protection of the place (canvases, floor coverings);
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tracing, drilling, installation of the support and the plate;
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tube shaping, flaring, deep vacuum drawing with digital vacuum gauge;
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leak tests, valve opening, powering up;
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commissioning with verification of superheating/subcooling and blowing temperatures;
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explanations to the customer: cleaning of filters, instructions for proper use, reminder of HVAC maintenance intervals.
The presence of a professional stepladder is visible in the photo: the head being placed high, the precision of alignment and compliance with the tightening torques of the connections require a stable and secure workstation.
Result: comfort, discretion and savings
The system provides consistent cooling from the very first minutes and remarkably gentle heating in the mid-season. Baseboards become a useful addition. The interior aesthetics are preserved thanks to the invisible connections, and maintenance is simple: regular dusting of the filters and an annual inspection are sufficient to maintain performance.
AirGreen Tips to Maximize the Value of Your Facility
Good usage practices
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Maintain a stable setpoint rather than increasing temperature variations.
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Clean the filters every 4 to 8 weeks depending on the ambient dust.
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Leave the shutter in automatic sweep to homogenize the temperature.
Maintenance and longevity
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Annual HVAC maintenance by our technicians (inspection, delicate cleaning of the evaporator, drain check, parameter control) prevents a drop in performance.
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Outside: Clear the unit of leaves and snow, ensure free space for heat exchange.
Grants and Eligibility
Depending on the configuration chosen (capacity, SEER2/HSPF2 , cold weather performance), the wall-mounted heat pump may be eligible for assistance programs. Our team verifies these criteria during the submission process and assists in preparing the documents. Customers in Montreal, Laval, Longueuil, the North Shore, and the South Shore benefit from comprehensive support to optimize the net cost of the project.
Why AirGreen
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Impartial advice on the right brand and capacity for the accommodation;
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Exemplary finishes (invisible passages, aligned trunking, careful sealing);
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Compliance with RBQ standards and manufacturing guides;
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Responsive after-sales service, parts and warranty handled straightforwardly.
Common Mistakes Avoided
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Choosing an oversized capacity: more cycles, more noise, less comfort.
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Drill too low: insufficient condensate slope and risk of dripping.
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Forget about outdoor clearances: performance penalized in winter.
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Neglecting deep vacuum: residual humidity harmful to the compressor.
What about multi-room accommodation?
When the need extends to multiple rooms, AirGreen offers MultiZone systems where each head has its own control. The thermal analysis determines the correct BTU mix and the best routing for the connections to maintain a clean interior, as in this NDG installation.
Are you planning an HVAC installation in Greater Montreal? Our team operates throughout Montreal, Laval, Longueuil, the North Shore, and the South Shore , with the same high standards of finish and performance as on this Sharp project. Request your estimate: we size, install, and provide technical support for lasting 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.
More jobs to see, near you
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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).