Installation of a Sharp ZU1 series wall-mounted heat pump in Westmount
Installation of a Sharp ZU1 series wall-mounted heat pump in Westmount: short run, gravity drain, anti-vibration and precise commissioning. AirGreen, HVAC installation experts in Montreal, Laval, Longueuil, North Shore and South Shore.
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.
Client context and objectives
In a bright Westmount apartment, our client wanted a quiet heating and air conditioning solution that would perform well in Montreal's winter and blend seamlessly into the decor. The space to be treated is a 4.5-room apartment typical of masonry buildings in the area, with a south-facing bedroom and an open-plan living room. The priorities were clear: stable comfort , controlled consumption , careful aesthetics , and fast work without disrupting the neighborhood.
Why a Sharp wall-mounted heat pump (ZU1 series) ?
Sharp's ZU1 series (next generation refrigerant) meets the needs of an urban condo:
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High heating efficiency even in very cold weather, ideal for our winters.
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Fine inverter modulation : the machine only supplies the energy needed, limiting on/off cycles.
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Very low noise levels inside and out — an asset in a condominium in Westmount, Montreal .
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Available sizes : 12,000, 15,000, 18,000 and 24,000 BTU, allowing capacity to be adjusted to the actual heat load.
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Next-generation refrigerant reducing climate footprint and delivering improved seasonal efficiency.
Load study and capacity selection
Before any installation, we carry out a room-by-room sizing (orientation, glazed surfaces, waterproofing, ceiling height). Here, the building envelope is sound and the windows are recent, the load of the sleeping area is moderate. A 12,000 BTU unit was chosen for the bedroom and the adjoining corridor, with the possibility of extending the system later to the living room if desired.
Interior integration: precision and discretion
The indoor unit is installed high under the ceiling , centered on the load-bearing wall to cover the entire room. Some notable execution points:
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Technical clearances respected to ensure air circulation and maintenance access.
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Refrigerant connections are routed to the right of the unit, with a discreet cover that matches the walls. The crossing is made with a single 3" opening with an insulated sleeve to prevent thermal bridges.
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Condensate drainage by gravity , controlled slope, which eliminates potential pump noise and limits maintenance.
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Power supply and communication cable secured in the ducts, without visible cables.
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Careful finishing : reworking of the peripheral joint and end-of-site cleaning — the installation visually blends into the room.
Outdoor installation: respect for co-ownership
The compact and quiet condenser is installed on the stage side, on anti-vibration wall brackets with neoprene pads. We have:
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Validated the location with the union to respect the distances to the limits , the minimum height in relation to the snow and the flow of water .
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Provided rear clearance for air sweeping and simplifying defrosting operations.
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Added a lightweight snow shear above the unit to protect the exchanger during winter accumulations.
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Created a short refrigeration line (≈ 2.5–3 m), optimizing efficiency and reducing pressure losses .
Electricity and commissioning
Our certified electricians installed a dedicated circuit breaker on the existing panel and a proximity switch on the condenser. Commissioning followed our protocol:
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Vacuum with a micronmeter until a stable pressure is reached.
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Nitrogen leak test .
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Opening the fluid then checking for overheating/undercooling .
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Calibration of the probes and testing of the different modes (heating, air conditioning, dehumidification, ventilation).
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Adjust the slats to direct the airflow without direct draft on the bed.
Result: uniform comfort, imperceptible noise
From the first hours, the temperature stabilizes in the 21–23°C range, with better controlled humidity in summer. The perceived noise level in the room remains below the ambient background—perfect for sleeping. In terms of bills, the ZU1's modulation allows for measurable savings compared to electric convectors. In mid-season, the Heat Pump mode covers all the heating needs of the area.
Aesthetics and ergonomics of use
Sharp's matte white facade and clean lines complement the apartment's light tones. The remote control and app allow for:
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the weekly schedule ,
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consumption monitoring ,
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anti-frost scenarios and night lowering,
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management of motorized shutters to avoid drafts.
Preventive maintenance: the key to performance
To maintain seasonal performance and air quality:
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Clean filters every 4 to 6 weeks during peak periods.
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Annual AirGreen inspection : check of tightening, gentle washing of the exchanger, verification of condensate and line insulation.
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Clearing the condenser in winter (de-sludge the grilles if necessary) and maintaining a free perimeter of 45 cm around it.
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Software update if available (depending on the chosen connectivity).
Local Grants and Programs
In Greater Montreal (including Laval , Longueuil , North Shore and South Shore ), certain new-generation wall-mounted heat pumps , efficient at low temperatures, may be eligible for incentives depending on the programs in effect and the energy profile of the home. We assist our clients in verifying eligibility and preparing documents (detailed invoices, proof of installation, performance data).
What we paid particular attention to in this project
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Reduced line length and direct route: better COP and fewer losses.
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Gravity drain without pump: increased reliability and zero parasitic noise.
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Anti-vibration devices sized for the building's masonry: no structural transmission.
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Finishing touches : aligned covers, clean drilling, controlled slope, repainting around the plate.
Practical AirGreen tips for a condo in Westmount, NDG, Ville-Marie or Outremont
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Size correctly : an oversized unit dehumidifies less well and increases the number of short cycles.
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Think about positioning : aim for through diffusion, avoid blowing towards a nearby obstacle.
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Plan for winter : protect the condenser (height, flow) and leave clearance.
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Plan maintenance : an annual contract costs less than losing efficiency over several seasons.
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Look at scalability : a second head can, if necessary, complete the comfort of the living room while keeping a single compressor.
Why AirGreen
We specialize in residential and multi-unit HVAC installations in Montreal , Laval , Longueuil , the North Shore and the South Shore . Our method combines thermal diagnostics , impeccable implementation and administrative support (grants, condominium insurance documents). Each project is delivered with inspection photos , personalized settings and usage tips to maximize comfort and savings.
Frequently Asked Questions (excerpt)
Can this Sharp ZU1 series heat up in the middle of winter?
Yes, the series is designed to provide efficient heating in negative temperatures, with capacity maintenance that is attractive for our climate.
What noise inside?
In steady state, the noise level is very low , often below the ambient noise of a quiet room. The location and balancing of the shutters also play a role.
How long does the installation take?
In an existing condo with a direct route, one day is generally sufficient for installation, electricity, vacuuming and commissioning.
What if I want to pilot remotely?
Connected functions allow energy programming and monitoring from a smartphone.
Conclusion
With this Sharp wall-mounted heat pump (ZU1 series) installed in Westmount, we deliver a sober, quiet and elegant system. The result: four-season comfort and better controlled bills , without compromising on aesthetics or the peace and quiet of neighbors. For a similar project in Montreal , Laval , Longueuil , on the North Shore or the South Shore , our team guides you from study to commissioning - and well beyond, thanks to rigorous HVAC maintenance .
How it goes, from the first call to the end
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 the unit delivers when it is cold
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.
And 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.
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.
Which type of equipment for your project?
Pick what looks like your need.
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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).