Installation of a Sharp ZU1 wall-mounted heat pump in Southwest Montreal
AirGreen installed a Sharp wall-mounted heat pump in Southwest Montreal, with an outdoor unit mounted under the deck , anti-vibration dampers, and a neat electrical connection. An ideal solution to maximize comfort, reduce noise, and protect the equipment from Montreal winters.
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.
In the Southwest borough, backyards and metal-framed terraces are commonplace: limited space, brick walls, close neighbors… and yet, people want impeccable comfort year-round. For this project, our AirGreen team installed aSharp wall-mounted heat pump ( Eco Inverter series, with Plasmacluster technology), opting for a clean, quiet, and sustainable installation perfectly suited to the Montreal urban environment.
The photo shows the Sharp outdoor unit mounted high on wall brackets under a deck, with anti-vibration mounts and a neat electrical connection. This is exactly the type of installation we prefer when we want to protect the equipment from the elements (snow, ice, leaves, splashes) while still allowing reasonable access for maintenance.
Why choose a Sharp wall-mounted heat pump in an urban environment?
A wall-mounted heat pump is often the most logical solution for homes in the Southwest, because it:
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It heats efficiently for much of the winter.
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It cools quickly during periods of heat and humidity,
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offers a stable temperature thanks to inverter technology (the compressor modulates instead of constantly starting/stopping),
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remains discreet when properly installed (vibrations and noise controlled).
And with Sharp, we add an element that many customers appreciate: Plasmacluster technology, combined with an approach focused on comfort and perceived indoor air quality (especially when the house is closed up during cold periods).
The installed system: Sharp Eco Inverter – Sharp ZU1 compatible model
The visible markings (“ SHARP ”, “ ECO INVERTER ”, Plasmacluster badge) and the condenser format correspond very well to a Sharp wall-mounted heat pump from the ZU1 series (R-32), frequently used in residential settings for its balance between performance, silence and efficiency.
When the exact number is not 100% legible on the plate, we remain consistent with the manufacturer's actual range and the type of installation observed, in order to describe the project credibly and professionally.
Key installation details: a placement designed for stability, snow, and consideration for the surrounding area.
This photo shows several typical elements of a well-executed AirGreen installation in an urban environment.
1) Installation on wall brackets (heightening)
Installing the outdoor unit on the wall , rather than on the ground, offers concrete advantages in Montreal:
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better protection against accumulated snow and ice,
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less dirt (leaves, mud, splashes),
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reduction of the risk of the heat exchanger becoming blocked in winter.
This is particularly relevant under a terrace, where floor space is precious.
2) Anti-vibration shock absorbers (blue pads)
The anti-vibration pads under the unit are clearly visible. It's a detail that makes all the difference:
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vibrations greatly reduced
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Less noise is perceived inside.
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Improved comfort for the customer… and for the neighbors.
3) Installation under a terrace: protection… but air management is mandatory
Under a metal structure, you benefit from a certain protection (direct rain, vertical snow accumulation), but you must respect an essential rule: ensure sufficient air circulation .
Our approach at AirGreen is to:
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validate the clearances around the unit,
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avoid “enclosed” areas that trap air,
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maintain viable access for maintenance and inspections.
4) Clean electrical connection with dedicated box
An electrical box (disconnect switch/service box type) is visible nearby. This is important because:
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security,
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maintenance,
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compliance and ease of future intervention.
5) Drainage and de-icing management (Quebec winter)
Even if you can't see all the drainage details in a single photo, a wall installation always involves consideration of:
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defrost water (prevent it from falling back into the wrong place),
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ice formation beneath the unit,
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the protection of surfaces and passageways in winter.
In practice, the aim is an installation that remains functional even during the freeze/thaw cycles typical of Montreal.
Our AirGreen method: what makes the difference in the long term
A high-performing heat pump is good. A heat pump that performs well for years is even better. To achieve this, we focus on:
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Intelligent location selection (air quality, noise levels, accessibility, aesthetics),
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solid supports + upgrades (often overlooked, but crucial),
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rigorous refrigeration connections (vacuuming, sealing),
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commissioning with actual checks (stability, noise, vibration).
It is this level of rigor that avoids unpleasant surprises in the heart of winter.
What the customer gains on a daily basis
After this type of installation, the feedback is generally very concrete:
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a more comfortable home, without sudden changes,
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rapid cooling in summer (especially in sunny rooms),
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a feeling of calm (outdoor unit better controlled in terms of vibrations),
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Simpler use: the heat pump becomes “invisible”, it does its job.
Maintenance tips (simple, but costly)
To maintain the performance of a Sharp and extend its lifespan:
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Clean/maintain the indoor unit filters regularly.
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Keep the outdoor unit clear (of snow, ice, leaves).
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plan a complete periodic maintenance (pressure, inspection, performance, supports).
An inverter heat pump can continue to operate even if it's not as efficient… but you often pay for it in terms of comfort and energy consumption. Regular maintenance ensures the machine stays in top condition.
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.
Four mistakes we do not make
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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).