Installation of a Sharp ZU1 wall-mounted heat pump in Le Sud-Ouest
Sharp ZU1 wall-mounted heat pump installed in Southwest Montreal: head above a passage, short route to the balcony, quiet comfort and savings. AirGreen covers Montreal, Laval, Longueuil, North Shore, 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.
Four-season comfort in a Southwest plex: a Sharp wall-mounted fan carefully positioned above a passageway for optimal air diffusion
Housing context and comfort objectives
In a typical apartment in Southwest Montreal , with a rear balcony overlooking an interior brick courtyard, we installed a Sharp ZU1 series (R-32) wall-mounted heat pump . The client wanted:
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silent cooling in summer,
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efficient additional heating during very cold weather,
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a discreet, clean and easy-to-maintain HVAC installation ,
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a short refrigeration route to limit losses and maximize efficiency.
The layout of the home—central hallway, interior door, and large French window to the balcony—lends itself perfectly to a wall-mounted unit placed high above a door frame . This placement improves air stratification and directs the flow to adjacent rooms.
Equipment selection: Sharp ZU1, new generation R-32
The Sharp ZU1 is part of the recent ranges with R-32 refrigerant, recognized for:
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high efficiency in air conditioning and heating mode,
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improved low temperature capacity (down to −25°C to −30°C depending on capacity),
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a reduced refrigerant load and a better environmental profile,
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very quiet operation both indoors and outdoors.
For this apartment, the typical capacity range of the series (from 12,000 to 24,000 BTU depending on the rooms to be served) meets the needs of a well-insulated 3.5 to 5.5 apartment in Greater Montreal . We validated the thermal loads room by room before recommending the configuration.
Interior layout: above a passage, high ceiling
Why this positioning works
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Air diffusion : placed ~2.1–2.2 m from the floor, the device blows above the passage, which allows the air jet to follow the ceiling and naturally reach the living room through the French window.
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Comfort : reduction of direct air currents on occupants.
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Aesthetics : the head remains discreet in line with the ceiling and does not encroach on the decorative wall space.
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HVAC maintenance : easy access for cleaning filters and dampers.
Visible details and best practices
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Peripheral clearance respected around the facade so that the sensors and air intake operate without obstruction.
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Smoke detector near the ceiling: we systematically check that it is not hidden and that air circulation does not disrupt its operation.
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Adjustable shutter : initial setting towards the living space; a “swing” program is provided to the customer to distribute the air between the corridor and the living room.
Refrigeration path and condensate management
The location, in the immediate vicinity of the French window leading to the balcony, allows for a direct wall crossing with discreet capping (white) and short linear length . Advantages:
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minimized pressure losses,
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neat aesthetics inside,
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gravity drainage of condensate in the majority of cases (slope respected towards the outside).
When gravity is not possible, we integrate a silent condensate pump ; here, the high ceiling configuration makes it possible to avoid this accessory.
External condenser and anti-vibration
On this type of housing with rear balcony , the Sharp condenser is usually installed:
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either on wall brackets with anti-vibration pads ,
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either on floor supports with rubber pads .
We follow clearance rules (rear, sides, front) to ensure airflow and heating performance in cold weather. Connections are continuously insulated, with UV tape and harmonized exterior capping.
Results: measurable comfort and year-round efficiency
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Summer : The Sharp ZU1 unit acts as a high-efficiency wall-mounted air conditioner ; the corridor becomes a natural plenum and the living room benefits from a rapid drop in temperature.
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Mid-season and winter : the heat pump ensures stable heating; the compressor/fan modulation maintains the setpoint silently, while reducing the energy bill.
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Acoustics : The ZU1 series is noted for its quiet operation ; in night mode, the sound pressure is barely perceptible in the corridor.
Instructions for use given to the customer
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Filters : Vacuum/wash every 4 to 8 weeks depending on use.
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Blowing angles : orient the shutter towards the area to be air conditioned; avoid blowing directly towards a curtain or a tall piece of furniture.
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Energy saving : reasonable setpoint (23–24°C in summer, 21°C in winter); take advantage of “eco” and “night” modes.
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Exterior Clearance : Keep the condenser area clear of snow, leaves, and boxes.
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Annual HVAC maintenance : inspection, tightening of connections, pressure check, cleaning of evaporator/condenser.
Grants and eligibilities (Montreal, Laval, Longueuil, North Shore, South Shore)
Recent R-32 wall-mounted , cold-weather heat pumps are generally eligible for current provincial and federal programs (depending on efficiency criteria, climate, and home configuration). We support our clients in:
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check the eligibility of the chosen Sharp ZU1 ,
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prepare documents (quotes, proof of installation),
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submit applications within the prescribed time limits.
Safety, compliance and quality of execution
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Drilling fitted with a vapor barrier and a clean collar on the inside.
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Wiring according to the rules of the art, existing dedicated circuit breaker checked.
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Crawl spaces and cavities avoided; fixings sized for load-bearing walls.
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Tests : vacuum, load checked, leak tests, calibration and commissioning with the customer.
What makes AirGreen different?
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Rigorous sizing : we do not “oversize”; a well-sized, well-placed head heats and cools better.
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Respect for aesthetics : aligned caps , hidden screws, clean drilling.
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Responsive local service throughout Greater Montreal : Montreal , Laval , Longueuil , North Shore , South Shore .
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Follow-up : annual maintenance reminder, parts availability, team trained in the new R-32 ranges.
Key technical points of this installation
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Machine type : single-zone wall-mounted heat pump .
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Brand/series : Sharp ZU1 ( R-32 ).
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Interior layout : above a passage, high ceiling, longitudinal diffusion towards the living area.
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Route : short wall crossing to the balcony; continuous insulation and discreet capping .
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Condensate : gravity drainage with controlled slope.
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Noise : low sound levels, night mode recommended.
Frequently Asked Questions (selection)
Doesn't the head above a door impede airflow?
No. On the contrary, the height allows the air jet to travel along the ceiling and then fall gently, which reduces drafts and evens out the temperature.
Does the ZU1 heat up in very cold weather?
Yes, the series is designed for the Quebec climate ; heating capacity remains available down to -25°C to -30°C depending on the size chosen. In the event of an extreme episode, your main system can take over.
Can I add a second head later?
The ZU1 installed here is a single-zone . To serve multiple rooms, we offer R-32 compatible multi-zone solutions (other series) or the addition of a second single-zone if the electricity and the facade allow it.
Conclusion
This Sharp ZU1 installation in a Southwest plex integrates perfectly with the interior architecture, offers efficient air diffusion and appreciable silence , while preparing the home for year-round energy savings. Our team ensures clean, compliant and sustainable work, with full support for applicable subsidies in Montreal, Laval, Longueuil, North Shore and South Shore .
Need a free estimate? We'll assess your home and suggest the right capacity, location, and a fast installation schedule—always with the meticulous workmanship AirGreen is known for.
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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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).