Installation of a Sharp ZU1 wall-mounted heat pump in Outremont
Sharp ZU1 wall-mounted heat pump installed in Outremont: discreet design, quiet, R-32 efficiency and gravity drain. AirGreen — HVAC experts for Montreal, Laval, Longueuil, North Shore and South Shore, with support for subsidies and maintenance.
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 careful integration that transforms the comfort of a Montreal condo, while reducing energy bills and ambient noise.
Project context and client objectives
In Outremont, a couple working from home were looking for a quiet, cold- efficient, and stylish HVAC solution for a living room that opened onto an office area. We recommended a Sharp ZU1 wall-mounted heat pump (R-32 refrigerant) , sized to maintain a stable temperature in a multi-use space, with absolute priority given to silence (very discreet interior head) and air quality.
Why the Sharp ZU1 for this condo?
Four-season performance
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Reliable heating in cold weather, with capacity maintenance at low temperatures (extreme cold operating range typical of new generation R-32).
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High efficiency thanks to the DC inverter: the machine modulates finely and avoids energy-consuming on/off cycles.
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R-32 refrigerant with a lower GWP than R-410A, part of a sustainable modernization approach.
Silence and design
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The interior head with its white facade and simple lines blends perfectly into a contemporary decor (framed works, ceiling with recessed lighting).
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Night mode and fan modulation reduce perceived noise, ideal for video conferencing and rest.
Indoor air quality
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Multi-layer filtration and automatic dehumidification functions in summer.
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Precise temperature and humidity management to limit uncomfortable variations in open rooms.
Sizing and capacity selection
Our load calculations (envelope, orientation, glazing, infiltration) led to a selection of 12,000 to 15,000 BTU for the day zone. This range covers the actual need while leaving room for seasonal peaks. On similar projects in Greater Montreal, we observe that oversizing a wall-mounted heat pump degrades comfort (short cycles, drying), hence the importance of precise sizing.
Installation route: precise, clean, durable
Implantation of the inner head
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High position centered under a ceiling recess: optimal clearance for air intake and diffusion, without blowing directly onto the workspace.
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Anchoring on rigid structure, checked at the level to avoid any vibration noise.
Drilling and refrigeration connections
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Single drilling with slight slope for gravity flow of condensates (avoids the pump and its noise).
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Continuous insulated refrigeration lines on 3/8”–1/4” (depending on capacity), brazed and nitrogen pressure tested to ensure leak-tightness.
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High vacuum at the micron pump < 500 microns, maintained under controlled vacuum, then opening of the valves on the condenser side.
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Discreet white interior capping at the exit of the drilling, invisible connections in the living room.
Condensate management
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Gravity drainage, slope verified, anti-siphonage guaranteed. This option minimizes maintenance and eliminates any risk of pump noise.
Electrical integration
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Dedicated circuit with compliant circuit breaker and external disconnect (out of scope of this interior view), shielded communication cable between units, polarities controlled.
Finishes
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Cleaning of the site, leveling of the wall if necessary, complete tests in heating and cooling modes, then calibration of the parameters (sweeping, eco setpoint, timing).
Measurable outcome for occupants
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Stable comfort at 22–23°C without drafts.
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Very low noise in auto speed: comfortable video calls from the living room desk.
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In summer, lower humidity and reduced heat peaks in the late afternoon.
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Anticipated reduction in annual consumption compared to an old electric baseboard heater + window air conditioner combo.
Daily usage tips
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Auto mode with seasonal settings (20–21°C winter, 23–24°C summer) to maximize economy.
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Shutter oriented slightly towards the ceiling to promote induction and homogenize the open room.
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Dehumidification function for humid July/August days to avoid discomfort without overcooling.
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Clean filters every 4–6 weeks during periods of heavy use.
Preventive maintenance by AirGreen
Annual HVAC maintenance extends lifespan and maintains performance:
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Deep cleaning of the evaporator and fan, drainage test.
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Checking of refrigeration parameters , insulation and supports.
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Updated user settings for upcoming seasons.
This maintenance is part of our service plans for Montreal, Laval, Longueuil, North Shore and South Shore .
Grants and Compliance
Recent R-32 wall-mounted heat pumps , with high efficiencies and cold weather performance, may be eligible for provincial and municipal grant programs. We will work with you to assess eligibility (model, capacity, certifications) and handle the paperwork to expedite the process.
Good practices and pitfalls to avoid
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Avoid line extensions without calculation: they harm performance.
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Refuse a condensate passage without a slope: source of overflows and odors.
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Do not stick your head under a narrow ceiling drop: this restricts the airflow.
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Always check access for future maintenance (clearance and access to filters).
And if your space looks like this…
This type of integration is ideal for:
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Condos and plexes with open rooms and sleek finishes.
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Home offices where silence is crucial.
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Montreal buildings with interior walls providing a direct path for connections, allowing for a simple and reliable gravity drain .
Why AirGreen
We are a local team specializing in high-end residential HVAC installation , with in-depth expertise in Sharp, Fujitsu, Gree, Midea and other recent R-32 wall-mounted heat pumps . Our projects are documented, our methods are traceable , and our recommendations take into account your neighborhood , the architecture of your building and your lifestyle.
Technical sheet – intervention summary
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Type : Sharp ZU1 wall-mounted heat pump , new generation R-32 .
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Location : interior wall, high position for optimal diffusion; clearance compliant.
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Drainage : gravity with slope; calibrated drilling.
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Refrigeration : brazing, nitrogen test, micron vacuum , controlled return to service.
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Electrical : dedicated circuit, shielded communication cable, external disconnect (local standards).
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Finishes : discreet capping; sober aesthetic adapted to the decor.
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Service : complete tests, scheduled instructions, usage and maintenance advice.
Next step
Are you planning a similar project in Montreal, Laval, Longueuil, the North Shore, or the South Shore ? We will come and assess the thermal load free of charge, confirm eligibility for assistance , and suggest the best configuration (single or multi-zone). Our goal: lasting comfort, a controlled bill, and integration that respects your decor.
Useful keywords : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .
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.
Useful pages for what comes next
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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).