Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installs a Sharp ZU1 12,000 BTU in Rosemont: R-32 wall-mounted heat pump , optimized line routing, gravity drain, and custom settings. Four-season comfort and a meticulous HVAC installation for Greater Montreal.
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 Montreal living room that breathes better: our team optimizes the comfort and energy efficiency of an apartment in Rosemont thanks to a careful HVAC installation designed to last.
Project background
In a typical Montreal apartment, the client wanted to stabilize the temperature of the living room and the adjoining open area (TV area + dining room), while reducing his electricity bill. We propose a Sharp ZU1 12,000 BTU (R-32) wall-mounted heat pump , a solution renowned for its heating efficiency in cold weather and its discreet operation. The chosen location — high on the wall, near the bay window — allows for optimal air diffusion without disturbing the aesthetics of the decor (ceiling moldings, frames, rod and curtains).
Why the Sharp ZU1 for this accommodation in Rosemont?
New generation efficiency and refrigerant
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The ZU1 range operates on R-32 , a refrigerant with a lower GWP than R-410A and associated with better heat exchange.
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Smooth inverter modulation: the machine finely adjusts its power, maintaining stable comfort while limiting consumption.
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Low noise level: ideal for a living room where you watch television and chat with family.
Four-season comfort
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Efficient heating in cold weather : the ZU1 maintains good capacity at low temperatures, responding to the climatic realities of Montreal and the North Shore as well as the South Shore .
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Precise air conditioning in summer, with a motorized shutter that directs air under the ceiling, promoting reverse stratification and a homogeneous feeling.
Potential Grant Eligibility
Depending on the home's energy profile and electrical configuration, this type of Energy Star equipment may be eligible for grant programs in Quebec (according to current criteria). We assist our clients in verifying eligibility and preparing documents where appropriate.
Key steps of installation (AirGreen method)
1) Quick study of the room and selection of the wall
We validate the volumes to be treated, the furniture constraints, the presence of curtains and the condensation drainage path. The chosen wall (above the television and between two frames) offers:
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Sufficient upper clearance under the molding for air intake.
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Free air projection towards the living area.
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Direct access to the exterior for a short drilling, minimizing pressure losses.
2) Template, anchoring and drilling
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Place the Sharp template and check the level .
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Fixing the plate to the dowel/structure depending on the type of partition.
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Through hole (≈ 65 mm) with slight outward slope for gravity flow of condensates.
3) Routing of connections and management of condensates
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Insulated copper line set (typically 1/4" + 3/8" for 12 k BTU), communication cable and power supply.
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Estimated final length ≈ 2.5 m to 3.5 m , optimized to avoid unnecessary loops.
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Prioritized gravity drain , avoiding a lifting pump and reducing maintenance.
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Waterproofing and vapor barrier respected when passing through walls.
4) Outdoor unit and finishes
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Installation of the condenser on suitable supports (wall or slab depending on the facade), at a snow-clearing height and with rear clearance for air intake.
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Exterior path with discreet capping matching the facade.
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Vacuum, leak test and valve opening according to manufacturer's procedures.
5) Commissioning and calibration
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Adjust the airflow and louver angles to sweep the entire open area without blowing directly onto the TV area.
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Checking superheat/subcooling and measuring temperature differences in cooling and heating mode.
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Customer advice on usage and programming to maximize savings.
Results measured in housing
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Immediate comfort : the temperature stabilizes quickly, without aggressive drafts.
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Minimal noise : the perceived noise level remains low, even when revving up.
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Aesthetics preserved : the unit fits under the molding and does not encroach on the curtain rod.
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Energy efficiency : the inverter compressor limits peaks, for significant savings compared to a traditional non-reversible wall-mounted air conditioner .
Best practices that we systematically apply
Orientation and airflow
We set the shutter to push the air along the ceiling , then let it fall back down naturally: this strategy avoids the sensation of direct air near the sofa and homogenizes the room.
Curtain and obstacle management
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Clear 20 to 30 cm around the appliance.
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Avoid curtains obstructing the suction or deflecting the jet.
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Position the remote control sensor (if wall-mounted) away from the TV's radiation.
Protection against Montreal winters
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Clear height of the condenser to avoid being submerged by snow.
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Snow shield or awning when the environment requires it.
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Defrosting optimized by sufficient rear clearance.
Electricity and compliance
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Dedicated circuit and appropriate circuit breaker according to the nameplate.
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Communication/power wiring correctly polarized, cable clamps and drip loop respected.
HVAC maintenance: maintaining performance over time
Rigorous HVAC maintenance maintains efficiency and air quality:
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Filters : Gentle vacuuming every month during periods of heavy use; washing with warm water if required.
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Internal exchanger : periodic professional cleaning to prevent fine fouling (dust and biofilms).
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Outdoor condenser : gentle rinse as needed, removal of leaves and dirt.
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Drain : annual inspection to prevent overflows.
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Refrigeration control : verification by our technicians if there is a drop in performance, abnormal frost or error code.
We offer AirGreen maintenance plans adapted to the realities of Greater Montreal ( Montreal, Laval, Longueuil, North Shore, South Shore ) in order to extend the life of your equipment.
Sizing Tips for Similar Pieces
For a living room of 22 to 35 m² in a semi-open area, a 12 k to 15 k BTU wall-mounted heat pump generally covers the needs, to be refined according to:
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Insulation and sealing of the accommodation;
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Orientation and solar gain through the bay window;
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Integration with other areas (open kitchen, hallway);
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The desired set temperatures.
Our assessments are based on thermal load and not on approximate rules per square foot: this guarantees an efficient and quiet installation.
What this installation illustrates about our approach
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Detailed analysis of the room to respect the decor and optimize diffusion.
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Short and clean route of refrigeration lines, reducing losses and noise risks.
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Preferred gravity drain , guarantee of reliability and reduced maintenance.
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Personalized settings (shutters, flow rates, programs) for the customer's daily life.
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Follow-up : seasonal usage advice and maintenance reminder to maintain initial performance.
Express FAQ
Does the ZU1 heat up in very cold weather?
Yes, the range is designed for northern climates and maintains capacity at low temperatures. In case of extreme cold, we recommend keeping a backup heater already present in the home.
What if I want to cover multiple rooms?
We evaluate the relevance of a multi-zone or the addition of a second head. The important thing is to respect the air stratification and the actual circulation paths.
What is the difference with a simple wall-mounted air conditioner?
The wall-mounted heat pump provides heating and cooling . In heating mode, electricity is used to extract heat from the outside air, which is much more economical than resistive heating.
AirGreen, your local HVAC partner
Based in Greater Montreal , we operate daily in Montreal, Laval, Longueuil, the North Shore, and the South Shore . Our promise: meticulous HVAC installation , a selection of new-generation R-32 equipment, and clear support, from quote to maintenance. For a living room that is as comfortable as it is discreet, the Sharp ZU1 is a solid and sustainable solution.
Strategic keywords naturally integrated : 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.
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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).