Installation of a Sharp ZU1 series wall-mounted heat pump in Ahuntsic-Cartierville
AirGreen installs a Sharp ZU1 series wall-mounted heat pump in a bedroom in Ahuntsic-Cartierville: short path, discreet capping, gravity drain and quiet settings for stable comfort all year round.
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The job on one screen
The unit’s data sheet
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 article, chapter by chapter
Precise and discreet comfort in a bright room in the north of Montreal
At AirGreen , we prioritize HVAC installations that truly improve daily comfort while respecting the aesthetics of the rooms. This project in Ahuntsic-Cartierville involves a Sharp wall-mounted heat pump ( ZU1 series ), installed at the top of the wall, near a wooden framed window. The owner's goal is simple: stabilize the temperature of a very bright room, limit the differences between day and night and reduce energy consumption compared to electric convectors.
Context and objectives of the project
The client wants a quiet and responsive solution to ensure:
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a quick refreshment during Montreal's hot periods;
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reliable heating support during the off-season and in the middle of winter;
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careful integration without encroaching on the existing layout.
After taking measurements and surveying the glass surfaces, we selected a heat pump from the Sharp ZU1 family, sized in the 9,000–12,000 BTU range depending on the calculated heat load. This range offers fine inverter modulation, low noise levels and advanced air filtration, ideal for a bedroom.
Interior layout: uniform diffusion and preserved aesthetics
Positioning. The indoor unit is placed high up , on the side wall next to the window. This position allows the airflow to follow the ceiling and reach the entire room evenly, without direct airflow onto the bed. The unit maintains the recommended clearances for air extraction and maintenance.
Finishing. We carefully align the appliance horizontally with the ceiling molding and curtain rod to ensure its presence remains discreet. The Sharp's white facade blends in with the pale gray wall; no decorative accessories are added nearby to preserve air intake.
Route of connections and clean drilling
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Single rear drilling behind the mounting plate (Ø ≈ 65 mm), making the connections inside invisible.
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Short refrigeration line (approximately 2.5–3 m to the outside), which limits pressure losses and improves seasonal efficiency.
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Exterior capping matching the facade, mechanically fixed and sealed to prevent water and air infiltration.
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Bending radius and insulation thickness respected on copper tubes to prevent condensation points.
Condensate management: priority to gravity
The wall configuration allows for gravity drainage with a continuous slope of ≥ 2% towards the outside. We install a non-return valve and a discharge section out of reach of splashes. This approach avoids the use of a lift pump in a bedroom, which reduces noise levels and maintenance.
Power supply and compliance
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Dedicated 240V circuit to the panel, with circuit breaker calibrated according to the appliance plate.
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Outdoor disconnect box near the condenser, in accordance with the Quebec Electrical Code.
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Conductors, grounding and waterproof cable glands checked; routes fixed to eliminate vibrations.
Commissioning: our reliability protocol
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High pressure nitrogen test and leak test (foam test and stability).
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Deep vacuum ≤ 500 microns, maintenance then validation of stable rise, guarantee of a circuit free of humidity.
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Torque tightening of flare fittings to Sharp specification.
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Settings : calibration of shutters, ventilation speeds, night silence mode and automatic restart in the event of a power cut.
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Final checks : blowing temperature, intensity, balancing of the shutters for a smooth sweep along the ceiling.
Results for the client
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Regular temperature at night, without localized over-cooling.
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Significant reduction in consumption thanks to inverter modulation and optimized refrigeration length.
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Quiet at low speed, suitable for bedroom use.
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Air quality enhanced by multi-stage filtration specific to the Sharp range.
Execution details that make the difference
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No visible chute inside; clean feedthrough on back of unit.
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Gravity drain with non-return valve, anti-freeze control and anti-vibration mounting.
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Discreet exterior capping , stainless steel screws and anti-UV seals.
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Respect the clearances around the rod and the curtain to avoid the suction of textiles and micro-noises.
Good practices for use in a bedroom
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Maintain a stable setpoint (20–22°C) rather than frequent variations.
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Orient the shutters in a wide sweep; avoid direct airflow onto the bedding.
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Activate dehumidification mode occasionally during summer humidity peaks.
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Leave free clearance around the unit; do not hang objects or shelves in the recovery axis.
HVAC Maintenance: Simple and Sustainable Plan
Regular HVAC maintenance extends longevity and maintains performance:
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Filters : Vacuum every 4–6 weeks; wash in warm water then dry thoroughly.
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Tray and drain : check the slope and rinse at the start of summer; no obstruction confirmed.
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Exchanger : annual professional cleaning to prevent lamellar fouling.
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Outdoor condenser : clearing of grilles in all seasons (snow, leaves); checking of anti-vibration pads.
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Annual AirGreen visit : supply/return thermometry, electrical check, intensity measurement, tightening and updating of parameters.
Capacity Selection: Our Sizing Method
We take into account:
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of the floor area and the actual volume under ceiling;
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the orientation and solar gains of the window;
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infiltrations and insulation level;
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internal loads (occupants, appliances, lighting).
This approach results in a capacity in the 9,000–12,000 BTU range for a typical bedroom size, with an airflow setting suitable for sleep. The goal is to avoid oversizing (stops/starts, noise) and undersizing (insufficient comfort in hot or cold weather).
Grants and Eligibility
High-performance, certified wall-mounted heat pumps may be eligible for current programs (e.g., LogisVert Hydro-Québec ). We assist our customers in selecting eligible models, providing proof of HVAC installation , and submitting documents in Greater Montreal , including Montreal , Laval , Longueuil , the North Shore , and the South Shore .
Safety and acoustics
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Reduced solid transmission thanks to anti-vibration fixings and compliance with tightening torques.
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Sound level controlled at minimum speed at night; settings recorded upon delivery to the customer.
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Electricity : Dedicated circuit, clear identification on the panel and labeling of the disconnect box.
Pitfalls to avoid in this type of room
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Subsequently drill the wall in the axis of the crossing without prior marking.
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Leave a curtain over the air intake, which disrupts the temperature measurement.
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Repeatedly turn off the power at the circuit breaker; instead, use the remote shutdown to preserve the electronics.
Why AirGreen for your HVAC projects in Greater Montreal
Our team designs, installs and maintains HVAC systems adapted to local climatic realities:
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Accurate diagnosis and clear recommendations;
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Careful execution : clean drilling, watertight seals, discreet exterior capping ;
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Planning that limits the impact on home life;
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Structured after-sales service and HVAC maintenance reminders;
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Coverage of all of Greater Montreal: Montreal , Laval , Longueuil , North Shore and South Shore .
Summary. This Sharp wall-mounted heat pump installation in Ahuntsic-Cartierville delivers consistent comfort, quiet operation, and a clean interior finish. Thanks to the short cooling path, gravity drain , and sleep-friendly settings, the room improves quality of life year-round, without compromising on aesthetics.
The job tools
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.
How the job unfolds
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 we check on a job like this one
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.
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.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
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).