Installation of a Sharp ZU1 wall-mounted heat pump in Laval-des-Rapides
AirGreen installs a wall-mounted Sharp ZU1 in Laval-des-Rapides: precise positioning between two windows, gravity drain, and short cooling path for stable and quiet comfort. Greater Montreal HVAC service.
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.
Precise integration between two windows for stable and quiet comfort
At AirGreen , we have just completed the HVAC installation of a Sharp ZU1 wall-mounted heat pump in a home in Laval-des-Rapides . The main room, bright and open, immediately imposes a constraint: two closely spaced windows and a low ceiling that require precise positioning to obtain uniform air diffusion , without the sensation of drafts and without encroaching on the view. Our intervention demonstrates how a recent HVAC solution using R-32 refrigerant integrates smoothly into a residential setting while delivering reliable performance in both hot and cold weather.
Context and objectives of the intervention
The owner was looking for a solution capable of:
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Quickly cool the living/dining area during hot spells.
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Heat efficiently during the off-seasons to reduce dependence on resistive radiators.
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Reduce energy consumption thanks to efficient inverter technology.
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Preserve wall aesthetics and symmetry between openings .
The Sharp ZU1 meets these expectations: high efficiency in winter heating mode, reduced noise level , and control electronics that finely adapt the power to actual demand. Its wall-mounted format facilitates quick, clean and minimally intrusive HVAC installation in apartments and houses on the North Shore .
Location: why above the sill between two windows?
The indoor unit is installed in the upper part , centered between the woodwork. This layout provides several decisive advantages:
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Optimal air circulation : the blown air runs along the ceiling, mixes, then descends naturally; the entire width of the room is swept, including areas near the bays.
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Visual comfort : the device remains aligned with the frames, which lightens its presence in the room.
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Maintenance access : filter and facade accessible without moving furniture.
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Sun protection : The unit does not receive direct sunlight, which reduces unnecessary heating of the temperature sensor.
We also take care to leave the side clearances prescribed by the manufacturer, in order to avoid any air recirculation which would reduce efficiency.
Refrigeration path and condensate evacuation: short, discreet, reliable
Behind the unit, a through-hole was made with a gravity slope for the drain. This choice eliminates the need for a condensate pump, a potential source of noise and maintenance.
The insulated copper lines and the power cable take a very short route (≈ 2 to 3 m) to the outdoor condenser. Inside, a minimalist white capping visually disappears against the gray wall; outside, the connections are capped and continuously insulated against moisture and UV rays.
Outdoor unit: supports, clearances and silence
The condenser is installed on wall brackets in order to:
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stand above the snow line ,
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keep suction and discharge clearances ,
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simplify snow removal in winter and maintenance.
Special silent blocks limit vibration transmission to the masonry. We validate the noise level perceived from the living room and from the outside area on site, while respecting the neighborhood.
AirGreen commissioning: methodology and controls
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Leak test and vacuum draw at measured thresholds.
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Electrical check : dedicated circuit breaker rating, tightening, polarities.
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Setting the shutter to avoid any direct flow onto the occupants and optimize the sweeping of the cold walls (windows).
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Temperature readings (supply/return) and stabilization in cooling and heating modes.
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Training in use : economical modes, humidity management, good HVAC maintenance practices.
Why the Sharp ZU1 is relevant here
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R-32 technology : less climate impact than R-410A with equal performance.
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Cold weather capacity : power maintenance adapted to the climate of Greater Montreal .
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Silence : essential in an open living room.
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Filtration : increased breathing comfort, useful during pollen season.
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Aesthetics : simple, flat facade that blends in with contemporary walls.
This wall-mounted heat pump configuration also remains relevant when the envelope is partially renovated: the continuous modulation absorbs the load variations due to the glazing and solar gains.
Visible details and constructive choices
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Type : wall-mounted heat pump ( mini-split ).
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Brand and range : Sharp – ZU1 .
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Installation : high under ceiling, centered between two windows.
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Drain : gravity , controlled slope.
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Finish : discreet capping , light tint.
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Line length : short to reduce pressure losses and maximize efficiency.
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Anti-vibration mounts : placed under the condenser for quiet operation .
Common pitfalls avoided by our team
Blowing on a cold bay window
We adjust the angle to sweep the glass area without creating stratification or direct air current.
Low ceiling recirculation
The shutter directs the flow parallel to the ceiling for several meters before the natural descent, avoiding pulsations on the occupants.
Flat or counter-slope drain
The drilling is inclined and the passage is continuous to prevent any backflow in summer.
Lines too long
Interior-exterior design with aligned facade to maintain controlled length and a favorable COP .
Grants and savings
High-efficiency wall-mounted heat pumps like the ZU1 may be eligible for financial assistance based on criteria (cold performance, seasonal efficiency, compliant installation). We assist our clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore with preparing the required files and technical documentation .
In operation, the modular heating + efficient air conditioning combination allows significant savings compared to older electric radiators and wall-mounted air conditioners .
Recommended maintenance: maintaining the energy advantage
Annual HVAC maintenance preserves performance and longevity:
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Cleaning the filters and battery.
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Pressure control and inspection of line insulation.
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Checking the drain and condensate tray.
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Electrical measurements (intensities, connections).
We offer scheduled visits before summer or winter to maintain consistent efficiency .
Result and customer feedback
After adjustments, the room quickly reaches the setpoint, without perceptible acoustic effort. In heating mode, the heat is gentle and stable , useful in the inter-seasons; in summer, the humidity level drops and the feeling of freshness arrives quickly thanks to the long, linear flow under the ceiling. The integration between windows respects the interior architecture and frees up the walls for furniture.
AirGreen, your HVAC partner in the field
Our teams operate weekly in Laval-des-Rapides , Chomedey , Vimont , and throughout Greater Montreal . Our promise: accurate diagnosis , careful installation , and clear follow-up . For a living room, master bedroom, or open space, we size the right wall-mounted heat pump and ensure a durable, clean, and aesthetic HVAC installation .
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.
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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?
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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).