Installation of a Sharp ZU1 wall-mounted heat pump in Plateau-Mont-Royal
Plateau-Mont-Royal Salon: Sharp ZU1 wall-mounted heat pump installed high up, rear-wall penetration, gravity drain , nitrogen testing and deep vacuum . Quiet comfort and even diffusion. AirGreen, the benchmark HVAC installation in Greater Montreal.
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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
Discreet comfort and controlled diffusion in a Montreal living room with careful aesthetics
Project context and objectives
In an apartment in Plateau-Mont-Royal , we are installing a Sharp ZU1wall -mounted heat pump (new generation with R-32 refrigerant). The living space is characterized by a decorative wall with a plant motif, a minimalist pendant light and a full-height curtain: a configuration where integration and diffusion quality are as important as energy performance. The client wanted a silent system, capable of providing precise cooling in the summer and comfortable additional heating in the spring and fall, without compromising the aesthetics of the living room.
Why the Sharp ZU1 for this Plateau show?
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High seasonal efficiency thanks to inverter technology and R-32 fluid (low GWP) ensuring good air conditioning and heating performance in cold Montreal weather.
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Careful acoustics : reduced noise level at low speed, ideal for an open living room where people talk, read or work.
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Even diffusion : motorized shutters and blowing geometry promoting the Coandă effect for even distribution, without direct air currents towards the sofa.
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Clean design : smooth white housing and discreet logo match the light finishes and ceiling moldings.
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Easy maintenance : wide-opening front, accessible filters, ideal for quick and regular HVAC maintenance .
This performance/aesthetics combination perfectly meets the requirements of apartments in Greater Montreal , where visual space and calm are as important as efficiency.
Interior layout: millimeter precision and shortest route
Positioning the wall head
We fix the mounting plate high on the wall near the curtain, respecting the Sharp clearances to the ceiling and sides. This placement:
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allows the air jet to travel along the ceiling before gently descending into the occupied area;
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prevents the curtain from disturbing the air intake;
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frees up space and storage around the chest of drawers.
Drilling, crossing and evacuation
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Drilling behind the wall as short as possible, oriented with a slope of 2 to 3° towards the outside to ensure gravity drainage of condensates (without lifting pump: silence and reduced maintenance).
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Waterproofing on the exterior side (mastic + vapor barrier sleeve) to eliminate air infiltration and thermal bridges .
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Discreet interior rosette for a clean finish around the bushing.
Refrigeration connections and power supply
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Continuously insulated 1/4"–3/8" refrigerant line , shortened length to stay within the ZU1's optimal range.
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Inter-unit communication and power cable with the line for a minimalist look.
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Connection of the outdoor condenser to a dedicated circuit breaker , in accordance with the Canadian Electrical Code; grounding verified.
AirGreen Method: a documented and measured HVAC installation
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Flares made to the recommended torque and visually checked (no cracks, clean lips).
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Nitrogen pressure test on the entire circuit to validate the seal.
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Deep vacuum (< 500 microns, stabilization and recovery) to remove moisture and non-condensables.
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Setting of modes, shutter sweep and speeds adapted to the geometry of the living room and the proximity of the curtain.
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Final measurements : return/supply temperatures, intensity, superheating/subcooling, verification of noise level in steady state.
These steps ensure seasonal performance, compressor reliability and full warranty validity .
Construction site challenges and technical solutions
1) Proximity to a full-height curtain
The curtain can disrupt the recovery and cause local recirculation. We respect sufficient lateral clearance and direct the sweep so as to project the air along the ceiling, away from the textile, to maintain a smooth recovery and homogeneous diffusion .
2) Aesthetics of a decorative wall
The presence of a large plant visual requires a clean and symmetrical installation. We align the facade with the room's landmarks (molding, light fixtures), install a neat rosette and conceal the path so that the head blends into the decor.
3) Gravity drain without pump
Choosing a controlled slope and an ultra-short route eliminates the need for a lift pump. The result: silence , reduced risk of odors, simplified HVAC maintenance .
Concrete results: comfort, silence, savings
Upon commissioning, the Sharp ZU1 quickly stabilizes the setpoint ; the inverter modulation reduces on/off cycles and maintains a regular temperature .
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In air conditioning , the dehumidification function improves perceived comfort during humid episodes on the Plateau.
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As additional heating , the blowing remains warm even when the nights get cooler, limiting the use of more expensive resistive devices.
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The visual footprint remains small: the smooth casing blends into the decor and allows free movement around the furniture.
Good practices for HVAC use and maintenance
Daily use
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Maintain a stable setpoint (e.g. 22–23°C) to allow the inverter to modulate effectively.
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Leave the shutters on auto-sweep to promote uniformity; adjust the direction if someone is sitting under the flow.
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In summer, use Dry mode when humidity peaks; in mid-season, use Heat mode at a low speed for gentle comfort.
Recommended maintenance
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Filters : clean every 4 to 8 weeks depending on use.
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Heat exchanger/fan : annual deep cleaning to prevent biofilms and odors.
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Drain : check the slope and watertightness, especially after moving furniture or painting.
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Refrigeration connections : inspection of the external insulation and sealing; control of functional parameters by our technicians.
Regular HVAC maintenance maximizes durability and preserves seasonal performance.
Advice from our construction sites in Montreal , Laval , Longueuil , North Shore and South Shore
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Avoid excess piping lengths : each additional meter adds losses and can increase refrigerant noise.
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Take care with alignment near curtains and light fixtures: a head that is too close sucks in the fabric and creates turbulence.
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Respect the clearances around the intake and the blowing to prevent dead zones .
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Ensure the slope of the drain : a single missing degree can be enough to trigger an overflow on very humid days.
Grants and Compliance
Recent R-32 wall-mounted heat pumps , which are efficient in cold conditions, are generally eligible for Quebec energy efficiency programs. We assist our customers in preparing the file (proof of installation, serial numbers, photos, detailed invoices). All our installations comply with the electrical and safety standards applicable in Greater Montreal.
Why entrust your HVAC installation to AirGreen?
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Local expertise : hundreds of condo and plex installations in the Plateau, Rosemont, NDG and beyond.
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Rigorous procedures : nitrogen, deep vacuum , instrumented measurements, clear reports.
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Finishes : short paths, careful sealing, discreet integration inside and out.
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Sustainable monitoring : HVAC maintenance plans, usage advice, assistance in heat waves and severe cold.
Project sheet – Plateau-Mont-Royal (summary)
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Type : single-zone wall-mounted heat pump .
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Brand / Range : Sharp ZU1 (R-32).
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Location : high wall, clearances respected, close to a curtain without interference.
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Crossing : rear wall, gravity drain with 2–3° slope, interior rosette and exterior seal.
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Refrigeration path : very short , continuous insulation.
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Commissioning : nitrogen test, deep vacuum , setting of flaps and speeds, final measurements.
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Benefits : silence, stability of instructions, preserved aesthetics, reduced operating costs.
Ready to optimize your comfort?
Whether you are in Plateau-Mont-Royal , Laval , Longueuil , on the North Shore or the South Shore , we size and install the right solution: heat pump , wall-mounted air conditioner , multi-zone , or interior systems (cassette, console, ducted). Our teams manage the study, installation and HVAC maintenance , with clear support for subsidies.
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).