Installation of a Sharp ZU1 wall-mounted heat pump in Plateau-Mont-Royal
Installation of a Sharp ZU1 on a flat roof in Plateau-Mont-Royal : aluminum trestle, anti-vibration mounts, compact connections and gravity drain . AirGreen execution for Montreal, Laval, Longueuil, North Shore and South Shore. Stable comfort and simplified maintenance.
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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
Clean rooftop, dense neighborhood and co-ownership constraints: here we are signing an exemplary HVAC installation of a Sharp ZU1 wall-mounted heat pump on a flat roof, in the heart of Plateau-Mont-Royal , for a triplex converted into condos where comfort, silence and structural durability are non-negotiable.
The context: a Montreal flat roof and clear rules
On the Plateau , the majority of residential buildings have flat roofs covered with membrane. The co-ownership committees require:
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a discreet integration visible only from the alley;
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impeccable membrane protection ;
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minimal vibrations to keep the lower units quiet.
The client wanted to maintain four-season comfort in a large open-plan living space, with particular attention paid to noise levels and energy savings . The Sharp ZU1 ( R-32 refrigerant, 12k to 24k BTU versions) stood out for its reliability in cold climates and its contained acoustics.
Flat roof installation design and engineering
Support and protection of the membrane
We place the outdoor unit on an aluminum easel resting on treated wooden pads with a large support surface. This assembly:
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distributes the loads so as not to puncture the membrane;
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creates the ground clearance required for defrost water drainage;
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incorporates anti-vibration pads that cut off solid transmission.
A service path is provided for maintenance, with clearances around the machine to ensure optimal air circulation .
Route of the refrigerant connections and the drain
The route is short and direct between the interior head and the roof, via a vertical technical shaft. We retain:
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high density insulated copper connections , bent to the minimum radius;
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UV-stable and waterproof cover up to the outlet cap;
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gravity drain with continuous slope, insulated to limit summer condensation;
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rigorous sealing (closed cell foam + vapor barrier) at the crossings.
Electricity and safety
We install a disconnect switch within visual range of the unit, with the conductor properly sized and grounded. The circuit breaker dedicated to the home's electrical panel meets the selected BTU rating.
Why the Sharp ZU1 on the Plateau-Mont-Royal
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R-32 : reduced load, high efficiency and lower climate impact than R-410A.
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Fine inverter modulation: smooth temperature stability, ideal for open areas .
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Controlled acoustics : helix profiles and envelope limiting the tonal spectrum; valuable in a dense neighborhood.
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Homogeneous interior diffusion : motorized vane and sweep to reach corners despite the partial partitions typical of triplexes.
Installation of the inner head: precise blowing, easy maintenance
The head is positioned high on a light wall , perfectly level , with clearances for easy access to the filter . The orientation of the shutter favors a transverse sweep towards the dining room and the living room. This choice:
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avoid direct draft on the sofa;
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promotes controlled stratification in heating;
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simplifies periodic HVAC maintenance (vacuum filters every 4–6 weeks).
AirGreen Commissioning Procedure
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Nitrogen test and leak detection with electronic detector.
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Deep vacuum (≤ 500 microns) and extended vacuum resistance .
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Opening of valves , superheat/subcooling control.
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Measurement of intensities , delta-T in air conditioning and heating.
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Acoustic profile verified at low speed to ensure the peace and quiet of neighbors.
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Occupant training : seasonal adjustments, filter cleaning, use of dehumidification mode.
Notable technical details of this achievement
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Aluminum easel on treated wood : robust, lightweight, rustproof, suitable for roof maintenance constraints.
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Clearance under the unit: free defrost drainage and prevention of winter icing.
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UV-stable insulation and stainless steel collars : increased longevity despite the Plateau's sunshine.
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Sheathed and sealed electrical paths : protection against water, radiation and thermal expansion.
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White caps aligned** inside: neat aesthetic, without visible cables.
Measured results
In air conditioning, the initial delta-T confirms a rapid drop in the temperature of the open area. In heating mode, the modulation maintains a stable 20–21 °C, without oscillations. The noise level recorded in the adjoining room remains very low thanks to the Silence speed.
Good usage practices
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Prefer to maintain a constant setpoint; avoid sudden variations.
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Keep Auto-Fan and Sweep enabled for even distribution.
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In winter, the shutter should be slightly oriented downwards to better recover stratification.
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Clean filters regularly; schedule annual HVAC maintenance .
Winter management and wind exposure
On a flat roof in Plateau-Mont-Royal , the wind can be strong. We provide:
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Suitable trestle anchors and bracing ;
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Clearances from guardrails to prevent recirculation ;
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Drained defrosting path , without stalactites at the edge of the roof.
These points guarantee reliability at -20°C and during periods of intensive defrosting .
Grants and Eligibility
High-performance R-32 wall-mounted heat pumps like the Sharp ZU1 are generally eligible for Quebec assistance programs subject to performance and implementation conditions. We support our customers in:
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check the eligibility of the selected BTU;
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provide photos and serial numbers ;
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complete the required forms and documents.
Pitfalls to avoid (Plateau feedback)
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Point support directly on the membrane: risk of long-term cracking; hence the easel with pads.
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Poorly insulated drain under kitchen ceiling: droplets and marks; we insulate and siphon .
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Long zigzag connections : load losses; we remain compact to preserve seasonal efficiency.
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Solid-borne vibrations transmitted to the joists: our pads and spacers neutralize them.
Why entrust us with your project in Greater Montreal?
At AirGreen , we are experts in recent brands (Sharp, Fujitsu, Gree, Midea28 , etc.) and new generation refrigerants . Our certified teams deliver HVAC installations adapted to the realities of Montreal, Laval, Longueuil, North Shore and South Shore , with:
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realistic load studies ;
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careful execution and instrumented measurements;
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after-sales service and maintenance contracts that maintain performance throughout the winters.
Quick Installation Guide
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Machine : Sharp ZU1 wall-mounted heat pump (R-32), capacity suitable for open areas.
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Location : Plateau-Mont-Royal, Montreal .
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Assembly : aluminum easel on wooden pads ; anti-vibration; regulatory clearances.
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Route : short connections, watertight cover , insulated gravity drain .
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Objectives : stable comfort, silence , membrane longevity, energy savings.
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).