Installation of a Sharp ZU1 wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Sharp ZU1 in Rosemont–La Petite-Patrie : high head above the window, short connections, gravity drain and anti-vibration brackets. AirGreen delivers quiet comfort and a clean finish for all of Greater Montreal.
Take a tour of the installation
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.
Precise comfort in a Montreal plex, careful aesthetics above a bay window and ultra-compact cooling paths: here we are installing a Sharp ZU1 wall-mounted heat pump in a renovated apartment in Rosemont–La Petite-Patrie , a district of red bricks and leafy alleys where HVAC installation requires as much technique as discretion.
A project designed for the real life of a plex
The owner wanted:
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a rapid cooling for sunny southwest-facing afternoons;
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stable heating in mid-season without using baseboards;
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a low noise level compatible with teleworking;
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a visual integration that respects the carpentry and the day/night blind already in place.
The Sharp ZU1 ( R-32 refrigerant, 12k to 24k BTU versions) is ideally suited to the volume of a typical 5½ semi-open concept Rosemont apartment, with a high-performance envelope and load-bearing brick walls.
Choice of interior layout: height, clearances and blowing
We position the head high under the ceiling , centered in relation to the window lintel, which ensures:
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a free suction above the hood;
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a blowing that runs along the ceiling before descending into the heart of the room;
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easy access to filters for HVAC maintenance .
The motorized shutter directs the airflow slightly beyond the doorway to prevent drafts in the reading area. Vertical vanes distribute air toward the adjoining dining room to reduce temperature differences between zones.
Coordination with carpentry and lighting
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Clearance maintained with the recessed light fixture so as not to disrupt the suction.
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Lateral clearance retained on the door frame side for easy removal of the casing during maintenance.
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White cover aligned with the edge of the head: invisible wiring and drain, clean finish.
Refrigeration path and condensate management
The geometry of the plex provides a brick exterior wall in the immediate vicinity. We have chosen a short route for the insulated copper connections, with:
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clean drilling (≈ 65 mm) with a slight outward slope;
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calibrated flares and torque tightening for a lasting seal;
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high density anti-UV insulation and waterproof caps on the interior side.
The gravity drain is prioritized: regular slope, accessible service siphon , and anti-sag collars. This approach eliminates the noise risk of a pump and facilitates winterization.
Outdoor unit: silence, longevity and neighborhood
At the rear, the outdoor unit is placed on anti-vibration brackets anchored in the structural brick. This choice:
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frees up traffic in the aisle;
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keeps the device away from snow accumulations ;
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limits solid transmission to interior parts.
We scrupulously respect the return and blowing clearances to preserve efficiency and minimize recirculation, which is frequent in the narrow courtyards of Rosemont.
Why the Sharp ZU1 series in Greater Montreal
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R-32 refrigerant : reduced charge and high seasonal performance compared to R-410A.
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Precise inverter : stable setpoint maintenance, ideal for through-plex rooms.
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Acoustics : very discreet low speeds; the device remains compatible with nights with windows half-open towards the alley.
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Diffusion : shutter and sweep multiply the scenarios (cooling directed towards the kitchen, heating towards the TV area).
AirGreen Method: from preparation to commissioning
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Protection of premises: tarpaulins, ribbons, fine suction.
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Identification of networks (electricity, structure, metal edges of the lintel).
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Drilling and waterproof sealing (closed cell foam + vapor barrier).
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Nitrogen test and leak detection with detector.
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Deep vacuum (≤ 500 microns) and controlled hold .
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Opening of the valves then measurements: intensity, delta-T , superheating/subcooling.
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Customer training : seasonal modes, maintenance, economy rules.
Observed performance and obtained comfort
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In air conditioning, the initial delta-T is clear, the temperature drops evenly without “dead zones”.
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In heating, modulation reduces cycles and ensures gentle heat around 20–21°C .
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The perceived noise level near the office area remains very low at Silent speed; the conversation is not covered.
Grants and Eligibility
Recent R-32 wall-mounted heat pumps like the Sharp ZU1 are generally eligible for provincial assistance programs (depending on the BTU capacity and required coefficients of performance). We support our customers in Montreal, Laval, Longueuil, North Shore and South Shore for:
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validate the eligibility of the chosen model;
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compile the file (photos, serial numbers, proof of installation);
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secure processing times .
Tips for maximizing savings
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Maintain the setpoint rather than playing yo-yo; the inverter consumes less in continuous modulation.
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Keep Auto-Fan and sweep on in summer; in winter, tilt the louver slightly downward to break up stratification.
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Ventilate in dehumidification mode during humid heat waves to relieve the feeling of discomfort.
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Wash filters every 4–6 weeks during periods of heavy use; schedule annual HVAC maintenance .
Key technical points of this installation
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Optimized installation height under ceiling with constant clearance for suction.
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Capings match the wall color; no visible sheathing on the room side.
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Insulated gravity drain , with removable trap for inspection.
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Short connections : reduced pressure losses, maximized seasonal efficiency.
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External brackets with neoprene pads and anchoring suitable for solid brick.
Pitfalls to avoid in a Rosemont plex
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Drill into the steel lintel : we move the hole to the sill area, which is safer.
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Forgetting the slope of the drain: cause of odors and overflows.
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Unnecessarily lengthening zigzag connections: loss of capacity, compressor overload.
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Undersize the circuit breaker : we install dedicated protection in accordance with the chosen BTU.
Why AirGreen in Greater Montreal
We combine rigorous sizing , the choice of recent brands (Sharp, Fujitsu, Gree, Midea28 , etc.) and careful execution adapted to local realities: brick buildings, harsh winters, cramped technical spaces. Our after-sales service and maintenance contracts extend performance and peace of mind.
Quick Installation Guide
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Machine : Sharp ZU1 wall-mounted heat pump (R-32), capacity adjusted to the volume of the accommodation.
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Location : Rosemont–La Petite-Patrie, Montreal .
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Route : very short connections, discreet interior cover , gravity drain with siphon.
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Outdoor unit : anti-vibration brackets in the rear yard, standard clearances.
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Objectives : uniform comfort, silence , energy savings, impeccable finish.
The unit on this job, in figures
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 big day, step by step
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 would it look like 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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
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.
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.
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
The on-site estimate is free and the quote follows within 24 hours.
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).