Installation of a Sharp ZU1 wall-mounted heat pump in Plateau-Mont-Royal
In Plateau-Mont-Royal, AirGreen is installing a Sharp ZU1 (R-32) wall-mounted heat pump on brackets with capped connections, compliant clearances, and rigorous commissioning. Four-season comfort and a preserved facade for Greater Montreal.
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.
A clean installation on a brick facade, designed for four-season comfort and urban durability
Just steps from the typical Plateau-Mont-Royal exterior stairs, we are installinga Sharp ZU1 series (R-32) wall-mounted heat pump for a 2nd-floor apartment. The occupants' objective: to efficiently cool in the summer, heat at a reduced cost in the winter and preserve the aesthetics of the brick facade of a Montreal plex. The installation under the balcony, on sturdy wall brackets , and the discreet routing of the refrigeration connections meet the architectural constraints while guaranteeing performance and ease of maintenance.
Customer background and recommendation
The southwest-facing home overheats in the afternoon. Basic electric heating remains energy-intensive in mid-season. We recommend Sharp ZU1 (new generation R-32 ) for its combination of efficiency, reliability, and extreme cold , its fine modulation, and its careful acoustics. The "one head - one zone" configuration optimizes the BTU in the living room and avoids oversizing.
What we have implemented on this site
Supports, anchors and clearances on brick facade
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Galvanized wall brackets sized for the unit load, with anti-vibration pads to decouple the masonry and limit transmissions to the home and neighborhood.
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Chemical anchors in the brick joint, laid according to a spacing pattern which distributes shear and tearing forces.
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Manufacturer-compliant clearances around the condenser (suction/discharge), essential for performance in heat waves and winter defrosting.
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Positioning under a studied balcony : the slab protects against driving rain and vertical snow, while preserving the air flow.
Refrigeration connections: cleanliness, performance and longevity
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Short horizontal run (≈ 6–9 m) to wall penetration; high-density UV-resistant insulation and finishing tape for a neat aesthetic.
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Copper brazing under nitrogen to avoid internal oxidation and preserve heat exchange.
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Nitrogen leak test followed by deep vacuum (micronmeter check) before opening the service valves.
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Waterproof bulkhead with sleeve and masonry-compatible sealant, maintaining the continuity of the vapor barrier inside.
Condensates and electricity
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Gravity drainage of condensate from the indoor head to the outdoors, with controlled slope and frost protection. If this is not possible, we integrate a silent condensate pump with alarm contact.
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Power supply on dedicated circuit from the panel, disconnector in the immediate vicinity of the condenser and communication cable capped and secured; bending radius respected to avoid any interference.
Interior integration: comfort and discretion
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Wall-mounted head positioned high up, centered on the living area for even airflow; calibrated shutters and flow rates to avoid drafts.
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Finishing of the crossings (plate and cap) matching the moldings; passage of the connections behind the furniture for minimal visual presence.
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Optimized sound level via nighttime silent mode and inverter modulation.
Why Sharp ZU1 (R-32) here?
Efficiency and heating in very cold weather
The ZU1 series is designed for the Montreal climate:
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Inverter modulation that maintains a stable temperature and avoids short cycles;
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Reliable heating down to low temperatures, ideal for Montreal , Laval , Longueuil , the North Shore and the South Shore ;
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Next-generation R-32 refrigerant: better seasonal efficiency and reduced charge for the same capacity.
Acoustics and neighborhood
In the backyard, peace and quiet is essential. The ZU1's fan and compressor combination, combined with our anti-vibration pads , limits noise pollution. Neighbors benefit from a contained noise level, even in extreme heat.
Simplified maintenance
Direct access to the service panel, washable filtration on the inside, and clearances respected: everything is ready for quick HVAC maintenance that preserves performance over time.
Key steps in our HVAC installation in Plateau
1) Sizing
Analysis of surface areas, solar gain, insulation, and occupancy habits. We adjust the BTU to cover the summer peak without oversizing the heating.
2) Logistics and site protection
Protection of the balcony and thresholds, securing of ladders, communication with the co-ownership for noise levels and traffic in the courtyard.
3) Drilling and routing
Drilling at the right angle for the drain, controlled slope, sleeve and watertight seal. The connections follow a clean horizontal axis, under UV-resistant insulating sheath.
4) Connections and tests
Brazing under nitrogen, pressure testing , deep vacuum , opening of valves, switching on and checking of intensities, then calibration of remote controls (setpoints, flow rates).
5) Delivery and training
Complete demo: modes (cold, heat, auto, dehumidification), shutter management, filters, saving tips (realistic instructions, programming).
Expected results and benefits for occupants
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Four-season comfort : rapid cooling in summer, efficient heating in mid-season and until the very cold;
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Bills controlled thanks to the inverter and R-32 ;
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Silence inside and out;
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Preserved facade : clean installation, controlled wiring, no unsightly bleeding;
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Easy maintenance : clear access, washable filters, documentation provided.
Practical advice for laying on brick with a balcony
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Choose the location : under a balcony = good weather protection, but check the air clearances and the distance from neighboring rooms.
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Suitable anchors : use brick joints with chemical resin and large washers; avoid light anchors.
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Vibrations : impose skids and chassis balancing ; a cantilevered machine vibrates and makes noise.
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Condensates : positive slopes and outlet outside the passage area; in winter, avoid drips on the stairs.
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Electricity : accessible disconnect switch , dedicated circuit, and properly capped conductors.
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Documentation : Require AHRI numbers, vacuum draw report and proof of pressure test.
Grants and Eligibility
Recent R-32 wall-mounted heat pumps may be eligible for assistance depending on their capacity/efficiency and the program in effect. We review each file, prepare the documents (photos, AHRI , detailed invoice) and support the application to maximize the financial return.
AirGreen: a local and responsive HVAC partner
We operate weekly in Montreal , Laval , Longueuil , the North Shore and the South Shore . Our signature: accurate diagnosis , clean execution , accessible after-sales service . For a Sharp , Gree , Fujitsu or Midea heat pump , we design a solution tailored to your building, your uses and the local climate.
Recommended maintenance (reminder)
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Filters : rinse every 4 to 8 weeks in season.
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Condenser : visual inspection spring/fall, clearance of one meter around.
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Annual visit : electrical checks, condensate test, condition of insulation, updating of parameters.
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In case of unusual noise, persistent frost or odor, turn off the appliance and contact us: early intervention prevents breakdown.
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.
Which type of equipment for your project?
Pick what looks like your need.
Four mistakes we do not make
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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?
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).