Installation of a Sharp ZU1 series wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Sharp ZU1 series heat pump in Rosemont–La Petite-Patrie: HVAC installation on brackets, discreet capping, external disconnect switch and reliable performance in winter, carried out by AirGreen.
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.
Careful installation on a brick facade for four-season comfort
At AirGreen , we are working in Rosemont–La Petite-Patrie to install a Sharp ZU1 series wall-mounted heat pump. The typical building in the area— brick facade, wood-paneled openings, and ventilated eaves—requires a precise approach to ensure performance , silence , and durability in the Montreal climate .
Background, device choice and comfort objectives
The owner wants an energy-efficient system that can efficiently heat at low temperatures and evenly cool the main rooms. The Sharp ZU1 series (R-32 refrigerant) meets these expectations thanks to:
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an inverter compressor finely modulating the power;
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reliable heating down to −25°C (depending on capacity);
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improved air quality through multi-layer filtration;
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reduced consumption compared to conventional electric heating.
We offer adapted sizing (9,000 to 18,000 BTU depending on the main room and insulation) as well as flow calibration to limit temperature variations and air currents.
Installation details: precision on a sensitive facade
Wall mount and vibration management
We mount the condenser on galvanized steel brackets above the snow line. Anti-vibration pads reduce transmission to the brick wall and limit resonance inside. The under-eaves installation protects the unit from vertical precipitation while maintaining the required clearances for suction and discharge.
Refrigerant connections and route aesthetics
The refrigeration lines and communication cabling follow a short, straight route , enclosed in UV-resistant grey casing . The bends are arranged to maintain a minimum radius and avoid any stress on the insulated tubes . We ensure penetration into the masonry with a staged drilling , a fire-resistant ring and a brick/wood compatible elastomeric sealant to ensure watertightness and prevent infiltration.
Power supply and safety
Near the unit, we install an outdoor disconnect switch that complies with the Quebec Electrical Code , connected to a dedicated circuit from the indoor panel. Connections are checked to the prescribed torque and identified for easy maintenance. This arrangement allows for quick recording during service interventions.
Condensates and winter period
In cooling , condensate drainage is gravity-driven, with a controlled slope to prevent stagnation near the window frame. In winter defrosting , the clearance under the unit prevents ice from accumulating on the masonry. If necessary, we provide a discreet deflector to channel the flow away from passage areas.
Measured results and benefits for the client
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Stable comfort in living rooms, without overheating or jolts thanks to inverter control .
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Minimal exterior noise : the anti-vibration mounting and the position under the eaves reduce perception from the courtyard side.
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Optimized consumption : the heat pump covers the majority of heating needs during the off-season and into the heart of winter, which lowers the overall bill.
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Clean finish : the gray capping blends in with the brick and woodwork, while protecting the connections.
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Easy maintenance : direct access to the disconnector, clearances respected, service points cleared.
What we systematically check on this type of site
Integration into architecture
We favor short lines that are consistent with the lines of the facade. The fixings in the brick are made with suitable anchors , and the joints are properly repaired for a durable finish.
Cold performance
The ZU1 series maintains high efficiency at low temperatures; we validate the refrigerant charge (when additions are required depending on the length of the lines) and the superheat/subcool during commissioning to guarantee efficiency in Montreal winters .
Indoor air quality
On the indoor unit side, we educate the customer about HVAC maintenance : periodic cleaning of filters , annual inspection of the battery and fan , checking of drains and the hood to maintain the nominal flow rate and air purity .
Practical advice for owners in Montreal, Laval, Longueuil, North Shore and South Shore
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Installation height : on the facade, aim for sufficient clearance for snow and defrost , without sticking the condenser to the soffit.
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Mechanical protection : Consider a snow guard or screen if the unit is located under an ice fall zone.
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Energy saving : for heating, program a stable setting (e.g. 21°C) and avoid frequent variations which put unnecessary strain on the compressor.
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Annual maintenance : professional cleaning of the external battery and checking of the connections ensures longevity and maintains the advertised COPs .
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Grants : depending on the configuration and effectiveness chosen, the project may be eligible for current programs (e.g. LogisVert ). We support our clients in preparing files for Montreal, Laval , Longueuil , North Shore and South Shore .
Why choose AirGreen for a Sharp installation on a brick facade?
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Local HVAC expertise : we understand the realities of Montreal plexes and old facades.
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Technical rigor : tightening torques, flaring, deep vacuum , nitrogen leak test and parameter control during commissioning.
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Aesthetics and durability : choice of capping , anchors , pads , and finishing of seals to resist freezing and thawing.
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After-sales service : maintenance, scheduled maintenance reminders and availability of Sharp parts through our distribution network.
Key steps in our installation process
1) Technical visit and sizing
Survey of areas, orientation , insulation, windows, electrical and anchoring constraints. Selection of BTU capacity and optimal location.
2) Preparation and anchoring
Installation of brackets , level check, installation of buffers and verification of the wall's load-bearing capacity. Protection of the work area and woodwork.
3) Connections and wiring
Production of flared fittings to the prescribed torques. Installation of insulated sheaths , routing under capping with radii respected. Pulling of the communication cable and power supply to the disconnector .
4) Vacuuming and testing
Deep vacuum (< 500 microns), leak testing and refrigerant release. Monitoring of pressures , currents , air temperatures and superheat/subcooling .
5) Customer training
Explanation of modes , heating/air conditioning instructions, filter maintenance, winter precautions and HVAC maintenance schedule.
What the customer gains in Rosemont–La Petite-Patrie
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Immediate and consistent comfort ;
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Energy bill controlled all year round;
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Facade preserved thanks to clean and reversible integration;
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Peace of mind thanks to certified installation and AirGreen monitoring.
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?
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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).