Installation of a Sharp MultiZone wall-mounted heat pump in Rosemont–La Petite-Patrie
AirGreen installed a Sharp MultiZone wall-mounted heat pump in Rosemont–La Petite-Patrie. An energy-efficient HVAC solution tailored to Montreal duplexes, it ensures comfort in both summer and winter and saves energy for residents.
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The job on one screen
The article, chapter by chapter
An energy efficiency project in a brick duplex in Rosemont
At AirGreen , we recently installed a Sharp MultiZone wall-mounted heat pump system in a typical duplex in Rosemont–La Petite-Patrie , a residential area where brick buildings dominate the landscape. This project illustrates the importance of adapting HVAC systems to the architecture of Montreal buildings while maximizing the interior comfort of occupants.
A thoughtful choice: Sharp MultiZone for complete coverage
The client wanted to equip two separate zones of their home without having to install two separate systems. The solution chosen was a Sharp MultiZone heat pump , capable of powering multiple indoor units from a single outdoor compressor. Benefits include:
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Flexible heating and cooling per room, ideal for multi-story homes.
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Optimized energy consumption , thanks to Inverter modulation.
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Eligibility for provincial and federal subsidies , due to high energy efficiency and heating capacity in extreme cold.
Technical details of the outdoor installation
The brick rear facade provided a sturdy wall, perfect for supporting the two outdoor units mounted on reinforced wall brackets . The installation included:
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Careful drilling, through the masonry, with waterproof sealing to prevent any infiltration.
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Vertical black cappings match the facade, ensuring discreet integration of the refrigeration and electrical conduits.
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A mounting height designed to preserve the safety of equipment in winter, by avoiding snow accumulations and facilitating the flow of condensates.
On-site challenges and AirGreen solutions
The main challenge was the working height , requiring the use of secure platforms to securely attach the compressors to the façade. Our technicians also had to deal with precise drilling in the solid brick, respecting the existing structure and avoiding any cracking.
Particular attention was paid to the insulation of the ducts : double insulation was applied to prevent performance losses in winter and ensure maximum durability.
Results for the client
Upon commissioning, occupants immediately benefited from stable and consistent thermal comfort in both target zones. In summer, the wall-mounted air conditioning system provides constant coolness, while in winter, the heat pump ensures efficient heating even in sub-zero temperatures.
The system not only saves on energy bills, but also contributes to reducing the carbon footprint of the home.
Maintenance and longevity prospects
We recommended to the client an annual HVAC maintenance plan including:
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Checking the refrigerant pressure.
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Inspection of wall supports and sealing of drillings.
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Cleaning of internal filters and inspection of external capping.
These preventive actions ensure optimal performance and extend the life of the system.
AirGreen: HVAC expertise adapted to Montreal realities
This project in Rosemont–La Petite-Patrie perfectly illustrates our expertise: precise installation, aesthetic integration and complete support in choosing an energy-efficient system. At AirGreen, we put our expertise at the service of residents of Montreal, Laval, Longueuil, the North Shore and the South Shore , ensuring lasting comfort and substantial savings thanks to efficient wall-mounted heat pumps .
The job tools
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
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).