Installation of a Sharp wall-mounted heat pump on a flat roof in Plateau-Mont-Royal
On a flat rooftop in the Plateau-Mont-Royal neighbourhood, AirGreen installed a Sharp Eco Inverter wall-mounted heat pump for an urban condominium. With its raised mounting brackets, optimized airflow, and easy maintenance, it offers a discreet, high-performance solution perfectly suited to Montreal's climate.
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.
For this project in the Plateau-Mont-Royal neighbourhood , our team was tasked with modernizing the heating and air conditioning system of a condominium building located on a typical Montreal street, with flat roofs and unobstructed city views. The goal: to provide year-round comfort while reducing energy consumption, all with a clean, durable, and discreet installation.
We recommended and installed a Sharp wall-mounted heat pump , Eco Inverter range, a system recognized for its reliability, energy efficiency and quiet operation, perfectly suited to the dense urban context of the Plateau.
Project context: an urban condominium on a flat roof
The building is a condominium with several units , with the available space primarily on the roof. As is often the case in Plateau-Mont-Royal, the challenge is twofold:
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Limit noise for the occupants and the neighborhood;
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Preserve the aesthetics of the building, visible from the neighboring roofs and terraces.
The chosen solution was a flat-roofed installation of the Sharp condenser, connected to indoor wall units in the apartments. This type of configuration completely frees up facades and balconies, while providing excellent airflow around the equipment.
Choosing the Sharp Eco Inverter wall-mounted heat pump
For this project, we installed a Sharp Eco Inverter wall-mounted heat pump , from the same family as the high-performance Sharp ZU1 series, known for its efficiency in heating and cooling mode.
The advantages of the Sharp system for this customer
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Inverter technology : the compressor finely modulates its speed, ensuring stable comfort, fewer temperature variations and reduced energy consumption.
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Quiet operation : an essential criterion on a roof shared between several dwellings; noise is minimized for immediate neighbors.
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Improved air treatment : Advanced filtration technology (including Ion Plasmacluster air treatment visible on the unit) contributes to better indoor air quality.
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Four-season reliability : the heat pump provides summer cooling and supplementary heating in the off-season , thus relieving the main appliances and reducing energy costs.
A flat roof installation designed to last
1. Sharp condenser on raised supports
The Sharp outdoor condenser has been installed:
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On raised metal supports , securely anchored;
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With anti-vibration pads under each foot, visible in the photo, to reduce vibrations transmitted to the structure;
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At a sufficient distance from other devices on the roof, in order to optimize air circulation and facilitate maintenance.
This approach ensures excellent mechanical stability and protects the equipment against the accumulation of water or snow on the roof.
2. Careful management of refrigeration lines
The refrigeration lines and electrical cables were:
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Protected in sheaths designed for outdoor use;
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Transported in an orderly fashion onto the roof, respecting the existing slopes;
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Securely fixed to prevent any friction or excessive movement in the wind.
This attention to the piping helps to extend the life of the system and reduce the risk of premature breakdowns.
3. Accessibility for maintenance
The chosen location leaves:
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Sufficient clearance in front of the condenser grille for future maintenance;
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A safe passage for AirGreen technicians during seasonal maintenance.
The result is a system that is easy to inspect, clean and maintain, which reduces service costs in the long run.
Performance and comfort in Montreal's climate
In Plateau-Mont-Royal, temperature variations are significant: humid heat waves in summer, and persistent cold in winter. The Sharp Eco Inverter wall-mounted heat pump is perfectly suited to this environment.
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In summer , it provides efficient air conditioning for the main rooms, maintaining a pleasant temperature even during periods of intense urban heat.
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In spring and autumn , it provides very economical supplementary heating , allowing the main systems to be switched on later and reducing the energy bill.
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In winter , the Sharp heat pump contributes to indoor comfort on milder days, while remaining an ideal complement to existing heating systems.
Thanks to Inverter modulation, the system avoids frequent starts, which improves comfort, increases the machine's lifespan and reduces electricity consumption.
A clean, safe and discreet construction site
On this flat roof, typical of the Plateau-Mont-Royal, it was essential to:
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Minimize visual clutter ;
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Ensure that the loads on the roof are properly distributed;
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Respect clearance and safety standards around equipment.
Our installers worked in coordination with the condominium association in order to:
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Confirm the location of each condenser;
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Plan a secure passage for future access;
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Leave the work site clean, without debris or unnecessary exposed cables.
The result: a clean, professional installation that blends perfectly into the urban environment of the Plateau.
Why entrust your Sharp project to AirGreen?
At AirGreen, we support our clients in Greater Montreal – including Plateau-Mont-Royal – in all their Sharp wall-mounted heat pump projects:
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Needs analysis : type of housing, insulation, solar exposure, lifestyle habits;
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Recommendation of the right Sharp model (Eco Inverter range, ZU1, etc.) depending on the rooms to be air-conditioned and the desired performance;
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Professional installation on exterior wall, balcony, backyard or flat roof as in this project;
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Comprehensive after-sales service : maintenance, cleaning, performance checks, diagnostics in case of problems;
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Advice on available subsidies when the project is part of an eligible energy efficiency program.
Our goal: to offer our customers lasting comfort , optimized energy consumption and an installation they can be proud of, both from a technical and aesthetic point of view.
Conclusion: A Sharp heat pump perfectly suited to the Plateau-Mont-Royal area
This Sharp Eco Inverter wall-mounted heat pump installation on a flat roof in the Plateau-Mont-Royal borough perfectly illustrates what we do every day at AirGreen: adapting technology to the realities of Montreal. Between demanding climates, architectural constraints, and close neighbors, every detail counts.
If you live in Plateau-Mont-Royal or elsewhere in Greater Montreal and you wish to:
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Replacing an old air conditioning system;
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Add a high-performance wall-mounted heat pump;
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Optimize your comfort while reducing your energy costs.
We will be happy to advise you and offer a Sharp or other brand solution tailored to your situation.
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.
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.
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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).