Installation of a Fujitsu wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Fujitsu wall-mounted heat pump on a flat roof in Rosemont by AirGreen. A high-performance HVAC solution eligible for subsidies in 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.
An optimized HVAC installation on a flat roof in an urban environment
At AirGreen , we regularly work in Montreal buildings with flat roofs, where installing a Fujitsu wall-mounted heat pump requires specific expertise. In this project located in Rosemont–La Petite-Patrie , our team installed a complete system to provide four-season comfort to occupants, while taking into account the constraints of a dense urban environment and a gravel roof typical of Montreal plexes.
Context and needs of occupants
The building, which consisted of several apartments, had a common problem: increasingly hot summers and harsh winters leading to high electricity bills. The residents wanted a solution:
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Energetically efficient,
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Silent inside,
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Resistant to Montreal's winter conditions,
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Eligible for government grant programs.
The Fujitsu wall-mounted heat pump has established itself as a strategic choice, thanks to its stable performance down to -26°C and its Energy Star certification.
Steps and technical details of the installation
Our intervention was divided into several phases:
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Fixing outdoor units on flat roofs
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The Fujitsu capacitors were placed on raised supports made of treated wood and metal rails , avoiding any direct contact with the gravel.
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This method ensures better durability and reduces the risks associated with the accumulation of rainwater or ice.
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Routing of refrigerant pipes
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The pipes were grouped together and routed neatly along the roof, protected by insulated covers to prevent energy loss.
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A discreet passage was created to reach the interior units via a wall opening, while maintaining the roof's watertightness.
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Condensate management
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Thanks to the natural slope of the roof and a well-designed gravity installation, no lifting pump was required, thus reducing future maintenance costs.
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Securing against climatic conditions
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The outdoor units have been oriented to maximize air circulation and avoid backdrafts.
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Regulatory clearances have been respected to ensure optimal operation even in the event of accumulated snow.
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Challenges encountered and solutions provided
One of the major challenges of this project was the limited roof space shared by multiple HVAC systems. To avoid interference:
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We have arranged for precise alignment of capacitors.
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Each device was installed on its individual support, ensuring stability and ease of future maintenance.
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Particular attention has been paid to soundproofing, so as not to disturb the occupants or the immediate neighbors.
Results obtained
Thanks to this installation, Rosemont residents now benefit from:
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Stable thermal comfort all year round ,
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From a reduction in their energy costs ,
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From a system that meets performance and safety standards,
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An enhancement of their accommodation through the presence of modern and reliable equipment.
The discretion of the Fujitsu system, both inside and out, helps improve the quality of life without altering the aesthetics of the building.
Grants and savings
The project is eligible for several grant programs, including:
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The provincial LogisVert program,
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The federal Greener Homes initiative.
We supported residents in their efforts, enabling them to reduce the net cost of installation while increasing the profitability of their investment.
AirGreen expertise in Greater Montreal
With this installation in Rosemont–La Petite-Patrie , AirGreen once again demonstrates its ability to carry out complex projects in urban environments. Whether you live in Montreal, Laval, Longueuil, on the North Shore or the South Shore , we put our expertise at your service to ensure optimal and lasting comfort, supported by the best brands of heat pumps.
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).