Installation of a Fujitsu wall-mounted heat pump on a flat roof in Hochelaga-Maisonneuve
Installation of a Fujitsu wall-mounted heat pump on a flat roof in Hochelaga-Maisonneuve. AirGreen provides expert HVAC service for Montreal, Laval, Longueuil, North Shore, and South Shore.
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.
A heat pump installation adapted to Montreal’s flat roofs
At AirGreen , we recently completed a Fujitsu wall-mounted heat pump installation on a flat roof in the Hochelaga-Maisonneuve area. This neighborhood, known for its residential and commercial buildings, often requires HVAC solutions tailored to flat roofs exposed to Montreal's extreme weather conditions.
Installing a heat pump on a snow-covered roof presents a unique challenge: a sturdy raised support, secure routing of refrigerant lines, and adequate protection against snow and ice accumulation are required.
Why choose a Fujitsu heat pump in Hochelaga-Maisonneuve?
The Fujitsu wall-mounted heat pump is renowned for its reliability, high energy efficiency, and ability to operate efficiently even in Quebec's bitter cold. This unit, designed to provide stable heating down to -25°C, is ideal for buildings in Greater Montreal where harsh winters put HVAC equipment to the test.
In addition, Fujitsu offers several Energy Star certified models, which makes this installation eligible for grant programs available in Quebec, particularly for residents of Montreal, Laval, Longueuil, as well as the North and South Shores.
The technical challenges of a flat roof installation
Galvanized steel raised support
In this installation, the outdoor unit was placed on a raised galvanized steel support , ensuring stability and preventing any obstruction due to accumulated snow. This choice also ensures a longer lifespan for the unit, by reducing the risk of corrosion.
Winter conditions management
As the situation shows, the roof was already covered in snow at the time of the work. Our technicians took care of:
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clear the installation area to ensure adequate ventilation,
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check condensate drains to prevent ice buildup,
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install reinforced insulation of refrigerant pipes exposed to the cold.
Wiring and electrical box
The electrical connection was made with a protective box suitable for outdoor conditions . The cables were carefully sheathed to withstand temperature variations, ensuring safety and reliability.
Benefits for the customer
With this installation, the customer now benefits from:
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Four-season comfort : efficient heating in winter and effective air conditioning in summer.
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Energy savings thanks to Fujitsu high energy efficiency.
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A sustainable system protected against the harshness of Montreal winters.
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Access to grants available for improving the energy efficiency of buildings.
AirGreen expertise in Montreal and Greater Montreal
Each flat roof installation requires specific expertise. At AirGreen, we know how to tailor our services to the building type, technical constraints, and the occupants' energy needs. Our team handles the entire process: from selecting the right heat pump model to commissioning and maintenance.
Whether in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we guarantee safe, efficient installations that comply with current standards.
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).