Installation of a Fujitsu wall-mounted heat pump in Richelieu on a wall with limited clearance
In Richelieu, AirGreen installed a Fujitsu wall-mounted heat pump beneath a soffit with limited clearance: an HVAC project where positioning, drainage, and airflow required great precision.
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 Fujitsu installation in Richelieu where a few centimetres made all the difference
At Richelieu, on the South Shore of Montreal, we completed an installation that clearly illustrates a reality of the HVAC trade: even when a Fujitsu wall-mounted heat pump seems relatively simple to install, the actual configuration of the room can turn positioning the indoor unit into an exercise in precision.
In the photo of this installation, one detail quickly stands out: the Fujitsu wall-mounted unit had to be installed in a particularly constrained section of wall, immediately below a ceiling soffit and very close to a corner. It was therefore not simply a matter of centring the heat pump on a large, unobstructed wall. We had to find a location that would provide good air distribution, reasonable access for maintenance and a clean visual integration, without compromising the unit’s operation.
This is exactly the kind of situation we regularly encounter at AirGreen during our installations of wall-mounted heat pumps in Richelieu, Montreal, Laval, Longueuil, the North Shore and the South Shore.
A Fujitsu heat pump installed in an unusual architectural space
The room presented a significant constraint: a wide horizontal soffit extended across the upper part of the wall. This structure reduced the height actually available for installing the evaporator.
The Fujitsu indoor unit was therefore positioned:
- below the existing soffit;
- near the side wall;
- high enough to promote proper air distribution;
- while maintaining the necessary clearances around the unit;
- with precise alignment so that the installation remains visually clean.
This type of situation is much more challenging than a completely unobstructed wall. An error of just a few centimetres can lead to an unattractive result, make it more difficult to open the front panel, or interfere with future HVAC maintenance work.
Why the indoor unit’s positioning is so important
A wall-mounted heat pump works by circulating a significant amount of air throughout the room. Air is drawn in by the indoor unit, treated by the heat exchanger, and then redistributed through the louvers located in the lower section.
The location therefore directly influences:
- the reach of the airflow;
- temperature uniformity;
- the perceived noise level;
- the accessibility of the filters;
- the ease of cleaning the evaporator;
- the comfort experienced in the different areas of the room.
For this installation in Richelieu, our objective was specifically to prevent a structure located immediately above the appliance from becoming an obstacle to its operation or maintenance.
The result is a Fujitsu unit installed very cleanly in a space that, at first glance, offered relatively few possibilities.
A detail visible in the photo: precise alignment
When we look at this completed installation, the unit is perfectly level and naturally follows the geometry of the wall.
This may seem basic, but a wall-mounted unit that is not properly level can cause several problems. Condensate drainage, in particular, must be taken seriously. In cooling mode, moisture in the air condenses on the evaporator. This water must then be properly directed to the drain.
Improper positioning or an inadequate drainage slope can contribute to:
- water leaks;
- odors;
- water accumulating in the drain pan;
- dripping sounds;
- damage to the wall or floor.
With every Fujitsu heat pump installation, we therefore look beyond the unit’s exterior appearance. The plate alignment, piping route, drain, and connections must all work together.
Fujitsu: a brand particularly well suited to heating Quebec homes
Fujitsu has long held an important position in the heat pump market in Quebec, notably thanks to its product lines designed to provide heating in low temperatures.
Depending on the series and capacity selected, different Fujitsu heat pumps can offer particularly impressive winter performance. Some recent models designed for cold climates continue to produce heat at temperatures well below freezing.
For a home located in Richelieu or elsewhere on the South Shore, this aspect is essential. A heat pump should not be evaluated solely according to its nominal BTU capacity. We also analyze:
- its heating capacity when the outdoor temperature drops;
- its seasonal efficiency;
- its electricity consumption;
- its sound level;
- compressor modulation;
- the dimensions of the indoor unit;
- the capacity that is actually suited to the property.
Since the exact model of this Fujitsu unit is not legible in the photo, we prefer not to artificially assign a precise capacity or efficiency rating to this appliance. At AirGreen, we believe that technical information must correspond to the model number of the unit actually installed, rather than simply to the machine’s external appearance.
Choosing the right BTU capacity: bigger is not necessarily better
When a homeowner shops for a wall-mounted heat pump in Richelieu, one of the first questions often concerns capacity: 9,000, 12,000, 15,000, 18,000, or 24,000 BTUs?
The right answer depends on the building.
An oversized heat pump can quickly reach the set temperature, then greatly reduce its output or stop its cycle. Conversely, an undersized unit may have to operate almost constantly during more demanding periods.
We consider the floor area, among other factors, but also:
Insulation
Two properties with the same floor area can have very different heating and cooling needs if one has newer walls, good windows, and excellent insulation, while the other has greater heat loss.
Room layout
A wall-mounted heat pump heats the area where it is installed very efficiently. However, air must be able to circulate to adjacent spaces.
A long corridor, closed-off bedrooms, or multiple floors can therefore significantly alter the installation strategy.
Windows and solar exposure
A large south-facing glazed area can create a significant cooling load during the summer.
Existing heating
In some homes, the heat pump becomes the primary source of heating for much of the winter, while electric baseboards or another system remain available as supplemental heat.
That is why we avoid sizing a heat pump solely according to an approximate formula based on the number of square feet.
The specific challenge of ceiling beams and soffits
This Fujitsu installation in Richelieu also provides an interesting example for owners of older homes, finished basements, and dwellings with ceilings at varying heights.
A soffit can conceal a beam, plumbing, ventilation, or other structural elements. Drilling without understanding what is behind it can quickly complicate the job.
Before permanently fastening a unit, our installers assess, among other things:
- the wall material;
- the ability to securely fasten the mounting plate;
- the potential path of the refrigerant lines;
- the communication wire route;
- condensate drainage;
- the planned outdoor location for the condenser;
- invisible or likely obstacles.
This preparation helps avoid improvisation after the wall is opened.
A wall-mounted installation must also remain serviceable
Choosing an extremely tight location can sometimes seem appealing because it allows the heat pump to be concealed more effectively. However, it is important to consider what will happen in three, five, or ten years.
An indoor unit will eventually need to be cleaned.
The filters must be easy to remove. During a deep cleaning of a wall-mounted heat pump, the technician must also have access to the heat exchanger, blower wheel, and condensate pan.
We must therefore reconcile two sometimes conflicting objectives: make maximum use of the available space without trapping the machine in a location that is impossible to maintain.
The photo of our installation in Richelieu shows this compromise precisely: the unit fits beneath the existing structure while remaining accessible from the front and underneath.
What this Richelieu installation can teach homeowners planning their own project
A successful HVAC installation depends not only on the heat pump’s brand. The equipment may be excellent and still deliver disappointing results if it is poorly positioned, incorrectly sized, or installed without considering airflow.
Do not choose the location solely to hide the unit
We fully understand why some homeowners want to make their indoor unit as discreet as possible. However, technical criteria must remain the priority.
In particular, avoid locations where the airflow would be directly blocked by:
- a beam;
- a tall cabinet;
- a bookcase;
- curtains;
- a room divider;
- a piece of furniture installed too close.
In several AirGreen projects in Montreal and on the South Shore, moving the unit by just 30 to 60 cm allowed us to achieve significantly better air distribution without compromising the appearance of the room.
Consider the piping route before choosing the wall
The best indoor location must also be compatible with the route to the outdoor unit.
A wall-mounted heat pump typically requires:
- two refrigerant lines;
- a communication or power cable, depending on the configuration;
- a condensate drain;
- a passage through the building envelope.
A very attractive indoor location can become costly or technically impractical if the piping has to travel a long distance around the house.
Our job is therefore to look at the complete system, not just the visible indoor unit in the room.
Finishing is part of the installation
On a wall-mounted unit like this Fujitsu installed in Richelieu, the details are extremely visible. The unit is located directly in the living space, often at eye level.
A professional installation requires particular attention to:
- levelness;
- the cleanliness of the drilled opening;
- the positioning of the mounting plate;
- the finish around the openings;
- the arrangement of the lines;
- the unit’s fastening and stability.
We place great importance on these details because a heat pump is generally installed for many years.
Rebates: verify the exact AHRI number before making a decision
Certain cold-climate Fujitsu heat pumps may qualify for financial assistance when they meet the program criteria applicable at the time of installation.
The mistake to avoid is assuming that all heat pumps from the same brand automatically qualify for the same subsidy.
Eligibility generally depends on the exact combination of the indoor unit and outdoor unit, as well as its certification. The AHRI number is therefore much more important than the simple Fujitsu logo displayed on the unit.
Before recommending a system, we can verify the exact combination and explain the relevant programs available in Quebec at the time of the project.
Why many South Shore homeowners choose a wall-mounted heat pump
In areas such as Richelieu, Chambly, Carignan, Saint-Jean-sur-Richelieu, Brossard, Saint-Hubert and Longueuil, wall-mounted heat pumps are an especially appealing solution when the home does not have a central duct network.
They make it possible to combine heating and air conditioning in a single system and generally offer excellent energy efficiency thanks to the variable-speed compressor.
A good modern heat pump can modulate its output rather than operating continuously at full capacity. This promotes a more stable temperature and avoids the sudden fluctuations typical of some conventional systems.
A project that shows why the technical assessment remains important
A photo like this one of the installation in Richelieu helps explain why we place so much importance on analyzing the site before the work begins.
On paper, the project could simply be described as “installation of a Fujitsu wall-mounted heat pump.”
On site, the circumstances included a dropped ceiling, a very close side wall, limited available height and the need to maintain a clean, functional installation.
This is precisely where the installers’ experience becomes important.
At AirGreen, our teams install Fujitsu wall-mounted heat pumps and other HVAC systems throughout Greater Montreal, including Montreal, Laval, Longueuil, the North Shore and the South Shore. Each project is assessed according to the building, the desired comfort level and the actual constraints present on site.
This installation in Richelieu is a good example: a compact unit placed in an unconventional space, with particular attention paid to alignment, clearance, airflow and integration into the room.
For a homeowner considering a wall-mounted heat pump installation, this preparation is often what makes the difference between a unit simply attached to the wall and a system truly adapted to the home.
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).