Installation of a FUJITSU ORION XLTH 15,000 BTU wall-mounted heat pump in Sainte-Thérèse
AirGreen installs a FUJITSU ORION XLTH 15,000 BTU wall-mounted heat pump in Sainte-Thérèse: comfort, efficient heating, careful installation, and HVAC expertise on the North 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 Precise Wall-Mounted Installation in a Cozy Space, with a Highly Visible Integration Challenge
In Sainte-Thérèse, our AirGreen team recently installed a 15,000 BTU FUJITSU ORION XLTH wall-mounted heat pump, a mini-split system designed to provide excellent comfort for both heating and cooling, even when winter temperatures become demanding on the North Shore.
This project was particularly interesting due to the chosen location: a room with a strong character, featuring a brick fireplace, a relatively low ceiling, a window directly beneath the indoor unit, and wall finishes where every visual detail matters. In this type of environment, a successful HVAC installation isn't just about putting in a high-performance machine. It also requires respecting the room's aesthetic, optimizing air distribution, preserving existing materials, and ensuring a clean finish.
The Fujitsu ORION XLTH wall-mounted heat pump installed here perfectly met the client's needs: replacing or adding a reliable, quiet heating and cooling solution suitable for a main living area, without compromising the room's appearance.
Why the 15,000 BTU FUJITSU ORION XLTH was a perfect fit for this Sainte-Thérèse residence
The FUJITSU ORION XLTH range is highly valued in the Montreal, Laval, Longueuil, North Shore, and South Shore regions for its ability to maintain stable comfort during severe cold. The 15,000 BTU model is an excellent choice for a medium to large living area, especially when one wants to combine performance, quiet operation, and energy efficiency.
In this Sainte-Thérèse residence, the client primarily sought three things:
- reliable heating during winter;
- efficient cooling during warm periods;
- a clean, discreet, and well-integrated installation into the interior decor.
The 15,000 BTU capacity allows for better coverage of a main room than an undersized model, while avoiding the common problems of an oversized unit: short cycles, discomfort, poorly controlled humidity, and less stable performance.
A wall-mounted unit installed above a window: mandatory precision
The image of this installation clearly shows the particularity of the project: the indoor unit was positioned above a window, near a brick wall and a fireplace. This type of configuration requires meticulous analysis before drilling, mounting, and connecting the device.
Our technicians had to consider several elements:
- the available height between the top of the window and the ceiling;
- the necessary space for future unit maintenance;
- the air flow direction to avoid a direct and uncomfortable sensation;
- the proximity of the fireplace and the brick wall;
- the visual alignment of the unit with the room's lines;
- the routing of refrigerant lines, drain, and wiring to the outside.
In a wall-mounted heat pump installation, the positioning of the indoor unit directly influences comfort. A poorly placed machine can create cold spots, blow directly on occupants, or hinder natural air circulation. Here, installation above the window allows for good air projection into the room while maintaining a relatively discreet visual presence.
Clean Integration Near a Brick Fireplace
The proximity of a fireplace adds an extra constraint. Even if the unit is not installed directly on the brick, the immediate environment requires special attention. Brick surfaces, fireplace mantels, and decorative elements can limit routing options or make aesthetic corrections more noticeable.
At AirGreen, we place great importance on the finish. In this project in Sainte-Thérèse, the objective was clear: to achieve a solid, functional, and visually balanced installation. The FUJITSU unit was installed straight, centered in relation to the available space, and high enough to allow for good air diffusion.
Technical Advantages of the FUJITSU ORION XLTH
The FUJITSU ORION XLTH 15,000 BTU is a wall-mounted heat pump designed for cold climates. Its main advantage is its ability to maintain significant performance when the outside temperature drops sharply, which is essential in a region like Sainte-Thérèse, where winter can be long and harsh.
Among the appreciated features of this type of system, we generally find:
- excellent heating performance in cold weather;
- quiet operation;
- capacity modulation thanks to inverter technology;
- efficient air conditioning in summer;
- better temperature stability than a traditional on/off system;
- optimized energy consumption when the installation is properly sized.
Inverter technology allows the heat pump to adjust its power according to actual demand. Instead of constantly operating at full capacity, the unit modulates its output to maintain a more stable temperature. This improves comfort and can reduce unpleasant temperature variations in the room.
The Importance of Correct Sizing: Why 15,000 BTU and Not Automatically 12,000 or 18,000 BTU
One of the most important aspects of an HVAC installation is the choice of capacity. Many homeowners believe that a larger unit is automatically better. In reality, an oversized unit can cause several problems:
- too frequent starts and stops;
- less effective dehumidification in cooling mode;
- thermal discomfort;
- premature wear of certain components;
- actual performance below expectations.
Conversely, an undersized unit risks constantly operating at high intensity, without achieving the desired comfort on very cold or very hot days.
In this specific case, the FUJITSU ORION XLTH 15,000 BTU offered a good balance for the target room. The choice of an XLTH model was also relevant for a homeowner seeking a true heating solution, and not just an air conditioner used occasionally in the summer.
Installation process by AirGreen
For this project in Sainte-Thérèse, our team followed a rigorous method to ensure the durability of the installation.
1. Validation of the interior location
Before any intervention, we confirmed that the space above the window allowed for safe installation and compliance with the necessary clearances. This step is essential, especially when a unit is installed near the ceiling.
It was also necessary to ensure that the unit would not block natural light, interfere with blind operation, or create too heavy a visual effect in the room.
2. Preparation of line routing
Refrigerant lines, communication cable, and drain must be routed cleanly between the indoor and outdoor units. Improper drain slope or routing can lead to drainage problems, vibrations, or more costly future repairs.
Our technicians prepared the routing, limiting the impact on finished walls, while maintaining an efficient path to the outside.
3. Wall unit mounting
The mounting plate was installed precisely so that the unit was perfectly straight. This detail seems simple, but it is crucial. A slightly tilted unit can create drainage problems or give a sloppy appearance.
In a room like this, with a window, moldings, and a brick wall nearby, even the slightest misalignment quickly becomes visible.
4. Refrigerant and electrical connections
The connections were made according to proper HVAC practices, with particular attention to the sealing of the refrigeration circuit. Correct installation reduces the risk of leaks, protects the compressor, and ensures the heat pump's performance.
5. Start-up and checks
Once the installation was complete, we performed functional tests. This step includes checking heating, cooling, drainage, noise, vibrations, and the unit's response to commands.
Mistakes to Avoid When Installing a Wall-Mounted Heat Pump in Sainte-Thérèse
This project clearly illustrates some common mistakes that homeowners should avoid.
Installing the unit too close to the ceiling
A wall-mounted unit needs sufficient clearance to draw in air properly. If it's too close to the ceiling, performance can decrease and maintenance becomes more difficult.
Choosing the location based solely on appearance
Aesthetics are important, but they should not compromise performance. The unit must be placed where air circulates well, where the drain can function correctly, and where connections can be made neatly.
Underestimating the importance of the drain
A poorly installed drain can cause water leaks indoors. In a finished room, this can damage walls, moldings, or flooring. This is why AirGreen pays particular attention to the slope and path of the drain.
Choosing a device without considering the Quebec winter
In Montreal, Laval, Longueuil, on the North Shore, and South Shore, a heat pump must be chosen according to the realities of the local climate. A model adapted to milder climates does not necessarily offer the same comfort in January or February.
Enhanced comfort without transforming the room's appearance
The final result is understated, clean, and functional. The FUJITSU unit integrates well above the window, without dominating the room. The choice of a white wall-mounted model maintains a discreet appearance on a light-colored wall, while its placement avoids encroaching on the living space.
For the client, the advantage is immediate: an efficient heating and cooling solution, installed in a strategic area, with a finish that respects the character of the home.
Subsidies and Eligibility: A Point to Check Depending on the Exact Model
High-performance wall-mounted heat pumps may sometimes be eligible for subsidy programs like Hydro-Québec's LogisVert, depending on the exact model, installed configuration, certified performance, and the conditions in effect at the time of purchase.
For a FUJITSU ORION XLTH heat pump, it is always recommended to verify eligibility with the complete model number, as programs may be updated. At AirGreen, we regularly help our clients understand the applicable criteria and choose a system that combines comfort, performance, and potential financial aid when available.
Why choose AirGreen for an HVAC installation on the North Shore
A wall-mounted heat pump installation should never be treated as a simple device setup. Its actual performance depends as much on the quality of the machine as on the quality of the installation.
At AirGreen, we regularly operate in Sainte-Thérèse, Blainville, Boisbriand, Rosemère, Laval, Montreal, Longueuil, on the North Shore, and the South Shore. This local experience allows us to better understand building types, electrical constraints, aesthetic requirements, and the expectations of Quebec homeowners.
Our approach is based on concrete elements:
- choosing the right location;
- thoughtful sizing;
- clean and durable installation;
- respect for existing materials;
- clear explanations to the client;
- complete verification before project completion;
- after-installation service available for HVAC maintenance and follow-up.
An installation that highlights the importance of details
This FUJITSU ORION XLTH 15,000 BTU wall-mounted heat pump installation in Sainte-Thérèse demonstrates that a good HVAC project is not limited to the performance stated on a technical data sheet. It also requires careful reading of the space, clean execution, and a true understanding of daily comfort.
The wall-mounted unit had to be installed in a visible area, above a window, next to a brick fireplace, in a room where appearance matters as much as performance. Thanks to careful installation and the right equipment choice, the client now benefits from a reliable, discreet, and efficient system to face the North Shore winters and the summer heat of Greater Montreal.
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).