Installation of a Sharp wall-mounted heat pump in a loft in Southwest Montreal
In this bright loft in southwest Montreal, our AirGreen team installed a Sharp wall-mounted heat pump high above the stairwell. This discreet and efficient solution now provides year-round comfort, improved air circulation, and energy savings for the homeowner.
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.
In this lovely high-ceilinged loft in Southwest Montreal, our team was called in to solve a very real challenge: how to efficiently heat and cool a high-ceilinged space above a stairwell without compromising the aesthetics of the place or the flow of traffic?
Our solution: the installation of a new-generationSharp wall-mounted heat pump , strategically positioned high on the main wall overlooking the staircase. The result: consistent comfort in both summer and winter, controlled energy consumption, and a clean installation that blends seamlessly into the home's contemporary décor.
The project: a bright loft, but difficult to air-condition.
The accommodation is a two-level loft-style apartment, with:
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A large window overlooking an exterior brick wall, which brings in plenty of light… and heat in the summer.
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An open stairwell connects the ground floor and the upper floor, allowing warm air to rise in winter and warm outside air to flow in during summer.
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An exposed wooden beam ceiling , which adds a lot of character, but complicates the positioning of HVAC equipment a little.
The client wanted:
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A discreet, silent and efficient system.
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A solution capable of managing the temperature variations of Montreal's climate, from -25°C in winter to +30°C and more in summer .
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A clean installation, with the ducts hidden and the least possible visual impact on the main wall and the staircase.
The chosen solution: Sharp wall-mounted heat pump
For this project, we recommended a Sharp wall-mounted heat pump for its excellent performance/reliability/price ratio and its ability to operate in both air conditioning and heating.
Main characteristics of the installed system (typical profile of a recent Sharp wall unit):
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Power adapted to the space : a capacity of approximately 12,000 BTU, ideal for this open-plan volume.
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Inverter technology : the heat pump continuously adjusts its power according to demand, which improves comfort and reduces energy consumption.
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Four-season operation : efficient heating even in the cold weather typical of southwest Montreal.
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Reduced noise level : perfect for a loft where living room, staircase and workspace coexist.
The Sharp brand is already well known in our portfolio of wall-mounted heat pump projects: this system integrates perfectly with the needs of condo, loft and urban apartment owners in Greater Montreal.
Strategic positioning of the internal unit
The Sharp wall unit was installed high on the wall overlooking the stairwell . This choice was not purely aesthetic:
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The air blown at the top of the stairwell naturally descends and spreads throughout the space.
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The central position allows it to cover both the floor and the volume near the stairs , avoiding areas that are too hot at the top and too cool at the bottom.
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The clearance in front of the device is excellent: nothing blocks the airflow (neither nearby walls, nor beams, nor furniture).
The photo shows the wall opening next to the head: this is where we ran the refrigeration lines, the condensation drain and the power supply , all to reach the outdoor unit on the brick side, in the most direct way possible.
Installation details: cleanliness, safety and performance
Installation in a stairwell requires special attention:
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Working height : we used a secure stepladder and took all necessary precautions to work safely above the stairs.
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Precise drilling of the wall : the technical hole was carefully made to limit the opening, maintain the insulation and prevent air infiltration.
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Condensation drain management : the drain was installed with an adequate slope to evacuate water to the outside or to a suitable drainage point, without risk of drips or moisture on the wall.
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Refrigerant line routing : The refrigerant pipes were carefully insulated and concealed, then connected to the outdoor unit according to manufacturer's standards and building code.
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Preparation for finishing : the visible wall opening will be closed and repaired neatly (jointing, plastering, painting) for an almost invisible integration.
As always, we proceed to:
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A rigorous vacuuming of the refrigeration lines.
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A leak test to ensure there are no refrigerant leaks.
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A complete start-up of the heat pump with measurements taken (temperature, pressure, current) to validate that the Sharp device is operating within the recommended parameters.
Four-season comfort in a Southwest loft
Thanks to this Sharp wall-mounted heat pump, the customer now benefits from:
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Effective air conditioning in the summer , even during heat waves when the large window exposed to the sun caused the temperature to rise rapidly.
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Efficient heating during the shoulder seasons and in winter , which reduces the load on other heating systems and lowers the energy bill.
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With consistent comfort between the bottom and top of the stairwell, whereas previously the heat stagnated at the ceiling and the ground floor remained cooler.
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With quiet operation , ideal for working, relaxing or entertaining, without unpleasant background noise.
The heat pump thus becomes the main comfort solution in this urban loft, while offering significant energy savings compared to a traditional air conditioner and electric baseboard heaters alone.
An installation that respects the aesthetics of the place
The owner was very keen to preserve the character of the exposed wood, the glass railing, and the clean lines of the walls . Therefore, we have:
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Align the Sharp wall unit harmoniously with the wall and the stairwell.
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The length of exposed cable trays is limited as much as possible, with preference given to routing them inside the wall.
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Planned a clean wall finish (drywall repair, uniform painting) so that the installation blends into the decor.
The end result: discreet, contemporary equipment, perfectly suited to the style of the loft.
AirGreen: Your HVAC partner in the Southwest and throughout Greater Montreal
At AirGreen, we regularly install Sharp wall-mounted heat pumps in condos, lofts, single-family homes and plexes in Montreal, on the South Shore, the North Shore and in Laval.
For each project, we:
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Let's analyze the volume to be air-conditioned , the orientation, the ceiling height and the insulation.
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We recommend the appropriate capacity and model based on your specific situation.
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Let's plan the routing of the conduits to minimize the visual impact.
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Let's perform an installation that complies with the manufacturer's standards and the Quebec Building Code .
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We offer a complete after-sales service : maintenance, diagnostics, repair, advice to optimize the use of your heat pump.
Do you have a loft, an open staircase, or a space that is difficult to temperature control?
If, like this customer in Southwest Montreal, you live in a loft with high ceilings , large windows or a stairwell that is difficult to keep comfortable, a Sharp wall-mounted heat pump installed by AirGreen is an ideal solution.
Contact us for a free evaluation of your wall-mounted heat pump project in Greater Montreal. We would be happy to offer you a customized, high-performance solution that integrates seamlessly into your 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.
More jobs to see, near you
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Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
The on-site estimate is free and the quote follows within 24 hours.
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).