Wall-Mounted SHARP Dual-Zone Heat Pump Installed in a Cathedral Stairwell in Laval
Installation of a SHARP BU Dual-Zone wall-mounted heat pump in Laval, inside a cathedral-style stairwell. Exceptional comfort, air purification, sleek design, and reliable performance down to -27°C thanks to Plasmacluster technology.
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 powerful and elegant HVAC solution for high-ceiling spaces
At AirGreen, we recently completed the installation of a SHARP Dual-Zone wall-mounted heat pump (BU model) in a home located in Laval, specifically in a cathedral-style stairwell. This type of setting often presents unique challenges in terms of air circulation and thermal comfort. Thanks to our expertise in HVAC installation in Laval, we were able to provide our client with a highly efficient and aesthetically integrated solution.
A complex environment: cathedral-style stairwell
Cathedral stairwells present a vertical configuration that makes air distribution more difficult, especially during extreme heat or cold. The choice of the SHARP BU Dual-Zone wall-mounted heat pump proved to be a strategic one for meeting these specific demands.
Equipped with Plasmacluster technology, this unit not only cools or heats large volumes of air quickly, but also purifies the ambient air by eliminating viruses, bacteria, mold, and allergens through a patented system of positive and negative ions.
Technical features of the SHARP BU wall-mounted heat pump installed
The BU model used for this installation is a dual-zone unit, connected to an AE-X3M24BU outdoor unit. Here are some relevant specs:
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Cooling capacity: up to 27,000 BTU/h
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Heating capacity: up to 30,000 BTU/h
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Performance at -27°C: up to 14,600 BTU/h (certified extreme cold heating)
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Energy efficiency: SEER 24 / EER 14 / HSPF up to 12
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Eco-friendly refrigerant: R-32, with low global warming potential
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Sound level: as low as 23 dB(A) in silent mode
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Coanda airflow: allows smooth and even circulation
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Built-in Wi-Fi for smart remote control
Specific advantages for this installation in Laval
Uniform air distribution in a large-volume space
SHARP’s “Multi Space” system enables continuous and intelligent ventilation, ideal for open and high-ceiling spaces like stairwells. The airflow reach of up to 50 feet ensures complete coverage, from ceiling to ground level.
No direct airflow on occupants
Thanks to the Coanda effect, cold air in summer and warm air in winter is redirected along surfaces, avoiding discomfort from direct air blasts.
Discreet and elegant design
The indoor unit blends seamlessly into the décor. Strategically positioned above the stairwell, it respects the home’s aesthetics while ensuring optimal comfort. It’s a prime example of a high-performance and visually pleasing HVAC solution.
Challenges encountered during installation
Complex height access
Installed over three meters off the ground in a stairwell, the setup required the use of secure scaffolding and precise access methods. Our certified technicians followed strict safety protocols to ensure a flawless installation.
Management of refrigerant line lengths
Since it’s a dual-zone system, we carefully planned the routing of the refrigerant lines to minimize energy loss while respecting the home’s architectural layout.
Invisible electrical integration
Special attention was given to concealing power cables, keeping them hidden within the walls. All wiring complies with Quebec’s electrical code.
Warranty and peace of mind
This installation is covered by a 10-year warranty on the compressor, 10 years on parts, and 10 years on labor, offered by SHARP (conditions apply). Such comprehensive coverage is rare in the market and demonstrates the quality of SHARP products and AirGreen’s confidence in its installations.
Why choose AirGreen for your HVAC needs in Laval?
For several years, we’ve served Laval with heating, air conditioning, and air purification solutions tailored to Quebec’s climate. Our certified technicians evaluate every project thoroughly and install only dependable, energy-efficient systems.
We stand out thanks to:
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Advanced technical expertise in wall-mounted and central heat pumps
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Personalized customer service throughout the entire project
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In-depth knowledge of available government grants
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Clean, fast, and guaranteed installations
A SHARP dual-zone heat pump in Laval: the right choice
This Laval project demonstrates the advantage of combining Japanese technology, thermal comfort, and air purification into a single heat pump system. Thanks to the SHARP BU Dual-Zone wall-mounted heat pump, our client now enjoys year-round comfort, even in a hard-to-regulate space.
For all your heat pump projects in Laval, Montreal, Longueuil, the North Shore or South Shore, trust AirGreen — experts who understand your needs and deliver results that exceed expectations.
How it goes, from the first call to the end
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.
And 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.
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.
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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?
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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).