A Smart HVAC Solution in Ville-Marie: Installation of a SHARP BU DoubleZone Wall-Mounted Heat Pump by AirGreen
Installation of a SHARP BU DoubleZone wall-mounted heat pump in Ville-Marie by AirGreen. A high-performance, whisper-quiet multi-zone solution with Plasmacluster air purification 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 seamless and efficient wall-mounted heat pump installation in a tight space
At AirGreen, we specialize in installing HVAC systems (heating, ventilation, and air conditioning) that are not only efficient and high-performing, but also visually discreet and tailored to each home’s architectural reality. Today, we’re showcasing a project completed in the Ville-Marie neighbourhood of Montréal, featuring a SHARP BU DoubleZone wall-mounted heat pump, a high-performance model certified for harsh Canadian climates.
The goal of this installation was to deliver a multi-room heating and cooling solution, while maintaining exceptional energy efficiency and visual discretion. Thanks to our team’s expertise and the strategic selection of the SHARP BU series, we were able to provide our client with tailor-made thermal comfort, all year round.
Why the SHARP BU DoubleZone Wall-Mounted Heat Pump?
The SHARP BU series strikes the perfect balance between cutting-edge Japanese technology, sleek design, and extreme cold weather performance. It’s designed to serve two to three separate zones with a single outdoor unit, making it an ideal choice for condos, duplexes, or urban homes like those found in downtown Montréal.
Some of the key advantages of the BU model:
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Exclusive Plasmacluster technology: actively purifies indoor air by neutralizing viruses, bacteria, allergens, and mold.
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Maximum heating performance down to -27 °C thanks to the patented "Hot Gas Pipe" system.
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R32 refrigerant: an eco-friendly, energy-efficient, and environmentally responsible choice.
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Ultra-low noise level, making it perfect for bedrooms, offices, and other quiet zones.
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Built-in Wi-Fi with Google Assistant and Alexa compatibility for smart comfort management.
Technical details of the installed SHARP BU heat pump
Here are the specs for the BU DoubleZone model installed in this home:
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Indoor units: AY-XPC9BU and AY-XPC12BU
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Outdoor unit: AE-X3M24BU (AHRI certified #213927543)
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Cooling capacity: Up to 24,000 BTU/h
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Heating capacity: Up to 26,000 BTU/h
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SEER: 25 (very high energy efficiency)
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HSPF: 12 (high-performance heating)
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Temperature range: Operates down to -27 °C in heating mode
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Airflow rate: Up to 752 CFM
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Indoor sound level: As low as 23 dB(A)
These specs make the BU model a top-tier choice for anyone seeking a high-performance, multi-zone solution that’s durable and discreet.
Installation process in Ville-Marie
This project was completed in a typical Ville-Marie condo, where wall space is limited, and every inch matters. Here’s a breakdown of the key steps our team followed:
1. Assessment and planning
First, we performed a full assessment of the client’s needs and the building’s layout. Choosing a DoubleZone system allowed us to cover the most important areas — the living room and the master bedroom — without installing multiple outdoor units.
2. Strategic wall-mounted placement
The unit shown in the photo was strategically installed above a patio door, in a discreet yet central location. This setup ensures optimal airflow circulation, while maintaining a clean and elegant look.
3. Precise, high-quality workmanship
The wall unit was securely mounted with an anti-vibration anchor system. The refrigerant lines were carefully routed to the outdoor unit, which was installed on an anti-vibration base in the backyard. All R32 refrigerant piping was insulated and protected according to the strictest standards.
4. Wi-Fi system setup
We guided the client through the Wi-Fi connection process, enabling full remote control via the SHARP mobile app. The system also offers automated alerts and smart programming tailored to the family’s schedule.
5. System testing and client walkthrough
All functions (heating, cooling, air purification, airflow control) were fully tested, and the client received a personalized tutorial to make the most of their new SHARP heat pump’s advanced features.
What this project showcases about AirGreen’s expertise
Every installation is unique. This project highlights our ability to:
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Maximize heat pump efficiency in a constrained urban environment.
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Adapt solutions to architectural constraints and client comfort requirements.
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Integrate high-end technologies like the BU series with Plasmacluster and smart Wi-Fi controls.
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Deliver a full-service experience: diagnosis, installation, configuration, tutorial, and follow-up.
At AirGreen, we believe thermal comfort and air quality go hand-in-hand. With systems like the SHARP BU DoubleZone, we provide clients with efficient, durable, and healthy solutions.
Eligibility for energy rebates
Good news: this installation is eligible for Hydro-Québec’s LogisVert rebate program. The BU series is Energy Star certified and provides optimal cold-weather performance, meeting the energy efficiency requirements for HVAC rebates in Québec.
Our advisors are here to help you navigate the application process and secure financial assistance of up to $2,500, depending on your situation.
Practical tips for owners of wall-mounted heat pumps
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Regular maintenance: Clean filters monthly and have the unit checked by a pro annually.
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Watch for unusual sounds: Vibrations may indicate loose anchors or imbalances.
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Use energy-saving mode to reduce costs while staying comfortable.
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Take advantage of Plasmacluster: Activate air purification regularly for healthier indoor air.
AirGreen: Your HVAC partner for Montréal, Laval, Longueuil, North Shore and South Shore
Whether you're in Ville-Marie, Old Montréal, the Plateau, Laval, Longueuil, the North Shore, or the South Shore, our experts are here to deliver tailored, long-lasting, high-performance solutions.
Every AirGreen installation is completed with care, precision, and an unwavering commitment to quality.
Trust AirGreen for your heating and cooling projects.
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.
What the unit delivers when it is cold
The range as published on airgreen.ca: pick a size to see its capacity in deep cold.
| Size | Heating at −8 °C | Heating at −15 °C | Coldest certified point | COP at −15 °C | SEER | HSPF | Indicative LogisVert aid |
|---|---|---|---|---|---|---|---|
| Sharp BU 24 0002 Zones (Dual Zone) | 25,000 | 21,200 | −27 °C: 14,600 | 2.3 | 24.0 | 11.5 | $3,000 |
| Sharp BU 24 0003 Zones (Triple Zone) | 25,000 | 21,200 | −27 °C: 14,600 | 2.3 | 24.0 | 11.5 | $3,000 |
Among the year’s most efficient according to ENERGY STAR, on top of its cold-climate certification.
Minimum certified capacity (NEEP): it slows down instead of stopping when a single room calls.
NEEP still lists 14,600 BTU/h at a COP of 1.84 at −17 °F.
Global warming potential of R-32, versus 2,088 for R-410A (ENERGY STAR).
Among the year’s most efficient according to ENERGY STAR, on top of its cold-climate certification.
Minimum certified capacity (NEEP): it slows down instead of stopping when a single room calls.
NEEP still lists 14,600 BTU/h at a COP of 1.84 at −17 °F.
Global warming potential of R-32, versus 2,088 for R-410A (ENERGY STAR).
Data read live from the airgreen.ca page of each size (NEEP / AHRI certified performance). When the title names the installed size, it is highlighted; otherwise the whole range is shown. The aid shown is today’s, using Hydro-Québec’s rule ($120 per 1,000 BTU/h at −8 °C); amounts quoted in the article date from its publication. Only Hydro-Québec confirms the assistance granted.
And at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Baseboards and electric furnaces turn 1 kWh of electricity into 1 kWh of heat. A heat pump delivers more: that is its COP. At Hydro-Québec’s rate D (11.142¢/kWh above 40 kWh a day, since 1 April 2026):
Hydro-Québec: a heat pump can be up to three times more efficient than baseboards for heating in the colder months.
Estimate per kWh of heat, at the chosen temperature, using the certified COP from the product page. Taxes, access charge and backup heat not included.
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.
Which type of equipment for your project?
Pick what looks like your need.
Four mistakes we do not make
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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?
No question matches. Write to us: we answer.
Useful pages for what comes next
More jobs to see, near you
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Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Tell us about your house. We come and see it for free.
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).